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KMID : 0545120000100010103
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Journal of Microbiology and Biotechnology
2000 Volume.10 No. 1 p.103 ~ p.106
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Influence of Temperature,Oxygen,m-Chlorophenylhydrazone,Cerulenin,and Quinacrine on the Production of Extracellular Proteases in Bacillus cereus
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KIM, SAM SUN
PARK, YOUNG-HA/RHEE, IN-KOO/KIM, YOUNG JAE
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Abstract
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Bacillus cereus KCTC 3674 excretes at least two kinds of extracellular proteases into the growth medium. Two major bands of the protease activity with molecular weights of approximately 100 and 38kDa were obtained after gelatinSDS-PAGE. The protease with a molecular weight of 38kDa was identified as an extracellular neutral (metallo-) protease. The neutral protease was quite thermostabile but labile to alkaline pH. On the contrary, the 100-kDa protease was thermolabile but stable to alkaline pH. The production of 38kDa neutral protease was strongly affected by temperature, oxygen, carbonylcyanide m-chlorophenylhydrazone (CCCP) that was defined as a protonophore, and cerulenin which inhibited lipid synthesis and caused changes in the membrane composition. On the other hand, the production of the 100-kDa protease was strongly affected by only temperature and cerulenin. Quinacrine (0.2mM), which inhibits the penicillinase-releasing protease of Bacillus licheniformis, had no effect, whatsoever, on the production of extracellular proteases in B. cereus KCTC 3674.
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