6GOX

SecA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The C-terminal tail of the bacterial translocation ATPase SecA modulates its activity.

Jamshad, M.Knowles, T.J.White, S.A.Ward, D.G.Mohammed, F.Rahman, K.F.Wynne, M.Hughes, G.W.Kramer, G.Bukau, B.Huber, D.

(2019) Elife 8

  • DOI: 10.7554/eLife.48385
  • Primary Citation of Related Structures:  
    6GOX

  • PubMed Abstract: 
  • In bacteria, the translocation of proteins across the cytoplasmic membrane by the Sec machinery requires the ATPase SecA. SecA binds ribosomes and recognises nascent substrate proteins, but the molecular mechanism of nascent substrate recognition is unknown ...

    In bacteria, the translocation of proteins across the cytoplasmic membrane by the Sec machinery requires the ATPase SecA. SecA binds ribosomes and recognises nascent substrate proteins, but the molecular mechanism of nascent substrate recognition is unknown. We investigated the role of the C-terminal tail (CTT) of SecA in nascent polypeptide recognition. The CTT consists of a flexible linker (FLD) and a small metal-binding domain (MBD). Phylogenetic analysis and ribosome binding experiments indicated that the MBD interacts with 70S ribosomes. Disruption of the MBD only or the entire CTT had opposing effects on ribosome binding, substrate-protein binding, ATPase activity and in vivo function, suggesting that the CTT influences the conformation of SecA. Site-specific crosslinking indicated that F399 in SecA contacts ribosomal protein uL29, and binding to nascent chains disrupts this interaction. Structural studies provided insight into the CTT-mediated conformational changes in SecA. Our results suggest a mechanism for nascent substrate protein recognition.


    Organizational Affiliation

    Institute for Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein translocase subunit SecAA822Escherichia coli K-12Mutation(s): 0 
Gene Names: secAazipeaprlDb0098JW0096
UniProt
Find proteins for P10408 (Escherichia coli (strain K12))
Explore P10408 
Go to UniProtKB:  P10408
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.14α = 90
b = 106.83β = 102.81
c = 75.98γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2018-06-04 
  • Released Date: 2019-06-19 
  • Deposition Author(s): White, S.A., Huber, D.

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection
  • Version 1.2: 2020-07-01
    Changes: Database references