PMID: 9431988Feb 7, 1998Paper

The C-terminal domain V of perlecan promotes beta1 integrin-mediated cell adhesion, binds heparin, nidogen and fibulin-2 and can be modified by glycosaminoglycans

European Journal of Biochemistry
J C BrownR Timpl

Abstract

Domain V of the major basement-membrane proteoglycan perlecan, a domain which consists of three laminin type G (LG) and four epidermal-growth-factor-like (EG) modules, was obtained in recombinant form by transfecting embryonic kidney cells with an episomal expression vector. A major 90-kDa fragment V was obtained together with fragments Va (74 kDa) and Vb (26 kDa) which were generated by endogenous proteolysis in front of the most C-terminal LG module. All three fragments bound to a heparin affinity column and could be displaced at a moderate (0.2 M) NaCl concentration. Rotary-shadowing electron microscopy demonstrated a three-globule structure for fragment V. Fragment V also showed a strong immunological cross-reaction with tissue-derived perlecan, indicating that it was folded into a native structure. A further, larger fragment, Vc, was apparently substituted with heparan sulphate and/or chondroitin sulphate chains and failed to bind to heparin. Fragment V but not fragment Vc promoted a distinct adhesion of several cell lines and this could be blocked by antibodies against the integrin beta1 chain. This domain may, however, represent only one of several cell-adhesive sites of perlecan. The recombinant perlecan fragment V boun...Continue Reading

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