Abstract
Two iron-containing alcohol dehydrogenases (ADHs) are encoded in the genome of the hyperthermophilic euryarchaeon Thermococcus barophilus Ch5 (Tba ADH641 and Tba ADH547). In our previous publication, we reported biochemical characteristics and catalytic mechanism of Tba ADH547. Herein, we present evidence that Tba ADH641 possesses two activities for ethanol oxidization and acetaldehyde reduction at high temperature, capable of using NAD(H) and NADP(H) as coenzyme. Biochemical data show that Tba ADH641 possesses optimal reaction temperature, thermostability, divalent ion requirement, and substrate specificity distinct from Tba ADH547 and other iron-containing ADH homologues. However, Tba ADH641 and Tba ADH547 display same optimal reaction pH. Kinetic analyses demonstrate that Tba ADH641 displays higher catalytic efficiency for acetaldehyde reduction than that for ethanol oxidation, which is consistent with Tba ADH547. Mutational data demonstrate that residues D115, K118, E159, D190, and E215 in Tba ADH641, which has not been described to date, are necessary for enzyme activity, thus augmenting our understanding on catalytic mechanism of iron-containing ADH. Overall, our work demonstrates that Tba ADH641 is an iron-containing ADH with novel features, which is distinct from Tba ADH547, thus providing a potential biocatalyst for biotransformation reaction.
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Acknowledgements
We thank Prof. Philippe Oger at Université de Lyon, INSA de Lyon, for providing the genomic DNA of T. barophilus Ch5.
Funding
This work was supported by the Natural Science Foundation of Jiangsu Province (No. BK20191219), High Level Talent Support Program of Yangzhou University and the Academic Leader of Middle and Young People of Yangzhou University Grant to L.Z, and the Postgraduate Practice Innovation Grant of Jiangsu Province, China (No. SJCX21_1572) to L.W.
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LZ designed experiments; LW performed experiments; LZ and LW analyzed data; and LZ wrote and revised the paper.
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Wu, L., Zhang, L. Biochemical and Functional Characterization of an Iron-Containing Alcohol Dehydrogenase from Thermococcus barophilus Ch5. Appl Biochem Biotechnol 194, 5537–5555 (2022). https://doi.org/10.1007/s12010-022-04052-x
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DOI: https://doi.org/10.1007/s12010-022-04052-x