Abstract
We found thatPenicillium roqueforti isolated from a commercial blue cheese produced an acid carboxypeptidase. The acid carboxypeptidase was present in mycelia and little was detected in the liquid medium. The optimum pH for benzyloxycarbonyl-Glu-Tyr was 3.6. The enzyme had the ability to liberate the carboxyterminal amino acid (leucine) of angiotensin I at pH 3.6. Furthermore, the enzyme liberated the carboxyterminal proline from benzyloxycarbonyl-Gly-Pro-Leu-Gly-Pro. The molecular weight of the enzyme determined by gel filtration on Sephadex G-200 was 155,000. The acid carboxypeptidase was inhibited by phenylmethanesulfonyl fluoride and hydrocinnamic acid.
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