2ZQP

Crystal Structure of SecYE translocon from Thermus thermophilus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.00 Å
  • R-Value Free: 0.445 
  • R-Value Work: 0.407 
  • R-Value Observed: 0.409 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Conformational transition of Sec machinery inferred from bacterial SecYE structures

Tsukazaki, T.Mori, H.Fukai, S.Ishitani, R.Mori, T.Dohmae, N.Perederina, A.Sugita, Y.Vassylyev, D.G.Ito, K.Nureki, O.

(2008) Nature 455: 988-991

  • DOI: 10.1038/nature07421
  • Primary Citation of Related Structures:  
    2ZJS, 2ZQP

  • PubMed Abstract: 
  • Over 30% of proteins are secreted across or integrated into membranes. Their newly synthesized forms contain either cleavable signal sequences or non-cleavable membrane anchor sequences, which direct them to the evolutionarily conserved Sec transloco ...

    Over 30% of proteins are secreted across or integrated into membranes. Their newly synthesized forms contain either cleavable signal sequences or non-cleavable membrane anchor sequences, which direct them to the evolutionarily conserved Sec translocon (SecYEG in prokaryotes and Sec61, comprising alpha-, gamma- and beta-subunits, in eukaryotes). The translocon then functions as a protein-conducting channel. These processes of protein localization occur either at or after translation. In bacteria, the SecA ATPase drives post-translational translocation. The only high-resolution structure of a translocon available so far is that for SecYEbeta from the archaeon Methanococcus jannaschii, which lacks SecA. Here we present the 3.2-A-resolution crystal structure of the SecYE translocon from a SecA-containing organism, Thermus thermophilus. The structure, solved as a complex with an anti-SecY Fab fragment, revealed a 'pre-open' state of SecYE, in which several transmembrane helices are shifted, as compared to the previous SecYEbeta structure, to create a hydrophobic crack open to the cytoplasm. Fab and SecA bind to a common site at the tip of the cytoplasmic domain of SecY. Molecular dynamics and disulphide mapping analyses suggest that the pre-open state might represent a SecYE conformational transition that is inducible by SecA binding. Moreover, we identified a SecA-SecYE interface that comprises SecA residues originally buried inside the protein, indicating that both the channel and the motor components of the Sec machinery undergo cooperative conformational changes on formation of the functional complex.


    Organizational Affiliation

    Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa 226-8501, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Preprotein translocase SecY subunitY434Thermus thermophilusMutation(s): 2 
Find proteins for Q5SHQ8 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Explore Q5SHQ8 
Go to UniProtKB:  Q5SHQ8
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Preprotein translocase SecE subunitE60Thermus thermophilusMutation(s): 0 
Find proteins for P38383 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Explore P38383 
Go to UniProtKB:  P38383
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.00 Å
  • R-Value Free: 0.445 
  • R-Value Work: 0.407 
  • R-Value Observed: 0.409 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.876α = 90
b = 91.876β = 90
c = 240.56γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance