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Effects of the substituted amino acid residues on the thermal properties of monomeric isocitrate dehydrogenases from a psychrophilic bacterium, Psychromonas marina, and a mesophilic bacterium, Azotobacter vinelandii

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Title: Effects of the substituted amino acid residues on the thermal properties of monomeric isocitrate dehydrogenases from a psychrophilic bacterium, Psychromonas marina, and a mesophilic bacterium, Azotobacter vinelandii
Authors: Tsubouchi, Kango Browse this author
Takada, Yasuhiro Browse this author →KAKEN DB
Keywords: Cold-adapted isocitrate dehydrogenase
Mesophilic isocitrate dehydrogenase
Site-directed mutagenesis
Psychromonas marina
Azotobacter vinelandii
Issue Date: Nov-2019
Publisher: Springer
Journal Title: Extremophiles
Volume: 23
Issue: 6
Start Page: 809
End Page: 820
Publisher DOI: 10.1007/s00792-019-01137-0
Abstract: A cold-adapted monomeric isocitrate dehydrogenase from a psychrophilic bacterium, Psychromonas marina (PmIDH), showed a high degree of amino acid sequential identity (64%) to a mesophilic one from a mesophilic bacterium, Azotobacter vinelandii (AvIDH). In this study, eight corresponding amino acid residues were substituted between them by site-directed mutagenesis, and several thermal properties of the mutated IDHs were examined. In the PmIDH mutants, PmL735F, substituted Leu735 of PmIDH by the corresponding Phe of AvIDH, showed higher specific activity and thermostability of activity than wild-type PmIDH, while the H600Y and N741P mutations of PmIDH resulted in decreased specific activity and thermostability of activity. On the other hand, among the AvIDH mutants, AvP718T showed lower optimum temperature and thermostability of activity than wild-type AvIDH. In PmIDH variously combined the H600Y, L735F and N741P mutations, PmH600YL735F, including the H600Y and L735F mutations, showed higher specific activity than PmH600Y and similar optimum temperature and thermostability of activity to PmH600Y. Furthermore, PmL735FN741P exhibited higher specific activity and thermostability of activity than PmN741P. These results indicated that the effects of the three mutations of PmIDH are additive on the specific activity of both PmH600YL735F and PmL735FN741P and on thermostability of PmL735FN741P.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Extremophiles. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00792-019-01137-0
Type: article (author version)
URI: http://hdl.handle.net/2115/79668
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高田 泰弘

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