Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Cloning and Characterization of Cellulase Gene (cel5C) from Cow Rumen Metagenomic Library

소 반추위 메타게놈에서 새로운 섬유소분해효소 유전자(cel5C) 클로닝 및 유전산물의 특성

  • Kim, Min-Keun (Gyeongsangnam-do Agricultural Research and Extension Service) ;
  • Barman, Dhirendra Nath (Division of Applied Life Science (BK21 Program), Gyeongsang National University) ;
  • Kang, Tae-Ho (Division of Applied Life Science (BK21 Program), Gyeongsang National University) ;
  • Kim, Jung-Ho (Department of Agricultural Chemistry, Sunchon National University) ;
  • Kim, Hoon (Department of Agricultural Chemistry, Sunchon National University) ;
  • Yun, Han-Dae (Division of Applied Life Science (BK21 Program), Gyeongsang National University)
  • Received : 2011.12.19
  • Accepted : 2012.02.14
  • Published : 2012.04.30
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Abstract

A metagenomic library of cow rumen in the pCC1FOS phage vector was screened in $E.$ $coli$ EPI300 for cellulase activity on carboxymethyl cellulose agar plates. One clone was partially digested with $Sau$3AI, ligated into the $Bam$HI site of the pBluescript II SK+ vector, and transformed into $E.$ $coli$ $DH5{\alpha}$. We obtained a 1.5 kb insert DNA, designated $cel$5C, which hydrolyzes carboxymethyl cellulose. The cel5C gene has an open reading frame (ORF) of 1,125 bp encoding 374 amino acids. It belongs to the glycosyl hydrolase family 5 with the conserved domain LIMEGFNEIN. The molecular mass of the Cel5C protein induced from $E.$ $coli$ $DH5{\alpha}$, as analyzed by CMC SDS-PAGE, appeared to be approximately 42 kDa. The enzyme showed optimum cellulase activity at pH 4.0, and $50^{\circ}C$. We examined whether the $cel$5C gene comes from the 49 identified cow rumen bacteria using PCR. No PCR bands were identified, suggesting that the $cel$5C gene came from the unidentified cow rumen bacteria.

한우의 반추위에서 게놈 DNA를 분리하여 메타게놈 은행을 구축한 다음 섬유소분해효소를 암호화하는 유전자를 클로닝 및 유전자를 선별하였다. 선별된 유전자의 DNA 염기서열 및 아미노산 서열을 분석하고 유전산물의 생화학적인 특성을 조사하였다. $cel$5C 유전자는 1,125 bp로 374개의 아미노산 잔기를 가진 단백질을 암호화하였으며 이 단백질 분자량은 42 kDa이었다. 이 효소의 최적 pH는 4 근방이었으며 최적 온도는 $50^{\circ}C$ 부근이었다. $cel$5C 유전자의 internal primer를 사용하여 인공적으로 배양할 수 있는 49종의 반추세균에서 분리한 게놈 DNA을 주형으로 PCR 분석한 결과 해당하는 밴드를 확인할 수 없었다. Cel5C는 현재로서는 배양할 수 없는 반추 미생물로 추정된다.

Keywords

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