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Functional Analysis of Gene ID1103135 Encoding a 3-Phytase Precursor Homologue of Streptomyces coelicolor  

김미순 (명지대학교 생명정보학부)
강대경 ((주)이지바이오시스템 중앙연구)
이홍섭 (일동제약주식회사 중앙연구)
연승우 (일동제약주식회사 중앙연구)
김태영 (일동제약주식회사 중앙연구)
홍순광 (명지대학교 생명정보학부)
Publication Information
Korean Journal of Microbiology / v.40, no.2, 2004 , pp. 81-86 More about this Journal
Abstract
Among the annotated ORFs of Streptomyces coelicolor, SCO7697 was supposed to encode for phytase (myo-inositol hexakisphosphate phosphohydrolase). The DNA fragment containing SCO7697 was cloned by the PCR from the chromosomal DNA of S.coelicolor A3(2)M. The cloned fragment was introduced into E. coli expres-sion vector, pET28a(+), to yield two recombinant plasmids, pET28-SP and pET28-LP, which were designed to encode different length of proteins. When the pET28-SP and pET28-LP were introduced into E. coli BL21, the transformants successfully overexpressed recombinant proteins, but the molecular weights of the expressed pro-teins were appeared bigger than those of expected in SDS-polyacrylamide gel electrophoresis. The shift of cul-tural temperature from 37 to $30^{\circ}C$ made most of expressed protein be solubilized. The expressed protein, however, did not show any phytase activity. When the DNA fragment with its own promoter placed on the E. coli-Streptomyces vector, pWHM3, and introduced into S. lividans, the phytase activity was not detected either. These results suggest that even though the SCO7697 was annotated as a probable phytase with high probability (E value is $6e^{-89}$), the real product doest not have phytase activity.
Keywords
phytase; phytic acid; S. coelicolor; SCO7697;
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Times Cited By KSCI : 1  (Citation Analysis)
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