{
    "uniprot_canonical_ac": "P0DUB6-1",
    "uniprot_ac": "P0DUB6",
    "uniprot_id": "AMY1A_HUMAN",
    "mass": {
        "chemical_mass": 57768.0,
        "monoisotopic_mass": 57768.0
    },
    "refseq": {
        "ac": "NP_001008219",
        "name": "alpha-amylase 1B precursor",
        "url": "https://www.ncbi.nlm.nih.gov/protein/NP_001008219"
    },
    "gene_names": [
        {
            "name": "AMY1A",
            "resource": "UniProtKB",
            "type": "recommended",
            "url": "https://www.uniprot.org/uniprot/P0DUB6",
            "id": "P0DUB6"
        },
        {
            "name": "AMY1",
            "resource": "UniProtKB",
            "type": "synonym",
            "url": "https://www.uniprot.org/uniprot/P0DUB6",
            "id": "P0DUB6"
        }
    ],
    "protein_names": [
        {
            "name": "Alpha-amylase 1A",
            "resource": "UniProtKB",
            "type": "recommended",
            "url": "",
            "id": "P0DUB6"
        },
        {
            "name": "1,4-alpha-D-glucan glucanohydrolase 1",
            "resource": "UniProtKB",
            "type": "synonym",
            "url": "",
            "id": "P0DUB6"
        },
        {
            "name": "3.2.1.1",
            "resource": "UniProtKB",
            "type": "synonym",
            "url": "",
            "id": "P0DUB6"
        },
        {
            "name": "Salivary alpha-amylase",
            "resource": "UniProtKB",
            "type": "synonym",
            "url": "",
            "id": "P0DUB6"
        },
        {
            "name": "alpha-amylase 1B precursor",
            "resource": "RefSeq",
            "type": "synonym",
            "url": "https://www.ncbi.nlm.nih.gov/protein/NP_001008219",
            "id": "NP_001008219"
        },
        {
            "name": "glycogenase; amylase, salivary, alpha-1B; salivary amylase alpha 1B; alpha-amylase 1; salivary alpha-amylase; 1,4-alpha-D-glucan glucanohydrolase 1; amylase alpha 1B (salivary); alpha-amylase 1A; alpha-amylase 1B",
            "resource": "RefSeq",
            "type": "synonym",
            "url": "https://www.ncbi.nlm.nih.gov/protein/NP_001008219",
            "id": "NP_001008219"
        }
    ],
    "function": [
        {
            "annotation": "Calcium-binding enzyme that initiates starch digestion in the oral cavity (PubMed:12527308). Catalyzes the hydrolysis of internal (1->4)-alpha-D-glucosidic bonds, yielding a mixture of maltose, isomaltose, small amounts of glucose as well as small linear and branched oligosaccharides called dextrins (PubMed:12527308).",
            "evidence": [
                {
                    "database": "UniProtKB",
                    "id": "P0DUB6",
                    "url": "https://www.uniprot.org/uniprot/P0DUB6#function"
                },
                {
                    "database": "PubMed",
                    "id": "12527308",
                    "url": "https://glygen.org/publication/PubMed/12527308"
                }
            ]
        }
    ],
    "disease": [],
    "snv": [
        {
            "evidence": [
                {
                    "id": "rs1570674150",
                    "database": "dbSNP",
                    "url": "https://www.ncbi.nlm.nih.gov/SNP/snp_ref.cgi?type=rs&rs=rs1570674150"
                },
                {
                    "id": "rs1570674150",
                    "database": "ENSEMBL",
                    "url": "https://www.ensembl.org/id/rs1570674150"
                }
            ],
            "glycoeffect": [
                "n-glyco-sequon-loss",
                "o-glyco-site-loss"
            ],
            "start_pos": 429,
            "end_pos": 429,
            "sequence_org": "S",
            "sequence_mut": "N",
            "comment": "Germline mutation passed 1 out of 1 filters: n-glyco-sequon-loss (NGS->NGN).",
            "chr_id": "1",
            "chr_pos": "103662951",
            "ref_nt": "A",
            "alt_nt": "null",
            "minor_allelic_frequency": "",
            "site_lbl": "S429",
            "keywords": [
                "ebi",
                "germline"
            ]
        }
    ],
    "mutagenesis": [],
    "expression_tissue": [],
    "expression_disease": [],
    "species": [
        {
            "name": "Homo sapiens",
            "taxid": 9606,
            "evidence": [
                {
                    "database": "UniProtKB",
                    "id": "P0DUB6",
                    "url": "https://www.uniprot.org/uniprot/P0DUB6"
                }
            ],
            "common_name": "Human"
        }
    ],
    "gene": [
        {
            "name": "AMY1A",
            "url": "https://www.uniprot.org/uniprot/P0DUB6",
            "locus": {
                "chromosome": "1",
                "start_pos": 103664554,
                "end_pos": 103655760,
