Crystal structure of partially reduced Bacillus anthracis CoADR-RHD

Experimental Data Snapshot

  • Resolution: 1.94 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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Crystal structure and catalytic properties of Bacillus anthracis CoADR-RHD: implications for flavin-linked sulfur trafficking.

Wallen, J.R.Mallett, T.C.Boles, W.Parsonage, D.Furdui, C.M.Karplus, P.A.Claiborne, A.

(2009) Biochemistry 48: 9650-9667

  • DOI: https://doi.org/10.1021/bi900887k
  • Primary Citation of Related Structures:  
    3ICR, 3ICS, 3ICT

  • PubMed Abstract: 

    Rhodanese homology domains (RHDs) play important roles in sulfur trafficking mechanisms essential to the biosynthesis of sulfur-containing cofactors and nucleosides. We have now determined the crystal structure at 2.10 A resolution for the Bacillus anthracis coenzyme A-disulfide reductase isoform (BaCoADR-RHD) containing a C-terminal RHD domain; this is the first structural representative of the multidomain proteins class of the rhodanese superfamily. The catalytic Cys44 of the CoADR module is separated by 25 A from the active-site Cys514' of the RHD domain from the complementary subunit. In stark contrast to the B. anthracis CoADR [Wallen, J. R., Paige, C., Mallett, T. C., Karplus, P. A., and Claiborne, A. (2008) Biochemistry 47, 5182-5193], the BaCoADR-RHD isoform does not catalyze the reduction of coenzyme A-disulfide, although both enzymes conserve the Cys-SSCoA redox center. NADH titrations have been combined with a synchrotron reduction protocol for examination of the structural and redox behavior of the Cys44-SSCoA center. The synchrotron-reduced (Cys44 + CoASH) structure reveals ordered binding for the adenosine 3'-phosphate 5'-pyrophosphate moiety of CoASH, but the absence of density for the pantetheine arm indicates that it is flexible within the reduced active site. Steady-state kinetic analyses with the alternate disulfide substrates methyl methanethiolsulfonate (MMTS) and 5,5'-dithiobis(2-nitrobenzoate) (DTNB), including the appropriate Cys --> Ser mutants, demonstrate that MMTS reduction occurs within the CoADR active site. NADH-dependent DTNB reduction, on the other hand, requires communication between Cys44 and Cys514', and we propose that reduction of the Cys44-SSCoA disulfide promotes the transfer of reducing equivalents to the RHD, with the swinging pantetheine arm serving as a ca. 20 A bridge.

  • Organizational Affiliation

    Department of Internal Medicine, Wake Forest University Schoolof Medicine, Center for Structural Biology, Winston-Salem, North Carolina 27157, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coenzyme A-Disulfide Reductase
A, B
588Bacillus anthracis str. AmesMutation(s): 0 
Gene Names: BA0774BAS0736BA_0774GBAA_0774
Find proteins for A0A6L7H7X4 (Bacillus anthracis)
Explore A0A6L7H7X4 
Go to UniProtKB:  A0A6L7H7X4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A6L7H7X4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.94 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.37α = 90
b = 110.47β = 101.87
c = 80.02γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.3: 2023-11-22
    Changes: Data collection