4.2.2.8 | physiological function |
differential effects of heparitinase I and heparitinase III, EC 4.2.2.7, on endothelial tube formation. The enzymes inhibit tube formation and reduce tumor-derived neovascularization in vivo by reducing bFGF binding and subsequent signaling, HepIII has a stronger effect than Hep I. Heparitinases, isolated from Flavobacterium heparinum, cleave heparan sulfate chains at defined locations, Hep I cleaves heparin sulfate chains containing glucuronic acid residues adjacent to glucosamine residues containing either N-acetyl or N-sulfate groups. Hep I generates fragments that retain their growth factor binding capability and therefore still potentiate tube formation |
714027 |