                "strand": "-",
                "evidence": [
                    {
                        "database": "Ensembl Gene",
                        "id": "ENSG00000237763",
                        "url": "https://www.ensembl.org/id/ENSG00000237763"
                    }
                ]
            }
        }
    ],
    "crossref": [
        {
            "id": "ENSG00000237763",
            "url": "https://bgee.org/?page=gene&gene_id=ENSG00000237763",
            "database": "Bgee",
            "categories": [
                "Gene Expression"
            ]
        },
        {
            "id": "cd11317",
            "url": "https://www.ncbi.nlm.nih.gov/Structure/cdd/cddsrv.cgi?uid=cd11317",
            "database": "CDD",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "CHEMBL2478",
            "url": "https://www.ebi.ac.uk/chembldb/target/inspect/CHEMBL2478",
            "database": "ChEMBL",
            "categories": [
                "Other"
            ]
        },
        {
            "id": "AMY1A",
            "url": "http://www.genecards.org/cgi-bin/carddisp.pl?gene=AMY1A",
            "database": "GeneCards",
            "categories": [
                "Gene Annotation",
                "Organism-specific"
            ]
        },
        {
            "id": "276",
            "url": "https://www.ncbi.nlm.nih.gov/gene/276",
            "database": "GeneID",
            "categories": [
                "Genome Annotation"
            ]
        },
        {
            "id": "277",
            "url": "https://www.ncbi.nlm.nih.gov/gene/277",
            "database": "GeneID",
            "categories": [
                "Genome Annotation"
            ]
        },
        {
            "id": "278",
            "url": "https://www.ncbi.nlm.nih.gov/gene/278",
            "database": "GeneID",
            "categories": [
                "Genome Annotation"
            ]
        },
        {
            "id": "474",
            "url": "https://www.genenames.org/cgi-bin/gene_symbol_report?hgnc_id=474",
            "database": "HGNC",
            "categories": [
                "Organism-specific"
            ]
        },
        {
            "id": "IPR006046",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR006046",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "IPR006047",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR006047",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "IPR006048",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR006048",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "IPR013780",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR013780",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "IPR017853",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR017853",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "IPR031319",
            "url": "https://www.ebi.ac.uk/interpro/entry/IPR031319",
            "database": "InterPro",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "hsa:276",
            "url": "https://www.genome.jp/dbget-bin/get_linkdb?-t+pathway+hsa:276",
            "database": "KEGG Pathway",
            "categories": [
                "Enzyme and Pathway"
            ]
        },
        {
            "id": "hsa:277",
            "url": "https://www.genome.jp/dbget-bin/get_linkdb?-t+pathway+hsa:277",
            "database": "KEGG Pathway",
            "categories": [
                "Enzyme and Pathway"
            ]
        },
        {
            "id": "hsa:278",
            "url": "https://www.genome.jp/dbget-bin/get_linkdb?-t+pathway+hsa:278",
            "database": "KEGG Pathway",
            "categories": [
                "Enzyme and Pathway"
            ]
        },
        {
            "id": "104702",
            "url": "http://www.omim.org/entry/104702",
            "database": "MIM",
            "categories": [
                "Other"
            ]
        },
        {
            "id": "NX_P0DUB6",
            "url": "https://www.nextprot.org/entry/NX_P0DUB6",
            "database": "neXtProt",
            "categories": [
                "Protein",
                "Organism-specific"
            ]
        },
        {
            "id": "TFVDNWD",
            "url": "https://omabrowser.org/oma/group/TFVDNWD/",
            "database": "OMA",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "3249969at2759",
            "url": "http://www.orthodb.org/?query=3249969at2759",
            "database": "OrthoDB",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "PTHR43447",
            "url": "http://www.pantherdb.org/panther/family.do?clsAccession=PTHR43447",
            "database": "PANTHER",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "PTHR43447:SF50",
            "url": "http://www.pantherdb.org/panther/family.do?clsAccession=PTHR43447:SF50",
            "database": "PANTHER",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "1C8Q",
