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Mutational Analyses of the Enzymes Involved in the Metabolism of Hydrogen by the Hyperthermophilic Archaeon Pyrococcus furiosus

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [2];  [3];  [2]
  1. Univ. of Georgia, Athens, GA (United States). Dept. of Biochemistry and Molecular Biology; DOE/OSTI
  2. Univ. of Georgia, Athens, GA (United States). Dept. of Biochemistry and Molecular Biology
  3. Univ. of Georgia, Athens, GA (United States). Dept. of Biochemistry and Molecular Biology; Univ. of Georgia, Athens, GA (United States). Dept. of Chemistry
Pyrococcus furiosus grows optimally near 100°C by fermenting carbohydrates to produce hydrogen (H2) or, if elemental sulfur (S0) is present, hydrogen sulfide instead. It contains two cytoplasmic hydrogenases, SHI and SHII, that use NADP(H) as an electron carrier and a membrane-bound hydrogenase (MBH) that utilizes the redox protein ferredoxin. We previously constructed deletion strains lacking SHI and/or SHII and showed that they exhibited no obvious phenotype. This study has now been extended to include biochemical analyses and growth studies using the ΔSHI and ΔSHII deletion strains together with strains lacking a functional MBH (ΔmbhL). Hydrogenase activity in cytoplasmic extracts of various strains demonstrate that SHI is responsible for most of the cytoplasmic hydrogenase activity. The ΔmbhL strain showed no growth in the absence of S0, confirming the hypothesis that, in the absence of S0, MBH is the only enzyme that can dispose of reductant (in the form of H2) generated during sugar oxidation. Under conditions of limiting sulfur, a small but significant amount of H2 was produced by the ΔmbhL strain, showing that SHI can produce H2 from NADPH in vivo, although this does not enable growth of ΔmbhL in the absence of S0. We propose that the physiological function of SHI is to recycle H2 and provide a link between external H2 and the intracellular pool of NADPH needed for biosynthesis. This likely has a distinct energetic advantage in the environment, but it is clearly not required for growth of the organism under the usual laboratory conditions. The function of SHII, however, remains unknown.
Research Organization:
Univ. of Georgia, Athens, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-08ER64690
OSTI ID:
1628061
Journal Information:
Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 3; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

High hydrostatic pressure adaptive strategies in an obligate piezophile Pyrococcus yayanosii journal June 2016
Role of Mn 2+ and Compatible Solutes in the Radiation Resistance of Thermophilic Bacteria and Archaea journal January 2012
The modern “3G” age of archaeal molecular biology journal January 2012
NADPH-generating systems in bacteria and archaea journal July 2015
Overproduction of the membrane-bound [NiFe]-hydrogenase in Thermococcus kodakarensis and its effect on hydrogen production journal August 2015
Proteomic Insights into Sulfur Metabolism in the Hydrogen-Producing Hyperthermophilic Archaeon Thermococcus onnurineus NA1 journal April 2015
Additional file 1 of Sulfur-cycling chemolithoautotrophic microbial community dominates a cold, anoxic, hypersaline Arctic spring dataset January 2023
Engineering Hydrogen Gas Production from Formate in a Hyperthermophile by Heterologous Production of an 18-Subunit Membrane-bound Complex journal December 2013
Two functionally distinct NADP + -dependent ferredoxin oxidoreductases maintain the primary redox balance of Pyrococcus furiosus journal July 2017
Characterization of membrane-bound sulfane reductase: A missing link in the evolution of modern day respiratory complexes journal September 2018
Molecular Hydrogen, a Neglected Key Driver of Soil Biogeochemical Processes journal January 2019
Carbohydrate Metabolism in Archaea: Current Insights into Unusual Enzymes and Pathways and Their Regulation journal March 2014

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