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d-Alanyl-(d)-meso-2,6-diaminopimelic acid endopeptidase was purified 47.4-fold with a yield of 40.5% from mutanolysin, which was partially purified from the cultural supernatant of Streptomyces globisporus 1829, by using ion exchange column chromatographies and a molecular sieve column. The purified enzyme was electrophoretically homogeneous. This enzyme had a molecular weight of 13,500 and an isoelectric point of pI 9.0. This enzyme was most active at pH 8.5 and stable between pHs 8.0 and 9.0. The hydrolyzing activity of this enzyme was enhanced by Co+ + and Ca+ + but inhibited appreciably by Zn+ +, Cu+ + and EDTA. The enzyme activity was not affected by β-lactam antibiotics and vancomycin. The Km values for bisdisaccharide heptapeptide and its derivative modified chemically by BOC-S were calculated to be 5.7 × 10-4 and 4.0 × 10-4 m, respectively.

agricultural and biological chemistry

Studies on lytic enzyme toward cariogenic streptococci. Part VII. Characterization of D-alanyl-(D)-meso-2,6-diaminopimelic acid endopeptidase from Streptomyces globisporus 1829.