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Serum amyloid P component (SAP), a normal plasma glycoprotein, has recently been shown to have Ca2+-dependent binding specificity for methyl 4,6-O-(1-carboxyethylidene)-beta-D-galactopyranoside (MO beta DG) [Hind, Collins, Renn, Cook, Caspi, Baltz &amp; Pepys (1984) J. Exp. Med. 159, 1058-1069]. SAP was found to bind in vitro to Klebsiella rhinoscleromatis, the cell wall of which is known to contain this particular cyclic pyruvate acetal of galactose. SAP also bound in similar amounts (approx. 6000 molecules per organism) to group A Streptococcus pyogenes, but very much less was taken up on Xanthomonas campestris, which contains the 4,6-cyclic pyruvate acetal of mannose. No SAP bound to Escherichia coli, which contains the 4,6-cyclic pyruvate acetal of glucose, or to Streptococcus pneumoniae type 4, which contains the 2,3-cyclic pyruvate acetal of alpha- rather than beta-galactopyranoside, or to other organisms (Streptococcus agalactiae, Staphylococcus aureus and Staphylococcus epidermidis), the carbohydrate structures of which are less well characterized. Binding of SAP to those organisms which it did recognize was completely inhibited or reversed by millimolar concentrations of free MO beta DG. SAP, a human plasma protein, thus behaves as a lectin and may be a useful probe for its particular specific ligand in the cell walls of bacteria and other organisms.

biochemical journal

Human serum amyloid P component, a circulating lectin with specificity for the cyclic 4,6-pyruvate acetal of galactose. Interactions with various bacteria