Substrate Specificity of a Novel Alcohol Resistant Metalloproteinase,Vimelysin, from Vibrio sp. T1800

Vimelysin is a novel alcohol resistant metalloproteinase from Vibrio sp. T1800. The substrate specificity of vimelysin was studied by using natural and furylacryloyl dipeptide substrates. Vimelysin cleaved mainly Pro⁷-Phe⁸ bond and slightly Tyr⁴-Ile⁵ bond in human angiotensin I. Vimelysin also cleaved mainly Phe²⁴-Phe²⁵ and Tyr¹⁶-Leu¹⁷ bonds, and slightly His⁵-Leu⁶, His¹⁰-Leu¹¹, Ala¹⁴-Leu¹⁵, and Gly²³-Phe²⁴ bonds in oxidized insulin B-chain. The substrate specificity of vimelysin, by using furylacryloyl (Fua) dipeptides were also studied. The ratio of k_cat/K_m for Fua-Gly-Phe-NH₂/Fua-Gly-Leu-NH₂, Fua-Phe-Leu-NH₂/Fua-Gly-Leu-NH₂, and Fua-Phe-Phe-NH₂/Fua-Gly-Leu-NH₂ were 15.9, 27.8, and 59.0, respectively. These results indicate that vimelysin easily recognizes phenylalanine in P1′ positions, which is different from thermolysin.