Novel, Oxygen-Insensitive Group 5 [NiFe]-Hydrogenase in Ralstonia eutropha
نویسندگان
چکیده
منابع مشابه
Enhanced Oxygen-Tolerance of the Full Heterotrimeric Membrane-Bound [NiFe]-Hydrogenase of Ralstonia eutropha
Hydrogenases are oxygen-sensitive enzymes that catalyze the conversion between protons and hydrogen. Water-soluble subcomplexes of membrane-bound [NiFe]-hydrogenases (MBH) have been extensively studied for applications in hydrogen-oxygen fuel cells as they are relatively tolerant to oxygen, although even these catalysts are still inactivated in oxidative conditions. Here, the full heterotrimeri...
متن کاملCatalytic Properties of the Isolated Diaphorase Fragment of the NAD+-Reducing [NiFe]-Hydrogenase from Ralstonia eutropha
The NAD+-reducing soluble hydrogenase (SH) from Ralstonia eutropha H16 catalyzes the H₂-driven reduction of NAD+, as well as reverse electron transfer from NADH to H+, in the presence of O₂. It comprises six subunits, HoxHYFUI₂, and incorporates a [NiFe] H+/H₂ cycling catalytic centre, two non-covalently bound flavin mononucleotide (FMN) groups and an iron-sulfur cluster relay for electron tran...
متن کاملInvolvement of hyp gene products in maturation of the H(2)-sensing [NiFe] hydrogenase of Ralstonia eutropha.
The biosynthesis of [NiFe] hydrogenases is a complex process that requires the function of the Hyp proteins HypA, HypB, HypC, HypD, HypE, HypF, and HypX for assembly of the H(2)-activating [NiFe] site. In this study we examined the maturation of the regulatory hydrogenase (RH) of Ralstonia eutropha. The RH is a H(2)-sensing [NiFe] hydrogenase and is required as a constituent of a signal transdu...
متن کاملThe auxiliary protein HypX provides oxygen tolerance to the soluble [NiFe]-hydrogenase of ralstonia eutropha H16 by way of a cyanide ligand to nickel.
The hypX gene of the facultative lithoautotrophic bacterium Ralstonia eutropha is part of a cassette of accessory genes (the hyp cluster) required for the proper assembly of the active site of the [NiFe]-hydrogenases in the bacterium. A deletion of the hypX gene led to a severe growth retardation under lithoautotrophic conditions with 5 or 15% oxygen, when the growth was dependent on the activi...
متن کاملDirect detection of a hydrogen ligand in the [NiFe] center of the regulatory H2-sensing hydrogenase from Ralstonia eutropha in its reduced state by HYSCORE and ENDOR spectroscopy.
The regulatory H2-sensing [NiFe] hydrogenase of the beta-proteobacterium Ralstonia eutropha displays an Ni-C "active" state after reduction with H2 that is very similar to the reduced Ni-C state of standard [NiFe] hydrogenases. Pulse electron nuclear double resonance (ENDOR) and four-pulse ESEEM (hyperfine sublevel correlation, HYSCORE) spectroscopy are applied to obtain structural information ...
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ژورنال
عنوان ژورنال: Applied and Environmental Microbiology
سال: 2013
ISSN: 0099-2240,1098-5336
DOI: 10.1128/aem.01576-13