            "url": "https://www.rcsb.org/structure/1C8Q",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1JXJ",
            "url": "https://www.rcsb.org/structure/1JXJ",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1JXK",
            "url": "https://www.rcsb.org/structure/1JXK",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1MFU",
            "url": "https://www.rcsb.org/structure/1MFU",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1MFV",
            "url": "https://www.rcsb.org/structure/1MFV",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1NM9",
            "url": "https://www.rcsb.org/structure/1NM9",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1Q4N",
            "url": "https://www.rcsb.org/structure/1Q4N",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1SMD",
            "url": "https://www.rcsb.org/structure/1SMD",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1XV8",
            "url": "https://www.rcsb.org/structure/1XV8",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "1Z32",
            "url": "https://www.rcsb.org/structure/1Z32",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "3BLK",
            "url": "https://www.rcsb.org/structure/3BLK",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "3BLP",
            "url": "https://www.rcsb.org/structure/3BLP",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "3DHP",
            "url": "https://www.rcsb.org/structure/3DHP",
            "database": "PDB",
            "categories": [
                "3D Structure"
            ]
        },
        {
            "id": "PF00128",
            "url": "http://pfam.xfam.org/family/PF00128",
            "database": "Pfam",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "PF02806",
            "url": "http://pfam.xfam.org/family/PF02806",
            "database": "Pfam",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "PR_P0DUB6",
            "url": "http://purl.obolibrary.org/obo/PR_P0DUB6",
            "database": "PRO",
            "categories": [
                "Protein"
            ]
        },
        {
            "id": "R-HSA-189085",
            "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-189085",
            "database": "Reactome",
            "categories": [
                "Protein Classification"
            ]
        },
        {
            "id": "NP_001008219",
            "url": "https://www.ncbi.nlm.nih.gov/protein/NP_001008219",
            "database": "RefSeq",
            "categories": [
                "Protein"
            ]
        },
        {
            "id": "P0DUB6",
            "url": "https://www.uniprot.org/uniprot/P0DUB6",
            "database": "UniProtKB",
            "categories": [
                "Protein"
            ]
        },
        {
            "id": "P0DUB6-1",
            "url": "https://www.uniprot.org/uniprot/P0DUB6-1",
            "database": "UniProtKB",
            "categories": [
                "Protein"
            ]
        }
    ],
    "sequence": {
        "sequence": "MKLFWLLFTIGFCWAQYSSNTQQGRTSIVHLFEWRWVDIALECERYLAPKGFGGVQVSPPNENVAIHNPFRPWWERYQPVSYKLCTRSGNEDEFRNMVTRCNNVGVRIYVDAVINHMCGNAVSAGTSSTCGSYFNPGSRDFPAVPYSGWDFNDGKCKTGSGDIENYNDATQVRDCRLSGLLDLALGKDYVRSKIAEYMNHLIDIGVAGFRIDASKHMWPGDIKAILDKLHNLNSNWFPEGSKPFIYQEVIDLGGEPIKSSDYFGNGRVTEFKYGAKLGTVIRKWNGEKMSYLKNWGEGWGFMPSDRALVFVDNHDNQRGHGAGGASILTFWDARLYKMAVGFMLAHPYGFTRVMSSYRWPRYFENGKDVNDWVGPPNDNGVTKEVTINPDTTCGNDWVCEHRWRQIRNMVNFRNVVDGQPFTNWYDNGSNQVAFGRGNRGFIVFNNDDWTFSLTLQTGLPAGTYCDVISGDKINGNCTGIKIYVSDDGKAHFSISNSAEDPFIAIHAESKL",
        "length": 511,
        "header": "sp|P0DUB6-1|AMY1A_HUMAN Isoform 1 of Alpha-amylase 1A  OS=Homo sapiens OX=9606 GN=AMY1A PE=1 SV=1 CANONICAL=P0DUB6-1"
    },
    "isoforms": [
        {
            "isoform_ac": "P0DUB6-1",
            "url": "",
            "sequence": {
                "sequence": "MKLFWLLFTIGFCWAQYSSNTQQGRTSIVHLFEWRWVDIALECERYLAPKGFGGVQVSPPNENVAIHNPFRPWWERYQPVSYKLCTRSGNEDEFRNMVTRCNNVGVRIYVDAVINHMCGNAVSAGTSSTCGSYFNPGSRDFPAVPYSGWDFNDGKCKTGSGDIENYNDATQVRDCRLSGLLDLALGKDYVRSKIAEYMNHLIDIGVAGFRIDASKHMWPGDIKAILDKLHNLNSNWFPEGSKPFIYQEVIDLGGEPIKSSDYFGNGRVTEFKYGAKLGTVIRKWNGEKMSYLKNWGEGWGFMPSDRALVFVDNHDNQRGHGAGGASILTFWDARLYKMAVGFMLAHPYGFTRVMSSYRWPRYFENGKDVNDWVGPPNDNGVTKEVTINPDTTCGNDWVCEHRWRQIRNMVNFRNVVDGQPFTNWYDNGSNQVAFGRGNRGFIVFNNDDWTFSLTLQTGLPAGTYCDVISGDKINGNCTGIKIYVSDDGKAHFSISNSAEDPFIAIHAESKL",
                "length": 511,
                "header": "sp|P0DUB6-1|AMY1A_HUMAN Isoform 1 of Alpha-amylase 1A  OS=Homo sapiens OX=9606 GN=AMY1A PE=1 SV=1 CANONICAL=P0DUB6-1"
            },
            "locus": {
                "chromosome": "1",
                "start_pos": 103664517,
                "end_pos": 103656331,
                "strand": "-",
                "evidence": [
                    {
                        "database": "Ensembl Transcript",
