1OZB

Crystal Structure of SecB complexed with SecA C-terminus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural determinants of SecB recognition by SecA in bacterial protein translocation

Zhou, J.Xu, Z.

(2003) Nat.Struct.Mol.Biol. 10: 942-947

  • DOI: 10.1038/nsb980

  • PubMed Abstract: 
  • SecB is a bacterial chaperone involved in directing pre-protein to the translocation pathway by its specific interaction with the peripheral membrane ATPase SecA. The SecB-binding site on SecA is located at its C terminus and consists of a stretch of ...

    SecB is a bacterial chaperone involved in directing pre-protein to the translocation pathway by its specific interaction with the peripheral membrane ATPase SecA. The SecB-binding site on SecA is located at its C terminus and consists of a stretch of highly conserved residues. The crystal structure of SecB in complex with the C-terminal 27 amino acids of SecA from Haemophilus influenzae shows that the SecA peptide is structured as a CCCH zinc-binding motif. One SecB tetramer is bound by two SecA peptides, and the interface involves primarily salt bridges and hydrogen bonding interactions. The structure explains the importance of the zinc-binding motif and conserved residues at the C terminus of SecA in its high-affinity binding with SecB. It also suggests a model of SecB-SecA interaction and its implication for the mechanism of pre-protein transfer in bacterial protein translocation.


    Organizational Affiliation

    Department of Biological Chemistry and Life Sciences Institute, University of Michigan Medical School, Ann Arbor 48109-0606, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein-export protein secB
A, B, C, D, E, F, G, H
169Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)Gene Names: secB
Find proteins for P44853 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Go to UniProtKB:  P44853
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Preprotein translocase secA subunit
I, J
27Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)Gene Names: secA
Find proteins for P43803 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Go to UniProtKB:  P43803
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
I, J
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.226 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 114.500α = 90.00
b = 114.500β = 90.00
c = 286.100γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2003-04-08 
  • Released Date: 2003-10-14 
  • Deposition Author(s): Zhou, J., Xu, Z.

Revision History 

  • Version 1.0: 2003-10-14
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance