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KMID : 1234420090370030183
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Korean Journal of Microbiololgy and Biotechnology
2009 Volume.37 No. 3 p.183 ~ p.188
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Isolation and Charaterization of Myxobacteria with Proteolytic Activity
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Kim Jae-Young
Cho Kyung-Yun
Chung Jin-Woo
Yi Yong-Sub
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Abstract
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Seven isolates showing strong proteolytic activity, KYC 1028, 1100, 1134, 1139, 1151, 1159, and 1182, were collected. Out of them, the broth of KYC 1134 and KYC 1139 showed the high proteolytic activity measured by azocazein. To determine 16S rDNA sequences for identification, 16S rDNA of seven isolates were amplified and compared with the 16S rDNA sequences of other myxobacteria at NCBI. It is evident from the phylogenetic tree that the isolates belong to the genus Myxococcus. Sharing high percentage similarity values with myxobacteria, the 16S rDNA sequences were involved in two species, Myxococcus macrospores and M. Fulvus. Biochemical characteristics of KYC 1134 broth, which showed the highest proteolytic activity, showed increased activity 8 times to seven days after culture, and protein production were increased gradually and stopped at five days. The broth had optimal temperature at 60oC for proteolytic activity, and stability of pH was ranged from pH 5 to 10, at 50oC and 60, respectively. To classify proteases being in the broth, ten inhibitors were determined and only bestatin showed 27% inhibition effect. The inhibition result demonstrates that the broth contains kinds of amino peptidases and other exopeptidases.
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KEYWORD
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Myxobacteria, proteolytic activity, 16S rDNA
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