                        "id": "ENST00000370083.9",
                        "url": "https://www.ensembl.org/id/ENST00000370083.9"
                    },
                    {
                        "database": "Ensembl Peptide",
                        "id": "ENSP00000359100.4",
                        "url": "https://www.ensembl.org/id/ENSP00000359100.4"
                    }
                ]
            }
        }
    ],
    "glycosylation": [
        {
            "glytoucan_ac": "",
            "type": "N-linked",
            "subtype": "",
            "site_category": "reported",
            "site_seq": "N",
            "relation": "attached",
            "comment": "N-linked (GlcNAc...) asparagine",
            "start_pos": 427,
            "start_aa": "Asn",
            "end_pos": 427,
            "end_aa": "Asn",
            "residue": "Asn",
            "site_lbl": "Asn427",
            "evidence": [
                {
                    "id": "P0DUB6",
                    "database": "UniProtKB",
                    "url": "https://www.uniprot.org/uniprot/P0DUB6#ptm_processing"
                },
                {
                    "id": "16740002",
                    "database": "PubMed",
                    "url": "https://glygen.org/publication/PubMed/16740002"
                },
                {
                    "id": "1710976",
                    "database": "PubMed",
                    "url": "https://glygen.org/publication/PubMed/1710976"
                }
            ]
        },
        {
            "glytoucan_ac": "",
            "type": "N-linked",
            "subtype": "",
            "site_category": "predicted",
            "site_seq": "N",
            "relation": "attached",
            "comment": "N-linked (GlcNAc...) asparagine",
            "start_pos": 476,
            "start_aa": "Asn",
            "end_pos": 476,
            "end_aa": "Asn",
            "residue": "Asn",
            "site_lbl": "Asn476",
            "evidence": [
                {
                    "id": "P0DUB6",
                    "database": "UniProtKB",
                    "url": "https://www.uniprot.org/uniprot/P0DUB6#ptm_processing"
                }
            ]
        }
    ],
    "phosphorylation": [
        {
            "start_pos": 189,
            "end_pos": 189,
            "kinase_uniprot_canonical_ac": "",
            "kinase_gene_name": "",
            "residue": "Tyr",
            "comment": "",
            "evidence": [
                {
                    "database": "iPTMnet",
                    "id": "P0DUB6",
                    "url": "http://research.bioinformatics.udel.edu/iptmnet/entry/P0DUB6"
                },
                {
                    "database": "PubMed",
                    "id": "20068231",
                    "url": "https://glygen.org/publication/PubMed/20068231"
                }
            ],
            "site_lbl": "Tyr189"
        }
    ],
    "glycation": [],
    "keywords": [
        "enzyme",
        "glycoprotein",
        "glycoprotein_predicted",
        "glycoprotein_reported"
    ],
    "publication": [
        {
            "title": "Subsite mapping of the human pancreatic alpha-amylase active site through structural, kinetic, and mutagenesis techniques.",
            "journal": "Biochemistry",
            "date": "2000",
            "authors": "Brayer GD, Sidhu G, Maurus R, Rydberg EH, Braun C, Wang Y, Nguyen NT, Overall CM, Withers SG",
            "evidence": [
                {
                    "database": "Reactome",
                    "id": "R-HSA-189085",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-189085"
                }
            ],
            "reference": [
                {
                    "type": "PubMed",
                    "id": "10769135",
                    "url": "https://glygen.org/publication/PubMed/10769135"
                }
            ]
        },
        {
            "title": "Identification of a novel acidic mammalian chitinase distinct from chitotriosidase.",
            "journal": "The Journal of biological chemistry",
            "date": "2001",
            "authors": "Boot RG, Blommaart EF, Swart E, Ghauharali-van der Vlugt K, Bijl N, Moe C, Place A, Aerts JM",
            "evidence": [
                {
                    "database": "Reactome",
                    "id": "R-HSA-189085",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-189085"
                }
            ],
            "reference": [
                {
                    "type": "PubMed",
                    "id": "11085997",
                    "url": "https://glygen.org/publication/PubMed/11085997"
                }
            ]
        },
        {
            "title": "Probing the role of a mobile loop in substrate binding and enzyme activity of human salivary amylase.",
            "journal": "Journal of molecular biology",
