Molecular Cloning and Expression of the Acetyl Xylan Esterase Gene(estII) of Bacillus Stearothermophilus in Escherichia coli

Bacillus stearothermophilus Acetyl Exterase 유전자(estII)의 클로닝과 Escherichia coli에서의 발현

  • Kim, Hee-Sun ;
  • Eom, Soo-Jung ;
  • Cho, Ssang-Goo ;
  • Choi, Yong-Jin
  • 김희선 (고려대학교 유전공학과) ;
  • 엄수정 (고려대학교 유전공학과) ;
  • 조쌍구 (고려대학교 유전공학과) ;
  • 최용진 (고려대학교 유전공학과)
  • Published : 1994.12.01

Abstract

Bacillus stearothermomophilus, a strong xylan degrader, was confirmed to express multiple esterase activities in addition to the major xylanolytic enzymes. One of the genes encoding the esterases was isolated from the genomic library of B. stearothermophilus constructed with EcoRl restriction endonuclease and pBR322 plasmid. Three recombinant plasmids showing the tributyrin degrading activity were selected from approximately 7, 000 E. coli HB101 transformants, and were found to have the same insert of a 3.2 kb DNA fragment. Restriction mapping and hybridization studies revealed that the gene(estII) on the hybrid plasmid (pKMG7) had originated from the B. stearothermophilus chromosome, and was distinct from the estl, another esterase gene of B. stearothermophilus isolated in the previous work. The E. coli cells harboring pKMG7 produced an acetylxylan esterase that exibited similar substrate specificity to the esterase encoded by the estI gene.

Keywords

Acetyl xylan esterase;Bacillus stearother-morphilus;molecular cloning

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