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Reversible and Selective Interconversion of Hydrogen and Carbon Dioxide into Formate by a Semiartificial Formate Hydrogenlyase Mimic.

ABSTRACT: The biological formate hydrogenlyase (FHL) complex links a formate dehydrogenase (FDH) to a hydrogenase (H₂ase) and produces H₂ and CO₂ from formate via mixed-acid fermentation in Escherichia coli. Here, we describe an electrochemical and a colloidal semiartificial FHL system that consists of an FDH and a H₂ase immobilized on conductive indium tin oxide (ITO) as an electron relay. These in vitro systems benefit from the efficient wiring of a highly active enzyme pair and allow for the reversible conversion of formate to H₂ and CO₂ under ambient temperature and pressure. The hybrid systems provide a template for the design of synthetic catalysts and surpass the FHL complex in vivo by storing and releasing H₂ on demand by interconverting CO₂/H₂ and formate with minimal bias in either direction.

SUBMITTER: Sokol KP

PROVIDER: S-EPMC6838786 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Reversible and Selective Interconversion of Hydrogen and Carbon Dioxide into Formate by a Semiartificial Formate Hydrogenlyase Mimic.

Sokol Katarzyna P KP Robinson William E WE Oliveira Ana R AR Zacarias Sonia S Lee Chong-Yong CY Madden Christopher C Bassegoda Arnau A Hirst Judy J Pereira Inês A C IAC Reisner Erwin E

Journal of the American Chemical Society 20191028 44

The biological formate hydrogenlyase (FHL) complex links a formate dehydrogenase (FDH) to a hydrogenase (H2ase) and produces H2 and CO2 from formate via mixed-acid fermentation in Escherichia coli. Here, we describe an electrochemical and a colloidal semiartificial FHL system that consists of an FDH and a H2ase immobilized on conductive indium tin oxide (ITO) as an electron relay. These in vitro systems benefit from the efficient wiring o ...[more]

PMID: 31638793

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Project description:Trabulsiella guamensis is a nonpathogenic enterobacterium that was isolated from a vacuum cleaner on the island of Guam. It has one H2-oxidizing Hyd-2-type hydrogenase (Hyd) and encodes an H2-evolving Hyd that is most similar to the uncharacterized Escherichia coli formate hydrogenlyase (FHL-2 Ec ) complex. The T. guamensis FHL-2 (FHL-2 Tg ) complex is predicted to have 5 membrane-integral and between 4 and 5 cytoplasmic subunits. We showed that the FHL-2 Tg complex catalyzes the disproportionation of formate to CO2 and H2 FHL-2 Tg has activity similar to that of the E. coli FHL-1 Ec complex in H2 evolution from formate, but the complex appears to be more labile upon cell lysis. Cloning of the entire 13-kbp FHL-2 Tg operon in the heterologous E. coli host has now enabled us to unambiguously prove FHL-2 Tg activity, and it allowed us to characterize the FHL-2 Tg complex biochemically. Although the formate dehydrogenase (FdhH) gene fdhF is not contained in the operon, the FdhH is part of the complex, and FHL-2 Tg activity was dependent on the presence of E. coli FdhH. Also, in contrast to E. coli, T. guamensis can ferment the alternative carbon source cellobiose, and we further investigated the participation of both the H2-oxidizing Hyd-2 Tg and the H2-forming FHL-2 Tg under these conditions.IMPORTANCE Biological H2 production presents an attractive alternative for fossil fuels. However, in order to compete with conventional H2 production methods, the process requires our understanding on a molecular level. FHL complexes are efficient H2 producers, and the prototype FHL-1 Ec complex in E. coli is well studied. This paper presents the first biochemical characterization of an FHL-2-type complex. The data presented here will enable us to solve the long-standing mystery of the FHL-2 Ec complex, allow a first biochemical characterization of T. guamensis's fermentative metabolism, and establish this enterobacterium as a model organism for FHL-dependent energy conservation.

Dataset Information

Reversible and Selective Interconversion of Hydrogen and Carbon Dioxide into Formate by a Semiartificial Formate Hydrogenlyase Mimic.

Publications

Reversible and Selective Interconversion of Hydrogen and Carbon Dioxide into Formate by a Semiartificial Formate Hydrogenlyase Mimic.

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