            "date": "2003",
            "authors": "Ramasubbu N, Ragunath C, Mishra PJ",
            "evidence": [
                {
                    "database": "UniProtKB",
                    "id": "P0DUB6",
                    "url": "https://www.uniprot.org/uniprot/P0DUB6"
                }
            ],
            "reference": [
                {
                    "type": "PubMed",
                    "id": "12527308",
                    "url": "https://glygen.org/publication/PubMed/12527308"
                }
            ]
        },
        {
            "title": "The maltase-glucoamylase gene: common ancestry to sucrase-isomaltase with complementary starch digestion activities.",
            "journal": "Proceedings of the National Academy of Sciences of the United States of America",
            "date": "2003",
            "authors": "Nichols BL, Avery S, Sen P, Swallow DM, Hahn D, Sterchi E",
            "evidence": [
                {
                    "database": "Reactome",
                    "id": "R-HSA-189085",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-189085"
                }
            ],
            "reference": [
                {
                    "type": "PubMed",
                    "id": "12547908",
                    "url": "https://glygen.org/publication/PubMed/12547908"
                }
            ]
        },
        {
            "title": "Changing genes; losing lactase.",
            "journal": "Gut",
            "date": "2003",
            "authors": "Grand RJ, Montgomery RK, Chitkara DK, Hirschhorn JN",
            "evidence": [
                {
                    "database": "Reactome",
                    "id": "R-HSA-189085",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-189085"
                }
            ],
            "reference": [
                {
                    "type": "PubMed",
                    "id": "12692040",
                    "url": "https://glygen.org/publication/PubMed/12692040"
                }
            ]
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                                "database": "UniProtKB",
                                "id": "P0DUB6",
                                "url": "https://www.uniprot.org/uniprot/P0DUB6"
                            }
                        ],
                        "pmid": ""
                    },
                    {
                        "name": "alpha-amylase activity",
                        "id": "GO:0004556",
                        "url": "https://www.ebi.ac.uk/QuickGO/term/GO:0004556",
                        "evidence": [
                            {
                                "database": "UniProtKB",
                                "id": "P0DUB6",
                                "url": "https://www.uniprot.org/uniprot/P0DUB6"
                            }
                        ],
                        "pmid": ""
                    }
                ]
            }
        ]
    },
    "pro_annotation": [],
    "site_annotation": [
        {
            "start_pos": 427,
            "end_pos": 429,
            "annotation": "n_glycosylation_sequon"
        },
        {
            "start_pos": 476,
            "end_pos": 478,
            "annotation": "n_glycosylation_sequon"
        }
    ],
    "ptm_annotation": [],
    "interactions": [],
    "reactions": [
        {
            "id": "R-HSA-188979",
            "name": "Digestion of linear starch (amylose) by extracellular amylase",
            "equation": "",
            "summary": "Extracellular amylose starch, linear polymers of glucose joined by alpha-1,4 linkages, is digested by the endoglucosidase activity of alpha-amylases, yielding maltose, maltotriose, and longer maltosides. The human genome contains five functional alpha-amylase genes, encoding structurally closely related isoenzymes (Gumucio et al. 1988). Three of these genes encode proteins synthesized in the parotid glands and released into the saliva (amylase 1A, B, and C), and the other two encode proteins synthesized in the exocrine pancreas and released into the small intestine (amylase 2A and B). In the human body, starch digestion thus commences in the mouth, mediated by salivary amylases, and is continued in the small intestine, mediated by the pancreatic ones.<p>X-ray crystallographic studies of amylase 1A and 2A proteins show them to be monomers, complexed with single calcium and chloride ions (Ramasubbu et al. 1996; Brayer et al. 2000). Biochemical characterization of amylase 2A indicates that the enzyme efficiently cleaves poly-glucose chains so as to release maltose - a glucose disaccharide - from the reducing end of the chain (Braun et al. 1993; Brayer et al. 2000).",
            "cellular_location": "extracellular region",
            "input_participant_list": [
                "R-ALL-189075"
            ],
