Porphyromonas gingivalis arginine-specific proteinase coding sequences

Abstract

Provided herein is a nucleotide sequence encoding an Arg-specific gingipain, said Arg-gingipain characterized as having an apparent molecular mass of 50 kDa as estimated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and an apparent molecular mass of 44 kDa as estimated by gel filtration chromatography, said gingipain-1 having amidolytic and proteolytic activity for cleavage after arginine residues and having no amidolytic and/or proteolytic activity for cleavage after lysine residues, wherein the amidolytic and/or proteolytic activity is inhibited by cysteine protease group-specific inhibitors including iodoacetamide, iodoacetic acid, N-ethylmaleimide, leupeptin, antipain, trans-epoxysuccinyl-L-leucylamido-(4-guanidino)butane, TLCK, TPCK, p-aminobenzamidine, N-chlorosuccinamide, and chelating agents including EDTA and EGTA, wherein the amidolytic and/or proteolytic activity of said gingipain-1 is not sensitive to inhibition by human cystatin C, α2-macroglobulin, α1-proteinase inhibitor, antithrombin III, α2-antiplasmin, serine protease group-specific inhibitors including diisopropylfluorophosphate, phenylmethyl sulfonylfluoride and proteolytic activities of ginigipan-1 are stabilized by Ca2+ and 3,4-diisochlorocoumarin, and wherein the amidolytic and/or wherein the amidolytic and/or proteolytic activities of said gingipain-1 are stimulated by glycine-containing peptides and glycine analogues, and methods for preparation. As specifically exemplified, high and low molecular weight forms of Arg-gingipains and sequences encoding them are prepared from Porphyromonas gingivalis. Said high molecular weight Arg-gingipain comprises a proteolytic component as described hereinabove and at least one hemagglutinin component.

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