Open AccessPurification and partial characterization of Oenococcus oeni exoprotease
Author(s) -
Farías Marta E,
Manca de Nadra María C
Publication year - 2000
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2000.tb09072.x
Subject(s) - pepstatin , oenococcus oeni , protease , chemistry , enzyme , biochemistry , sodium dodecyl sulfate , gel electrophoresis , polyacrylamide gel electrophoresis , enzyme assay , chromatography , size exclusion chromatography , molecular mass , biology , malolactic fermentation , bacteria , lactic acid , genetics
The exoprotease from Oenococcus oeni produced in stress conditions was purified to homogeneity in two steps, a 14‐fold increase of specific activity and a 44% recovery of proteinase activity. The molecular mass was estimated to be 33.1 kDa by gel filtration and 17 kDa by sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS–PAGE). These results suggest that the enzyme is a dimer consisting of two identical subunits. Optimal conditions for activity on grape juice were 25°C and a pH of 4.5. Incubation at 70°C, 15 min, destroyed proteolytic activity. The SDS–PAGE profile shows that the enzyme was able to degrade the grape juice proteins at a significantly high rate. The activity at low pH and pepstatin A inhibition indicate that this enzyme is an aspartic protease. The protease activity increases at acidic pH suggesting that it could be involved in the wine elaboration.