PMID- 10026167 OWN - NLM STAT- MEDLINE DCOM- 19990318 LR - 20210209 IS - 0021-9258 (Print) IS - 0021-9258 (Linking) VI - 274 IP - 9 DP - 1999 Feb 26 TI - Inactivation of the glucose 6-phosphate transporter causes glycogen storage disease type 1b. PG - 5532-6 AB - Glycogen storage disease type 1b (GSD-1b) is proposed to be caused by a deficiency in microsomal glucose 6-phosphate (G6P) transport, causing a loss of glucose-6-phosphatase activity and glucose homeostasis. However, for decades, this disorder has defied molecular characterization. In this study, we characterize the structural organization of the G6P transporter gene and identify mutations in the gene that segregate with the GSD-1b disorder. We report the functional characterization of the recombinant G6P transporter and demonstrate that mutations uncovered in GSD-1b patients disrupt G6P transport. Our results, for the first time, define a molecular basis for functional deficiency in GSD-1b and raise the possibility that the defective G6P transporter contributes to neutropenia and neutrophil/monocyte dysfunctions characteristic of GSD-1b patients. FAU - Hiraiwa, H AU - Hiraiwa H AD - Heritable Disorders Branch, NICHD, National Institutes of Health, Bethesda, Maryland, 20892, USA. FAU - Pan, C J AU - Pan CJ FAU - Lin, B AU - Lin B FAU - Moses, S W AU - Moses SW FAU - Chou, J Y AU - Chou JY LA - eng SI - GENBANK/AF097831 PT - Journal Article PL - United States TA - J Biol Chem JT - The Journal of biological chemistry JID - 2985121R RN - 0 (Antiporters) RN - 0 (DNA Primers) RN - 0 (DNA, Complementary) RN - 0 (Monosaccharide Transport Proteins) RN - 0 (SLC37A4 protein, human) RN - 0 (glucose 6-phosphate(transporter)) RN - 56-73-5 (Glucose-6-Phosphate) SB - IM MH - Animals MH - Antiporters/*antagonists & inhibitors MH - Base Sequence MH - COS Cells MH - Chromosome Mapping MH - Chromosomes, Human, Pair 11 MH - Cloning, Molecular MH - DNA Primers MH - DNA, Complementary MH - Female MH - Glucose-6-Phosphate/metabolism MH - Glycogen Storage Disease Type I/*genetics MH - Humans MH - Hydrolysis MH - Male MH - Molecular Sequence Data MH - Monosaccharide Transport Proteins/*antagonists & inhibitors MH - Mutation, Missense MH - Pedigree MH - Polymorphism, Single-Stranded Conformational EDAT- 1999/02/20 00:00 MHDA- 1999/02/20 00:01 CRDT- 1999/02/20 00:00 PHST- 1999/02/20 00:00 [pubmed] PHST- 1999/02/20 00:01 [medline] PHST- 1999/02/20 00:00 [entrez] AID - 10.1074/jbc.274.9.5532 [doi] AID - S0021-9258(19)87690-1 [pii] PST - ppublish SO - J Biol Chem. 1999 Feb 26;274(9):5532-6. doi: 10.1074/jbc.274.9.5532.