Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Cloning and Expression of A Bacillus licheniformis Cellulase Gene

Bacillus licheniformis WL-12의 cellulase 유전자 클로닝과 발현

  • Yoon, Ki-Hong (School of Food Science & Biotechnology, Woosong University)
  • 윤기홍 (우송대학교 응용식품.영양학부)
  • Published : 2006.12.30
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Abstract

A thermophilic bacterium producing the extracellular cellulase was isolated from soybean paste, and the isolate WL-12 has been identified as Bacillus licheniformis on the basis on its 16S rRNA sequence, morphology and biochemical properties. A gene encoding the cellulase of B. licheniformis WL-12 was cloned and its nucleotide sequence was determined. This cellulase gene, designated celA, consisted of 1,551 nucleotides, encoding a polypeptide of 517 amino acid residues. The gene product contained catalytic domain and cellulose binding domain. The deduced amino acid sequence was highly homologous to those of cellulases of B. licheniformis, B. subtilis and B. amytoliquefaciens belonging to the glycosyl hydrolase family 5. When the celA gene was highly expressed using a strong B. subtilis promoter, the extracellular cellulase was produced up to 7.0 units/ml in B. subtilis WB700.

가정에서 제조된 된장으로부터 cellulase 생산균으로 분리된 고온성 WL-12는 형태적 특성, 생화학적 성질 및 16S rRNA의 염기서열에 근거하여 Bacillus licheniformis로 동정되었다. B. licheniformis WL-12의 cellulase 유전자를 클로닝하여 그 염기서열을 결정한 결과 cellulase 유전자(celA)는 517 아미노산으로 구성된 단백질을 코드하며 1,551 뉴클레오티드로 이루어졌다. 아미노산 잔기배열을 분석한 결과 WL-12의 cellulase는 활성영역과 cellulose 결합영역으로 구성되어 있었으며, glycosyl hydrolase (GH) family 5에 속하는 B. licheniformis, B. subtilis와 B. amyloliquefaciens의 cellulase와 높은 상동성을 보였다. 클론된 celA를 발현용 vector에 도입하여 B. subtilis에서 발현시켜 cellulase 최대생산성이 7.0 units/ml에 이르렀다.

Keywords

References

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