PMID- 10471394 OWN - NLM STAT- MEDLINE DCOM- 19991007 LR - 20191210 IS - 0006-291X (Print) IS - 0006-291X (Linking) VI - 262 IP - 3 DP - 1999 Sep 7 TI - Characterization of the VEGF binding site on the Flt-1 receptor. PG - 731-8 AB - The angiogenic growth factor VEGF binds to the receptor tyrosine kinases Flt-1 and KDR/Flk-1. Immunoglobulin (Ig)-like loop-2 of Flt-1 is involved in binding VEGF, but the contribution of other Flt-1 Ig-loops to VEGF binding remains unclear. We tested the ability of membrane-bound chimeras between the extracellular domain of Flt-1 and the cell adhesion molecule embigin to bind VEGF. VEGF bound as well to receptors containing Flt-1 loops 1-2 or 2-3 as it did to the entire Flt-1 extracellular domain. Chimeras containing only loop-2 of Flt-1 bound VEGF with 22-fold lower affinity. We conclude that high-affinity VEGF binding requires Ig-like loop-2 plus either loop-1 or loop-3. In addition, Flt-1 amino acid residues Arg-224 and Asp-231 were not essential for high-affinity binding of VEGF to membrane-bound Flt-1. CI - Copyright 1999 Academic Press. FAU - Herley, M T AU - Herley MT AD - Biochemistry Department, St. Jude Children's Research Hospital, Memphis, Tennessee, USA. FAU - Yu, Y AU - Yu Y FAU - Whitney, R G AU - Whitney RG FAU - Sato, J D AU - Sato JD LA - eng SI - GENBANK/AF063657 SI - GENBANK/AJ009698 GR - DK38639/DK/NIDDK NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Biochem Biophys Res Commun JT - Biochemical and biophysical research communications JID - 0372516 RN - 0 (DNA Primers) RN - 0 (EMB protein, human) RN - 0 (Emb protein, rat) RN - 0 (Endothelial Growth Factors) RN - 0 (Glycoproteins) RN - 0 (Lymphokines) RN - 0 (Membrane Glycoproteins) RN - 0 (Membrane Proteins) RN - 0 (Molecular Chaperones) RN - 0 (Proto-Oncogene Proteins) RN - 0 (Receptors, Growth Factor) RN - 0 (Recombinant Fusion Proteins) RN - 0 (Recombinant Proteins) RN - 0 (Vascular Endothelial Growth Factor A) RN - 0 (Vascular Endothelial Growth Factors) RN - EC 2.7.10.1 (Receptor Protein-Tyrosine Kinases) RN - EC 2.7.10.1 (Receptors, Vascular Endothelial Growth Factor) RN - EC 2.7.10.1 (Vascular Endothelial Growth Factor Receptor-1) SB - IM MH - Amino Acid Substitution MH - Animals MH - Base Sequence MH - Binding Sites MH - Cloning, Molecular MH - DNA Primers MH - Endothelial Growth Factors/*metabolism MH - Glycoproteins/chemistry/metabolism MH - Humans MH - Kinetics MH - Lymphokines/*metabolism MH - Membrane Glycoproteins MH - Membrane Proteins MH - Molecular Chaperones MH - Molecular Sequence Data MH - Mutagenesis, Site-Directed MH - Protein Structure, Secondary MH - Proto-Oncogene Proteins/chemistry/genetics/*metabolism MH - Rats MH - Receptor Protein-Tyrosine Kinases/chemistry/genetics/*metabolism MH - Receptors, Growth Factor/chemistry/genetics/*metabolism MH - Receptors, Vascular Endothelial Growth Factor MH - Recombinant Fusion Proteins/chemistry/metabolism MH - Recombinant Proteins/metabolism MH - Restriction Mapping MH - Vascular Endothelial Growth Factor A MH - Vascular Endothelial Growth Factor Receptor-1 MH - Vascular Endothelial Growth Factors EDAT- 1999/09/02 00:00 MHDA- 1999/09/02 00:01 CRDT- 1999/09/02 00:00 PHST- 1999/09/02 00:00 [pubmed] PHST- 1999/09/02 00:01 [medline] PHST- 1999/09/02 00:00 [entrez] AID - 10.1006/bbrc.1999.1282 [doi] AID - S0006-291X(99)91282-2 [pii] PST - ppublish SO - Biochem Biophys Res Commun. 1999 Sep 7;262(3):731-8. doi: 10.1006/bbrc.1999.1282.