申请人:PROBICOM RESEARCH B.V.
公开号:EP0522203A1
公开(公告)日:1993-01-13
The present invention relates to an endopeptidase of lactic acid bacteria in isolated or purified form as well as to uses thereof, e.g., in the preparation of foods such as cheese, whippable products and meat products, or for preparing antibodies against the endopeptidase. The invention also relates to recombinant genetic information coding for the endopeptidase and transformed organisms expressing the endopeptidase. The endopeptidase can be isolated from Lactococcus lactis subsp. cremoris Wg2. It has a molecular weight of 70 kD ± 5 kD; an isoelectric point of 4.1 ± 0.4; a substrate range which includes peptides having five or more amino acids, metenkaphalin, bradykinin, glucagon, oxidized insulin β-chain and neurotensin, and excludes peptides having less than 5 amino acids, and α-, β- and κ-casein; a hydrolysis activity dependent of Co²⁺; a temperature optimum at 30-38°C and a pH optimum at 6.0-6.5.
本发明涉及一种分离或纯化形式的乳酸菌内肽酶及其用途,例如用于制备奶酪、可发产品和肉制品等食品,或制备针对内肽酶的抗体。本发明还涉及编码内肽酶的重组遗传信息和表达内肽酶的转化生物。该内肽酶可从 Lactococcus lactis subsp.它的分子量为 70 kD ± 5 kD;等电点为 4.1 ± 0.4 ;底物范围包括具有 5 个或更多氨基酸的肽、甲萘肽、缓激肽、胰高血糖素、氧化胰岛素 β 链和神经肽,不包括具有少于 5 个氨基酸的肽和α-、β- 和 κ-酪蛋白;水解活性取决于 Co²⁺;最适温度为 30-38°C,最适 pH 值为 6.0-6.5。