한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제23권4호
  • /
  • Pages.446-453
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  • 1995
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

재조합 균주 Escherichia coli가 생산하는 Bacillus stearothermophilus $\alpha$-L-Arabinofuranosidase의 정제 및 특성

Purification and characterzation of the $\alpha$-L-Arabinofuranosidase from Escherichia coli Cells Harboring the Recombinant Plasmid pKMG11

  • 엄수정 (고려대학교 자연자원대학 유전공학과) ;
  • 조쌍구 (고려대학교 자연자원대학 유전공학과) ;
  • 최용진 (고려대학교 자연자원대학 유전공학과)
  • 발행 : 1995.08.01
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초록

$\alpha $-Arabinofuranosidase was produced by E. coli HB101 haboring the recombinant plasmid pKMG11 which contained the arfI gene of Bacillus stearothermophilus. The maximum production of the enzyme was observed when E. coli HB101 cells were grown at 37$\circ$C for 20 hours in the medium containing 0.5% arabinose, 1.0% tryptone, 0.5% yeast extract, and 1% NaCl. The $\ALPHA $-arabinofuranosidase produced was purified to homogeneity using a combination of 20-50% ammonium sulfate precipitation, DEAE-Sepharose CL-6B ion exchange column chromatography and Sepharose 6B-100 gel filtration. The purified enzyme was most active at 55$\circ$C and pH 6.5. The K$_{m}$ and V$_{max}$ values of the enzyme on $\rho $-nitrophenyl-$\alpha $-arabinofuranoside was determined to be 2.99 mM and 0.43 $\mu $mole/min (319.74 $\mu $mole/min/mg), respectively. The pI value was 4.5. The molecular weight of the native protein was estimated to be 289 kDa. The SDS-polyacrylamide gel clectrophoresis analysis suggested that the functional protein was a trimer of the 108 kDa identical subunits. The N-terminal amino acid sequence of the a-arabinofuranosidase was identified as X-Ser-Thr-Ala-Pro-Arg( \ulcorner )-Ala-Thr-Met-Val-Ile-Asp-X-Ala-Phe.

키워드

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