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Selection and Characterization of Forest Soil Metagenome Genes Encoding Lipolytic Enzymes
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  • Selection and Characterization of Forest Soil Metagenome Genes Encoding Lipolytic Enzymes
  • Selection and Characterization of Forest Soil Metagenome Genes Encoding Lipolytic Enzymes
저자명
Hong. Kyung-Sik,Lim. He-Kyoung,Chung. Eu-Jin,Park. Eun-Jin,Lee. Myung-Hwan,Kim. Jin-Cheol,Cho. Gyung-Ja,Cho. Kwang-Yun,Lee. Seon
간행물명
Journal of microbiology and biotechnology
권/호정보
2007년|17권 10호|pp.1655-1660 (6 pages)
발행정보
한국미생물생명공학회
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정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

A metagenome is a unique resource to search for novel microbial enzymes from the unculturable microorganisms in soil. A forest soil metagenomic library using a fosmid and soil microbial DNA from Gwangneung forest, Korea, was constructed in Escherichia coli and screened to select lipolytic genes. A total of seven unique lipolytic clones were selected by screening of the 31,000-member forest soil metagenome library based on tributyrin hydrolysis. The ORFs for lipolytic activity were subcloned in a high copy number plasmid by screening the secondary shortgun libraries from the seven clones. Since the lipolytic enzymes were well secreted in E. coli into the culture broth, the lipolytic activity of the subclones was confirmed by the hydrolysis of p-nitrophenyl butyrate using culture supernatant. Deduced amino acid sequence analysis of the identified ORFs for lipolytic activity revealed that 4 genes encode hormone-sensitive lipase (HSL) in lipase family IV. Phylogenetic analysis indicated that 4 proteins were clustered with HSL in the database and other metagenomic HSLs. The other 2 genes and 1 gene encode non-heme peroxidase-like enzymes of lipase family V and a GDSL family esterase/lipase in family II, respectively. The gene for the GDSL enzyme is the first description of the enzyme from metagenomic screening.