1M6N

Crystal structure of the SecA translocation ATPase from Bacillus subtilis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Nucleotide Control of Interdomain Interactions in the Conformational Reaction Cycle of SecA

Hunt, J.F.Weinkauf, S.Henry, L.Fak, J.J.McNicholas, P.Oliver, D.B.Deisenhofer, J.

(2002) Science 297: 2018-2026

  • DOI: 10.1126/science.1074424
  • Primary Citation of Related Structures:  1M74

  • PubMed Abstract: 
  • The SecA adenosine triphosphatase (ATPase) mediates extrusion of the amino termini of secreted proteins from the eubacterial cytosol based on cycles of reversible binding to the SecYEG translocon. We have determined the crystal structure of SecA with ...

    The SecA adenosine triphosphatase (ATPase) mediates extrusion of the amino termini of secreted proteins from the eubacterial cytosol based on cycles of reversible binding to the SecYEG translocon. We have determined the crystal structure of SecA with and without magnesium-adenosine diphosphate bound to the high-affinity ATPase site at 3.0 and 2.7 angstrom resolution, respectively. Candidate sites for preprotein binding are located on a surface containing the SecA epitopes exposed to the periplasm upon binding to SecYEG and are thus positioned to deliver preprotein to SecYEG. Comparisons with structurally related ATPases, including superfamily I and II ATP-dependent helicases, suggest that the interaction geometry of the tandem motor domains in SecA is modulated by nucleotide binding, which is shown by fluorescence anisotropy experiments to reverse an endothermic domain-dissociation reaction hypothesized to gate binding to SecYEG.


    Related Citations: 
    • Conformational stabilization and crystallization of the SecA translocation ATPase from Bacillus subtilis
      Weinkauf, S.,Hunt, J.F.,Scheuring, J.,Henry, L.,Fak, J.J.,Oliver, D.B.,Deisenhofer, J.
      (2001) Acta Crystallogr.,Sect.D 57: 559
    • Ping-pong cross-validation in real space: a method to increase the phasing power of a partial model without risk of phase bias
      Hunt, J.F.,Deisenhofer, J.
      (2002) TO BE PUBLISHED --: --


    Organizational Affiliation

    Department of Biological Sciences, 702A Fairchild Center, MC2434, Columbia University, New York, NY 10027, USA. hunt@sid.bio.columbia.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Preprotein translocase secA
A
802Bacillus subtilis (strain 168)Gene Names: secA (div+)
Find proteins for P28366 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P28366
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.220 
  • Space Group: P 31 1 2
Unit Cell:
Length (Å)Angle (°)
a = 130.833α = 90.00
b = 130.833β = 90.00
c = 150.350γ = 120.00
Software Package:
Software NamePurpose
X-PLORrefinement
DMphasing
DENZOdata reduction
DMmodel building
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-09-20
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance