Structure of the Pyrococcus horikoshii CoA persulfide/polysulfide reductase

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 

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Structure and substrate specificity of the pyrococcal coenzyme A disulfide reductases/polysulfide reductases (CoADR/Psr): implications for S(0)-based respiration and a sulfur-dependent antioxidant system in Pyrococcus.

Herwald, S.Liu, A.Y.Zhu, B.E.Sea, K.W.Lopez, K.M.Sazinsky, M.H.Crane, E.J.

(2013) Biochemistry 52: 2764-2773

  • DOI: https://doi.org/10.1021/bi3014399
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    FAD and NAD(P)H-dependent coenzyme A disulfide reductases/polysulfide reductases (CoADR/Psr) have been proposed to be important for the reduction of sulfur and disulfides in the sulfur-reducing anaerobic hyperthermophiles Pyrococcus horikoshii and Pyrococcus furiosus; however, the form(s) of sulfur that the enzyme actually reduces are not clear. Here we determined the structure for the FAD- and coenzyme A-containing holoenzyme from P. horikoshii to 2.7 Å resolution and characterized its substrate specificity. The enzyme is relatively promiscuous and reduces a range of disulfide, persulfide, and polysulfide compounds. These results indicate that the likely in vivo substrates are NAD(P)H and di-, poly-, and persulfide derivatives of coenzyme A, although polysulfide itself is also efficiently reduced. The role of the enzyme in the reduction of elemental sulfur (S(8)) in situ is not, however, ruled out by these results, and the possible roles of this substrate are discussed. During aerobic persulfide reduction, rapid recycling of the persulfide substrate was observed, which is proposed to occur via sulfide oxidation by O(2) and/or H(2)O(2). As expected, this reaction disappears under anaerobic conditions and may explain observations by others that CoADR is not essential for S(0) respiration in Pyrococcus or Thermococcus but appears to participate in oxidative defense in the presence of S(0). When compared to the homologous Npsr enzyme from Shewanella loihica PV-4 and homologous enzymes known to reduce CoA disulfide, the phCoADR structure shows a relatively restricted substrate channel leading into the sulfur-reducing side of the FAD isoalloxazine ring, suggesting how this enzyme class may select for specific disulfide substrates.

  • Organizational Affiliation

    Department of Chemistry, Pomona College, 175 W. Sixth Street, Claremont, CA 91711, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coenzyme A disulfide reductase
A, B
453Pyrococcus horikoshii OT3Mutation(s): 0 
Gene Names: PH0572
EC: (PDB Primary Data), 1.8.1 (UniProt)
Find proteins for O58308 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Explore O58308 
Go to UniProtKB:  O58308
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO58308
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133.544α = 90
b = 133.544β = 90
c = 305.083γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description