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Title: SurR is a master regulator of the primary electron flow pathways in the order Thermococcales

Journal Article · · Molecular Microbiology
DOI: https://doi.org/10.1111/mmi.13668 · OSTI ID:1400621

Summary The sulfur response regulator, SurR, is among a handful of known redox‐active transcriptional regulators. First characterized from the hyperthermophile Pyrococcus furiosus , it is unique to the archaeal order Thermococcales. P. furiosus has two modes of electron disposal. Hydrogen gas is produced when the organism is grown in the absence of elemental sulfur (S 0 ) and H 2 S is produced when grown in its presence. Switching between these metabolic modes requires a rapid transcriptional response and this is orchestrated by SurR. We show here that deletion of SurR causes severely impaired growth in the absence of S 0 since genes essential for H 2 metabolism are no longer activated. Conversely, a strain containing a constitutively active SurR variant displays a growth phenotype in the presence of S 0 due to constitutive repression of S 0 ‐responsive genes. During a metabolic shift initiated by addition of S 0 to the growth medium, both strains demonstrate a de‐regulation of genes involved in the SurR regulon, including hydrogenase and related S 0 ‐responsive genes. These results demonstrate that SurR is a master regulator of electron flow within P. furiosus , likely affecting the pools of ferredoxin, NADPH and NADH, as well as influencing metabolic pathways and thiol/disulfide redox balance.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-08ER64690; FG05-95ER20175
OSTI ID:
1400621
Journal Information:
Molecular Microbiology, Journal Name: Molecular Microbiology Journal Issue: 5 Vol. 104; ISSN 0950-382X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
FAO
Language:
English

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