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Moraxella sp. CK-1 의 세포외 효소에 의한 Anabaena cylindrica 세포벽의 분해
김철호,최영길,민병례 ( Chul Ho Kim,Yong Keel Choi,Byung Re Min ) 한국환경생물학회 1997 환경생물 : 환경생물학회지 Vol.15 No.1
Moraxella sp. CK-1 has been known to inhibit the growth of cyanobacteria including A. cylindrica. This growth inhibition by the bacteria was accomplished through the secretion of lytic enzyme (s) out of the bacterial cells. Extracellular cell wall lytic and proteolytic activity, which began to appear at the early exponential growth phase, changed similarly during the growth of Moraxella sp. CK-1. Extracellular cell wall lytic enzyme showed a temperature optimum of 60~70℃, a temperature stability of up to 60℃, and a pH optimum of 9.0. The lytic activity was enhanced by several enzyme stabilizers, chemicals, and metal ions except Ca^2+ and Mn^2+. Fe^3+ and Cu^2+ ions inhibited the lytic activity almost completely. The lytic enzyme was believed to be amidase or endopeptidase from the result that free amino groups in substrate solution increased when SDS-insoluble peptidoglycan was treated with extracellular enzyme(s) of Moraxella sp. CK-1.