1TF5 image
Entry Detail
PDB ID:
1TF5
Keywords:
PROTEIN TRANSPORT
Title:
Crystal structure of SecA in an open conformation from Bacillus Subtilis
Biological Source:
Source Organism:
Bacillus subtilis
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2004-05-26
Release Date:
2004-08-03
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.18 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
C 1 2 1
1TF5 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Preprotein translocase secA subunit
Chain IDs:A
Chain Length:844
Number of Molecules:1
Biological Source:Bacillus subtilis
UniProt ID:P28366 Pfam ID:PF07517, PF01043, PF21090, PF07516, PF02810 EC:7.4.2.5
Primary Citation
A large conformational change of the translocation ATPase SecA.
Proc.Natl.Acad.Sci.USA 101 10937 10942 (2004)
PMID: 15256599 DOI: 10.1073/pnas.0401742101

Abstact

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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Primary Citation of related structures
1TF2