title: T-kininogen and a 45 kda proteinase from Porphyromonas gingivalis.
abstract: To clarify the pathogenic role of proteinases from Porphyromonas gingivalis, a 45 kDa proteinase was isolated from P. gingivalis culture medium by a combination of gel filtration (Bio-Gel A-0.5 m) and ion-exchange chromatographies (DEAE-Sephacel and SP-Sepharose FF). The enzyme was found to have a molecular mass of 45 kDa by SDS-PAGE and to require mercaptoethanol for its activation. The 45 kDa proteinase cleaved T-kininogen into small fragments, but failed to release kinin. In contrast, T-kininogen inhibited the Arg-amidolytic activity of the 45 kDa proteinase with a Ki of 2 nM. On the other hand, the 45 kDa proteinase did not stimulate the production of PGE2, IL-1beta, and TNF-alpha from the macrophages.
authors.affiliation: Department of Biochemistry, School of Dentistry, Hokkaido University School of Medicine, Sapporo, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Sakamoto
authors.forename: M
authors.initials: M
authors.lastname: Nishikata
authors.forename: K
authors.initials: K
authors.lastname: Fujie
authors.forename: H
authors.initials: H
authors.lastname: Handa
authors.forename: J
authors.initials: J
authors.lastname: Nishihira
mesh_terms: D001426:Bacterial Proteins / Q000302:isolation & purification; D015232:Dinoprostone / Q000378:metabolism; D010450:Endopeptidases / Q000302:isolation & purification*; D007704:Kininogens / Q000302:isolation & purification*; D008970:Molecular Weight; D016966:Porphyromonas gingivalis / Q000201:enzymology*
chemical_list: D001426:Bacterial Proteins; D007704:Kininogens; D010450:Endopeptidases; D015232:Dinoprostone