            "output_participant_list": [],
            "enzyme_list": [
                "P04746-1",
                "P19961-1",
                "P0DTE7-1",
                "P0DUB6-1",
                "P0DTE8-1"
            ],
            "evidence": [
                {
                    "id": "R-HSA-188979",
                    "database": "Reactome",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-188979"
                }
            ]
        },
        {
            "id": "R-HSA-191114",
            "name": "Digestion of branched starch (amylopectin) by extracellular amylase",
            "equation": "",
            "summary": "The 1-4 linkages of extracellular amylopectin starch, a glucose polymer containing linear segments formed by alpha-1,4 linkages and a smaller number of alpha-1,6 linkages forming branch points, are digested by the endoglucosidase activity of alpha-amylases, yielding maltose, maltotriose, and longer maltosides from the alpha-1,4 linear segments and alpha-limit dextrins from the branch points. Alpha-limit dextrins are glucose (G) oligomers linked by 1-4 and 1-6 bonds. 1-6 branch points make up about 5% of all amylopectin glucose bonds - the exact fraction depends on the source of the starch. Mass spectroscopic analysis of alpha-limit dextrin shows it to be a mixture of maltosides and isomaltosides containing two to forty G residues, but the most common contain fewer than seven. Maltose (G2) is the shortest 1-4 maltoside produced by alpha-amylase. Isomaltose (G2) is the shortest 1-6 isomaltoside.<p>The human genome contains five functional alpha-amylase genes, encoding structurally closely related isoenzymes (Gumucio et al. 1988). Three of these genes encode proteins synthesized in the parotid glands and released into the saliva (amylase 1A, B, and C), and the other two encode proteins synthesized in the exocrine pancreas and released into the small intestine (amylase 2A and B). In the human body, starch digestion thus commences in the mouth, mediated by salivary amylases, and is continued in the small intestine, mediated by the pancreatic ones.<p>X-ray crystallographic studies of amylase 1A and 2A proteins show them to be monomers, complexed with single calcium and chloride ions (Ramasubbu et al. 1996; Brayer et al. 2000). Biochemical characterization of amylase 2A indicates that the enzyme efficiently cleaves poly-glucose chains so as to release maltose - a glucose disaccharide - from the reducing end of the chain (Braun et al. 1993; Brayer et al. 2000).",
            "cellular_location": "extracellular region",
            "input_participant_list": [
                "R-ALL-189071"
            ],
            "output_participant_list": [],
            "enzyme_list": [
                "P04746-1",
                "P19961-1",
                "P0DTE7-1",
                "P0DUB6-1",
                "P0DTE8-1"
            ],
            "evidence": [
                {
                    "id": "R-HSA-191114",
                    "database": "Reactome",
                    "url": "https://www.reactome.org/PathwayBrowser/#R-HSA-191114"
                }
            ]
        }
    ],
    "reaction_participants": [
        {
            "participant_id": "R-ALL-189071",
            "participant_name": "starch (amylopectin) [extracellular region]",
            "crossref": [
                {
                    "id": "28057",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28057",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28057",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28057",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28057",
                    "database": "ChEBI",
                    "url": ""
                }
            ]
        },
        {
            "participant_id": "R-ALL-189075",
            "participant_name": "starch (amylose) [extracellular region]",
            "crossref": [
                {
                    "id": "28102",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28102",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28102",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28102",
                    "database": "ChEBI",
                    "url": ""
                },
                {
                    "id": "28102",
                    "database": "ChEBI",
                    "url": ""
                }
            ]
        }
    ],
    "reaction_enzymes": [
        {
            "uniprot_ac": "P04746",
            "gene_name": "AMY2A",
            "activity": [
                {
                    "ec_number": "3.2.1.1",
                    "activity": "Endohydrolysis of (1->4)-alpha-D-glucosidic linkages in polysaccharides containing three or more (1->4)-alpha-linked D-glucose units.",
                    "evidence": [
                        {
                            "id": "P04746",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P04746"
