Solution structure of the flavodoxin-like domain from the Escherichia coli sulfite reductase

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 15 
  • Conformers Submitted: 15 
  • Selection Criteria: initial selection based on experimental energy target function 

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This is version 1.4 of the entry. See complete history


Solution Structure of the Sulfite Reductase Flavodoxin-like Domain from Escherichia coli

Sibille, N.Blackledge, M.Brutscher, B.Coves, J.Bersch, B.

(2005) Biochemistry 44: 9086-9095

  • DOI: https://doi.org/10.1021/bi050437p
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The flavoprotein moiety of Escherichia coli sulfite reductase (SiR-FP) is homologous to electron transfer proteins such as cytochrome-P450 reductase (CPR) or nitric oxide synthase (NOS). We report on the three-dimensional structure of SiR-FP18, the flavodoxin-like domain of SiR-FP, which has been determined by NMR. In the holoenzyme, this domain plays an important role by shuttling electrons from the FAD to the hemoprotein (the beta-subunit). The structure presented here was determined using distance and torsion angle information in combination with residual dipolar couplings determined in two different alignment media. Several protein-FMN NOEs allowed us to place the prosthetic group in its binding pocket. The structure is well-resolved, and (15)N relaxation data indicate that SiR-FP18 is a compact domain. The binding interface with cytochrome c, a nonphysiological electron acceptor, has been determined using chemical shift mapping. Comparison of the SiR-FP18 structure with the corresponding domains from CPR and NOS shows that the fold of the protein core is highly conserved, but the analysis of the electrostatic surfaces reveals significant differences between the three domains. These observations are placed in the physiological context so they can contribute to the understanding of the electron transfer mechanism in the SiR holoenzyme.

  • Organizational Affiliation

    Laboratoire de Résonance Magnétique Nucléaire, Institut de Biologie Structurale-Jean-Pierre Ebel, 41 rue Jules Horowitz, UMR 5075 CEA-CNRS-UJF, 38027 Grenoble Cedex 1, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sulfite reductase [NADPH] flavoprotein alpha-component167Escherichia coliMutation(s): 0 
Gene Names: cysJ
Find proteins for P38038 (Escherichia coli (strain K12))
Explore P38038 
Go to UniProtKB:  P38038
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38038
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FMN

Download Ideal Coordinates CCD File 
C17 H21 N4 O9 P
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 15 
  • Conformers Submitted: 15 
  • Selection Criteria: initial selection based on experimental energy target function 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-07-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-29
    Changes: Data collection