Characterization of the Treponema denticola prtP gene encoding a prolyl-phenylalanine-specific protease (dentilisin).

AUTOR(ES)

Ishihara, K

RESUMO

A chymotrypsin-like protease from Treponema denticola ATCC 35405 was purified by chromatographic techniques. The purified enzyme consisted of three polypeptides (38, 43, and 72 kDa). The protease exhibited specificity for peptide bonds containing phenylalanine and proline at the P1 and P2 positions, respectively, and was classified as a serine protease on the basis of inhibition studies. Naturally occurring protease inhibitors such as alpha1-antitrypsin and alpha1-antichymotrypsin had no effect on enzymatic activity. The enzyme degraded fibronectin, alpha1-antitrypsin, and gelatin while weakly degrading the immunoglobulin G heavy chain and type IV collagen. N-terminal amino acid sequences were determined for the 43- and 72-kDa proteins. On the basis of these sequences, the genes coding for the 43- and 72-kDa proteins were isolated and sequenced. The open reading frame which codes for the 72-kDa protein was designated prtP. This gene consists of 2,169 bp and codes for a protein with an Mr of 77,471. The protein appeared to be composed of a signal peptide region followed by a prosequence and the mature protein domain. The deduced amino acid sequence exhibited similarity with that of the Bacillus subtilis serine protease subtilisin. The deduced properties of the sequence suggest that the 72-kDa protein is a chymotrypsin-like protease. However, the nature and function of the 43-kDa protein have not yet been determined.

Documentos Relacionados

• Cleavage of Treponema denticola PrcA Polypeptide To Yield Protease Complex-Associated Proteins Prca1 and Prca2 Is Dependent on PrtP
• Analysis of the prtP gene encoding porphypain, a cysteine proteinase of Porphyromonas gingivalis.
• Mutagenesis of a Novel Gene in the prcA-prtP Protease Locus Affects Expression of Treponema denticola Membrane Complexes
• Isolation and characterization of the Treponema denticola prtA gene coding for chymotrypsinlike protease activity and detection of a closely linked gene encoding PZ-PLGPA-hydrolyzing activity.
• Activities of the Porphyromonas gingivalis PrtP Proteinase Determined by Construction of prtP-Deficient Mutants and Expression of the Gene in Bacteroides Species