CIESC Journal ›› 2011, Vol. 19 ›› Issue (4): 644-648.

• • 上一篇    下一篇

Purification and Characterization of a Nonylphenol(NP)-degrading Enzyme from Bacillus cereus.Frankland

杨革1,2, 张营1, 白艳芬2   

  1. 1. College of Textiles Tianjin Polytechnic University, Tianjin 300160, China;
    2. Key Lab of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
  • 收稿日期:2010-04-07 修回日期:2011-04-18 出版日期:2011-08-28 发布日期:2011-08-28
  • 通讯作者: YANG Ge,E-mail:yangge100@126.com
  • 基金资助:
    Supported by the Fund of Open Subject of Key Lab of Biogeology and Environmental Geology of Ministry of Education(BGEG1006)

Purification and Characterization of a Nonylphenol(NP)-degrading Enzyme from Bacillus cereus.Frankland

YANG Ge1,2, ZHANG Ying1, BAI Yanfen2   

  1. 1. College of Textiles Tianjin Polytechnic University, Tianjin 300160, China;
    2. Key Lab of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
  • Received:2010-04-07 Revised:2011-04-18 Online:2011-08-28 Published:2011-08-28
  • Supported by:
    Supported by the Fund of Open Subject of Key Lab of Biogeology and Environmental Geology of Ministry of Education(BGEG1006)

摘要: Abstract>An extracellular NP-degrading enzyme secreted by Bacillus cereus.Frankland was purified to homogeneity by a combination of ammonium sulfate precipitation, Phenyl-Sepharose hydrophobic-interaction chromatography and DEAE anion-exchange chromatography.On SDS(sodium dodecyl sulfate)-polyacrylamide gel electrophoresis analysis, the purified enzyme showed a relative molecular mass of 58.3 kDa.The depolymerzation of subunits was accompanied with the loss of NP-degrading enzyme activity, and removing denaturing factors by dialysis could restore the dimer structure and enzymatic activity.The enzyme had an isoelectric point of 5.5 and an optimal temperature of 60℃, and was the most active at pH 6.0.The enzymatic activity was stable at pH 4-8 and inhibited by Cu2+.TenN-terminal amino acids were determined to be ASVNSIKIGY, demonstrating that the purified enzyme was a novel one.The hydrolysis pattern of the purified enzyme indicated that the NP-degrading enzyme was an endo NP-degrading enzyme.The extraordinary thermo-stability provided the enzyme with a good prospect to be used as a new tool for clean-production process for textile industry.

关键词: nonylphenol(NP), Bacillus cereus.Frankland, NP-degrading enzyme, purification, characterization

Abstract: Abstract>An extracellular NP-degrading enzyme secreted by Bacillus cereus.Frankland was purified to homogeneity by a combination of ammonium sulfate precipitation, Phenyl-Sepharose hydrophobic-interaction chromatography and DEAE anion-exchange chromatography.On SDS(sodium dodecyl sulfate)-polyacrylamide gel electrophoresis analysis, the purified enzyme showed a relative molecular mass of 58.3 kDa.The depolymerzation of subunits was accompanied with the loss of NP-degrading enzyme activity, and removing denaturing factors by dialysis could restore the dimer structure and enzymatic activity.The enzyme had an isoelectric point of 5.5 and an optimal temperature of 60℃, and was the most active at pH 6.0.The enzymatic activity was stable at pH 4-8 and inhibited by Cu2+.TenN-terminal amino acids were determined to be ASVNSIKIGY, demonstrating that the purified enzyme was a novel one.The hydrolysis pattern of the purified enzyme indicated that the NP-degrading enzyme was an endo NP-degrading enzyme.The extraordinary thermo-stability provided the enzyme with a good prospect to be used as a new tool for clean-production process for textile industry.

Key words: nonylphenol(NP), Bacillus cereus.Frankland, NP-degrading enzyme, purification, characterization