Characterization of high affinity binding between laminin and the acute-phase protein, serum amyloid A.

The Journal of Biological Chemistry
J B Ancsin, R Kisilevsky

Abstract

Serum amyloid A isoforms, apoSAA1 and apoSAA2, are acute-phase proteins of unknown function and can be precursors of amyloid AA peptides (AA) found in animal and human amyloid deposits. These deposits are often a complication of chronic inflammatory disorders and are associated with a local disturbance in basement membrane (BM). In the course of trying to understand the pathogenesis of this disease laminin, a major BM glycoprotein, has been discovered to bind saturably, and with high affinity to murine acute-phase apoSAA. This interaction involves a single class of binding sites, which are ionic in nature, conformation-dependent, and possibly involve sulfhydryls. Binding activity was significantly enhanced by Zn2+, an effect possibly mediated through Cys-rich zinc finger-like sequences on laminin. Collagen type IV also bound apoSAA but with lower affinity. Unexpectedly, no binding was detected for perlecan, a BM proteoglycan previously implicated in AA fibrillogenesis, although a low affinity interaction cannot be excluded. Entactin, another BM protein that functions to cross-link the BM matrix and is normally complexed with laminin, could inhibit laminin-apoSAA binding suggesting apoSAA does not bind to normal BM. Since lamini...Continue Reading

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