Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 95.96 kDa 
• Atom Count: 6,316 
• Modelled Residue Count: 775 
• Deposited Residue Count: 844 
• Unique protein chains: 1

 1TF5

Crystal structure of SecA in an open conformation from Bacillus Subtilis

• PDB DOI:  https://doi.org/10.2210/pdb1TF5/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2004-05-26 Released: 2004-08-03 
• Deposition Author(s): Osborne, A.R., Clemons Jr., W.M., Rapoport, T.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.18 Å
• R-Value Free: 0.273 
• R-Value Work: 0.241 
• R-Value Observed: 0.241 

Literature

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

• PubMed: 15256599 
• 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Preprotein translocase secA subunit	A	844	Bacillus subtilis	Mutation(s): 0  Gene Names: secA, div+, BSU35300 EC: 7.4.2.8 Membrane Entity: Yes
UniProt
Find proteins for P28366 (Bacillus subtilis (strain 168)) Explore P28366  Go to UniProtKB:  P28366

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 149.232	α = 90
b = 107.189	β = 94.96
c = 72.054	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-08-03 
Deposition Author(s): Osborne, A.R., Clemons Jr., W.M., Rapoport, T.A.

Revision History  

• 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