Crystal structure of SecA in an open conformation from Bacillus Subtilis

Experimental Data Snapshot

  • Resolution: 2.18 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 

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This is version 1.3 of the entry. See complete history


A large conformational change of the translocation ATPase SecA.

Osborne, A.R.Clemons Jr., W.M.Rapoport, T.A.

(2004) Proc Natl Acad Sci U S A 101: 10937-10942

  • DOI: https://doi.org/10.1073/pnas.0401742101
  • Primary Citation of Related Structures:  
    1TF2, 1TF5

  • PubMed Abstract: 

    The ATPase SecA mediates the posttranslational translocation of a wide range of polypeptide substrates through the SecY channel in the cytoplasmic membrane of bacteria. We have determined the crystal structure of a monomeric form of Bacillus subtilis SecA at a 2.2-A resolution. A comparison with the previously determined structures of SecA reveals a nucleotide-independent, large conformational change that opens a deep groove similar to that in other proteins that interact with diverse polypeptides. We propose that the open form of SecA represents an activated state.

  • Organizational Affiliation

    Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Preprotein translocase secA subunit844Bacillus subtilisMutation(s): 0 
Gene Names: SECADIV+BSU35300
Membrane Entity: Yes 
Find proteins for P28366 (Bacillus subtilis (strain 168))
Explore P28366 
Go to UniProtKB:  P28366
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28366
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.18 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.232α = 90
b = 107.189β = 94.96
c = 72.054γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-08-03
    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: 2023-08-23
    Changes: Data collection, Database references, Refinement description