1887

Abstract

The trypsin-like enzyme activity of is an important virulence determinant of this organism in destructive periodontitis. An active-site-directed inhibitor, tyrosyl-alanyl-lysyl-arginine chloromethyl ketone (YAKR-CK) was radio-iodinated and used with SDS-PAGE and autoradiography to determine the number and molecular masses of enzymes with trypsin-like specificity produced by W83. Two forms (I & II) were detected in both crude culture supernatant and whole cell sonicates. Protease I was a sharp band (47 kDa) on reducing SDS-PAGE; Protease II electrophoresed as a diffuse band in the range 70–90 kDa. The specificity with which the inhibitor bound to Protease I was established in competition experiments using other active-site-directed agents. YAKR-CK inhibited whole cell haemagglutination, supporting the possible role of trypsin-like proteases of this organism in adhesion mechanisms.

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1993-05-01
2021-05-06
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