                        }
                    ]
                },
                {
                    "ec_number": "3.2.1.1",
                    "activity": "",
                    "evidence": [
                        {
                            "id": "P04746",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P04746"
                        }
                    ]
                }
            ]
        },
        {
            "uniprot_ac": "P0DTE7",
            "gene_name": "AMY1B",
            "activity": [
                {
                    "ec_number": "3.2.1.1",
                    "activity": "Endohydrolysis of (1->4)-alpha-D-glucosidic linkages in polysaccharides containing three or more (1->4)-alpha-linked D-glucose units.",
                    "evidence": [
                        {
                            "id": "P0DTE7",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DTE7"
                        }
                    ]
                },
                {
                    "ec_number": "3.2.1.1",
                    "activity": "",
                    "evidence": [
                        {
                            "id": "P0DTE7",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DTE7"
                        }
                    ]
                }
            ]
        },
        {
            "uniprot_ac": "P0DTE8",
            "gene_name": "AMY1C",
            "activity": [
                {
                    "ec_number": "3.2.1.1",
                    "activity": "Endohydrolysis of (1->4)-alpha-D-glucosidic linkages in polysaccharides containing three or more (1->4)-alpha-linked D-glucose units.",
                    "evidence": [
                        {
                            "id": "P0DTE8",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DTE8"
                        }
                    ]
                },
                {
                    "ec_number": "3.2.1.1",
                    "activity": "",
                    "evidence": [
                        {
                            "id": "P0DTE8",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DTE8"
                        }
                    ]
                }
            ]
        },
        {
            "uniprot_ac": "P0DUB6",
            "gene_name": "AMY1A",
            "activity": [
                {
                    "ec_number": "3.2.1.1",
                    "activity": "Endohydrolysis of (1->4)-alpha-D-glucosidic linkages in polysaccharides containing three or more (1->4)-alpha-linked D-glucose units.",
                    "evidence": [
                        {
                            "id": "P0DUB6",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DUB6"
                        }
                    ]
                },
                {
                    "ec_number": "3.2.1.1",
                    "activity": "",
                    "evidence": [
                        {
                            "id": "P0DUB6",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P0DUB6"
                        }
                    ]
                }
            ]
        },
        {
            "uniprot_ac": "P19961",
            "gene_name": "AMY2B",
            "activity": [
                {
                    "ec_number": "3.2.1.1",
                    "activity": "Endohydrolysis of (1->4)-alpha-D-glucosidic linkages in polysaccharides containing three or more (1->4)-alpha-linked D-glucose units.",
                    "evidence": [
                        {
                            "id": "P19961",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P19961"
                        }
                    ]
                },
                {
                    "ec_number": "3.2.1.1",
                    "activity": "",
                    "evidence": [
                        {
                            "id": "P19961",
                            "database": "UniProtKB",
                            "url": "https://www.uniprot.org/uniprot/P19961"
                        }
                    ]
                }
            ]
        }
    ],
    "biomarkers": [],
    "synthesized_glycans": [],
    "cluster_types": [],
    "sequence_features": {
        "n_linked_sites": [
            427,
            476
        ],
        "o_linked_sites": [],
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        ],
        "glycation_sites": [],
        "phosphorylation_sites": [
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        ],
        "sequon_annotation_sites": [
            {
                "start_pos": 427,
                "end_pos": 429
            },
            {
                "start_pos": 476,
                "end_pos": 478
            }
        ]
    },
    "section_stats": [
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}
