Purification and analysis of proteinase-resistant mutants of recombinant platelet-derived growth factor-BB exhibiting improved biological activity.


Journal Article

Recombinant platelet-derived growth factor (PDGF)-BB was expressed and secreted from yeast in order to study the structure-function relationships of this mitogen. A simple purification scheme has been developed which yields greater than 95% pure PDGF-BB. Analysis of this recombinant PDGF-BB shows partial proteolysis after arginine-32. Substitution of this arginine residue, or arginine-28 [a potential KEX2 (lysine-arginine endopeptidase) cleavage site], prevents or reduces cleavage of PDGF-BB respectively. These mutations result in a 5-fold increase in expression levels of PDGF-BB, and the resulting mutant proteins show higher activity in a number of biological assays than the cleaved wildtype PDGF-BB. These data are in accord with previous work by Giese, LaRochelle, May-Siroff, Robbins & Aaronson [(1990) Mol. Cell Biol. 10, 5496-5501] suggesting that the region isoleucine-25-phenylalanine-37 is involved in PDGF-receptor binding.

Full Text

Cited Authors

  • Cook, AL; Kirwin, PM; Craig, S; Bawden, LJ; Green, DR; Price, MJ; Richardson, SJ; Fallon, A; Drummond, AH; Edwards, RM

Published Date

  • January 1, 1992

Published In

Volume / Issue

  • 281 ( Pt 1) /

Start / End Page

  • 57 - 65

PubMed ID

  • 1731768

Pubmed Central ID

  • 1731768

Electronic International Standard Serial Number (EISSN)

  • 1470-8728

International Standard Serial Number (ISSN)

  • 0264-6021

Digital Object Identifier (DOI)

  • 10.1042/bj2810057


  • eng