Characterization of Two Biphenyl Dioxygenases for Biphenyl/PCB Degradation in A PCB Degrader, Rhodococcus sp. Strain RHA1
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概要
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Rhodococcus sp. RHA1 induces two biphenyl dioxygenases, the BphA and EtbA/EbdA dioxygenases, during growth on biphenyl. Their subunit genes were expressed in R. erythropolis IAM1399 to investigate the involvement of each subunit gene in their activity and their substrate preferences. The recombinant expressing ebdA1A2A3etbA4 and that expressing bphA1A2A3A4 exhibited 4-chlorobiphenyl (4-CB) transformation activity, suggesting that these gene sets are responsible for the EtbA/EbdA and BphA dioxygenases respectively. When bphA4 and etbA4 were swapped to construct the recombinants expressing ebdA1A2A3bphA4 and bphA1A2A3etbA4 respectively, compatibility between BphA4 and EtbA4 was suggested by their 4-CB transformation activities. When bphA3 and ebdA3 were swapped, incompatibility between BphA3 and EbdA3 was suggested. BphA and EtbA/EbdA dioxygenases exhibited the highest transformation activity toward biphenyl and naphthalene respectively, and also attacked dibenzofuran and dibenzo-p-dioxin. The wide substrate preference of EtbA/EbdA dioxygenase suggested that it plays a more important role in polychlorinated biphenyl (PCB) degradation than does BphA dioxygenase.
- 社団法人 日本農芸化学会の論文
著者
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MASAI Eiji
Department of Bioengineering, Nagaoka University of Technology
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Fukuda Masao
Department Of Bioengineering Nagaoka University Of Technology
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TAKEDA Hisashi
Department of Biophysical Genetics, Kanazawa University Graduate School of Medicine
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MIYAUCHI Keisuke
Department of Civil and Environmental Engineering, Tohoku Gakuin University
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IWASAKI Takumi
Department of Bioengineering, Nagaoka University of Technology
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YAMADA Tadakazu
Sugiyama Chemical and Industrial Laboratory
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