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• W1959569047 abstract "An enzyme from Treponema denticola that hydrolyzes a synthetic trypsin substrate, N-alpha-benzoyl-L-arginine-p-nitroanilide (BAPNA), was purified to near homogeneity, as judged by gel electrophoresis. The molecular weight of the enzyme was estimated to be ca. 69,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and ca. 50,000 by gel filtration on Sephadex G-100. The pH optimum for the hydrolysis of BAPNA was around 8.5. The enzyme was heat labile and irreversibly inactivated at low pH values. Enzyme activity was enhanced by Ca2+, Mg2+, and Ba2+ but inhibited by Mn2+, Hg2+, Co2+, and Zn2+. Metal chelators and sulfhydryl reagents had no effect on this activity. The enzyme was inhibited by certain protease inhibitors such as diisopropyl fluorophosphate, N-alpha-p-tosyl-L-lysine chloromethyl ketone, phenylmethylsulfonyl fluoride, L-1-tosylamide-2-phenylethylchloromethyl ketone, alpha-1-antitrypsin, and soybean trypsin inhibitor. The Km values for BAPNA and N-alpha-benzoyl-L-arginine ethyl ester were 0.05 and 0.12 mM, respectively, and the Vmax values were higher than those observed with trypsin. Although the purified enzyme hydrolyzed some low-molecular-weight synthetic trypsin substrates, it did not hydrolyze casein, hemoglobin, azocasein, azocoll, bovine serum albumin, or gelatin. Thus, this enzyme is probably not a protease but is capable of hydrolyzing ester, amide, and peptide bonds involving the carboxyl group of arginine and lysine." @default.
• W1959569047 created "2016-06-24" @default.
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• W1959569047 date "1986-07-01" @default.
• W1959569047 modified "2023-10-13" @default.
• W1959569047 title "Purification and characterization of an enzyme produced by Treponema denticola capable of hydrolyzing synthetic trypsin substrates" @default.
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• W1959569047 doi "https://doi.org/10.1128/iai.53.1.213-220.1986" @default.
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