Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Analysis of Gene Encoding the PBSA Degradation Enzyme

PBSA 분해효소 유전자의 분석

  • Joo, Hyun-Jin (Department of Life Science, Sangmyung University) ;
  • Kim, Mal-Nam (Department of Life Science, Sangmyung University)
  • Received : 2010.03.31
  • Accepted : 2010.05.22
  • Published : 2010.06.01
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Abstract

Burkholderia cepacia PBSA-7, Bacillus licheniformis PBSA-8 and Burkholderia sp. PBSA-9 previously collected from Korea soil (Joo and Kim, 2009) were analyzed for the presence of genes encoding proteins operative in the degradation of poly(butylene succinate-co-butylene adipate; PBSA). Polymerase chain reaction analyses revealed a 1.5 kb fragment of the lipase gene (lip A) in B. cepacia PBSA-7 and Burkholderia sp. PBSA-9, while B. licheniformis PBSA-8 harbored the same gene fragment at 600 bp. The three strains possessed "Gly-X1-Ser-X2-Gly" and "Ala-X1-Ser-X2-Gly" lipase sequence regions. Burkholderia sp. PBSA-7 lip A displayed 36~40% homology with the family 1-1 lipases and 82~92% homology with the family 1-5. Burkholderia sp. PBSA-8 lip A was 64~65% homologous with the subfamily 1-4 lipases, but displayed no homology with the subfamily 1-5 lipases. Burkholderia sp. PBSA-9 lip A displayed 35~37% homology with the family I1 lipases and 83~94% homology with the family I2 lipases, similar to Burkholderia sp. PBSA-7.

우리나라 토양으로부터 분리된 (주와 김 2009) poly (butylene succinate-co-butylene adipate; PBSA) 분해균 Burkholderia cepacia PBSA-7, Bacillus licheniformis PBSA-8 및 Burkholderia sp. PBSA-9에서 PBSA 분해효소를 암호화하는 유전자를 분석하였다. PCR을 수행하여 B.cepacia PBSA-7과 Burkholderia sp. PBSA-9는 약 1.5 Kb, B. licheniformis PBSA-8은 약 600 bp의 lipase 유전자(lip A) 절편을 가지는 것을 확인하였다. 세 균주 모두에서 유전자의 염기서열 내 lipase box인 Gly-X1-Ser-X2-Gly와 Ala-X1-Ser-X2-Gly가 존재하였다. B. cepacia PBSA-7의 PBSA 분해효소 유전자는 family I-1 lipases와 36~40%, family I-2 lipases와는 82~92%의 높은 유전적 상동성을 보였다. 또한 B. licheniformis PBSA-8의 PBSA 분해효소 유전자는 subfamily 1-4 lipases와 64~65%의 유전적 상동성을 나타내었으나, subfamily 1-5에 속하는 lipase들과는 거의 유전적 상동성이 없는 것으로 나타났다. Burkholderia sp. PBSA-9의 PBSA 분해효소 유전자도 family I-1 lipases와 35~37%, family I-2 lipases와는 83~94%로 높은 유전적 상동성을 보여 B. cepacia PBSA-7의 PBSA 분해효소 유전자와 유사한 결과를 보였다.

Keywords

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