TY  - JOUR
A1  - Jain, Surbhi
A1  - Katsyv, Alexander
A1  - Basen, Mirko
A1  - Müller, Volker
T1  - The monofunctional CO dehydrogenase CooS is essential for growth of Thermoanaerobacter kivui on carbon monoxide
T2  - Extremophiles
N2  - Thermoanaerobacter kivui is a thermophilic acetogen that can grow on carbon monoxide as sole carbon and energy source. To identify the gene(s) involved in CO oxidation, the genome sequence was analyzed. Two genes potentially encoding CO dehydrogenases were identified. One, cooS, potentially encodes a monofunctional CO dehydrogenase, whereas another, acsA, potentially encodes the CODH component of the CODH/ACS complex. Both genes were cloned, a His-tag encoding sequence was added, and the proteins were produced from a plasmid in T. kivui. His-AcsA copurified by affinity chromatography with AcsB, the acetyl-CoA synthase of the CO dehydrogenase/acetyl CoA synthase complex. His-CooS copurified with CooF1, a small iron-sulfur center containing protein likely involved in electron transport. Both protein complexes had CO:ferredoxin oxidoreductase as well as CO:methyl viologen oxidoreductase activity, but the activity of CooSF1 was 15-times and 231-times lower, respectively. To underline the importance of CooS, the gene was deleted in the CO-adapted strain. Interestingly, the ∆cooS deletion mutant did not grow on CO anymore. These experiments clearly demonstrated that CooS is essential for growth of T. kivui on CO. This is in line with the hypothesis that CooS is the CO-oxidizing enzyme in cells growing on CO.
KW  - Biofuels
KW  - Thermophilic acetogenic bacteria
KW  - Wood–Ljungdahl pathway
KW  - Synthesis gas
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/69579
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-695793
SN  - 1433-4909
N1  - Open Access funding enabled and organized by Projekt DEAL.
N1  - We are obliged to the BMBF (ThermoSynCon, grant no.: 031B0857B) for the continuous support.
VL  - 26
IS  - 1, art. 4
SP  - 1
EP  - 12
PB  - Springer
CY  - Tokyo
ER  -