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J. Biol. Chem., Vol. 275, Issue 38, 29823-29828, September 22, 2000

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Receptor-selective Variants of Human Vascular Endothelial Growth Factor
GENERATION AND CHARACTERIZATION^*

Bing Li, Germaine Fuh, Gloria Meng^§, Xiaohua Xin^¶, Mary E. Gerritsen^¶, Brian Cunningham, and Abraham M. de Vos^**

From the Departments of  Protein Engineering, ^§ BioAnalytical Technology, and ^¶ Cardiovascular Research, Genentech, Inc., South San Francisco, California 94080

Vascular endothelial growth factor (VEGF) is a pleiotropic factor that exerts a multitude of biological effects through its interaction with two receptor tyrosine kinases, fms-like tyrosine kinase (Flt-1) or VEGF receptor 1 and kinase insert domain-containing receptor (KDR) or VEGF receptor 2. Whereas it is commonly accepted that KDR is responsible for the proliferative activities of VEGF, considerable controversy and uncertainty exist about the role of the individual receptors in eliciting many of the other effects. Based on a comprehensive mutational analysis of the receptor-binding site of VEGF, an Flt-1-selective variant was created containing four substitutions from the wild-type protein. This variant bound with wild-type affinity to Flt-1, was at least 470-fold reduced in binding to KDR, and had no activity in cell-based assays measuring autophosphorylation of KDR or proliferation of primary human vascular endothelial cells. Using a competitive phage display strategy, two KDR-selective variants were discovered with three and four changes from wild-type, respectively. Both variants had approximately wild-type affinity for KDR, were about 2000-fold reduced in binding to Flt-1, and showed activity comparable with the wild-type protein in KDR autophosphorylation and endothelial cell proliferation assays. These variants will serve as useful reagents in elucidating the roles of Flt-1 and KDR.

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