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- Title
Characterization of a cryptic, pyrroloquinoline quinone-dependent dehydrogenase of Gluconobacter sp. strain CHM43.
- Authors
Nguyen, Thuy Minh; Naoki, Kotone; Kataoka, Naoya; Matsutani, Minenosuke; Ano, Yoshitaka; Adachi, Osao; Matsushita, Kazunobu; Yakushi, Toshiharu
- Abstract
We characterized the pyrroloquinoline quinone (PQQ)-dependent dehydrogenase 9 (PQQ-DH9) of Gluconobacter sp. strain CHM43, which is a homolog of PQQ-dependent glycerol dehydrogenase (GLDH). We used a plasmid construct to express PQQ-DH9. The expression host was a derivative strain of CHM43, which lacked the genes for GLDH and the membrane-bound alcohol dehydrogenase and consequently had minimal ability to oxidize primary and secondary alcohols. The membranes of the transformant exhibited considerable d -arabitol dehydrogenase activity, whereas the reference strain did not, even if it had PQQ-DH9-encoding genes in the chromosome and harbored the empty vector. This suggests that PQQ-DH9 is not expressed in the genome. The activities of the membranes containing PQQ-DH9 and GLDH suggested that similar to GLDH, PQQ-DH9 oxidized a wide variety of secondary alcohols but had higher Michaelis constants than GLDH with regard to linear substrates such as glycerol. Cyclic substrates such as cis -1,2-cyclohexanediol were readily oxidized by PQQ-DH9.
- Subjects
PQQ (Biochemistry); ALCOHOL dehydrogenase; ACETOBACTER; CHROMOSOMES
- Publication
Bioscience, Biotechnology & Biochemistry, 2021, Vol 85, Issue 4, p998
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1093/bbb/zbab005