3OG5

Crystal Structure of BamA POTRA45 tandem


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and Flexibility of the Complete Periplasmic Domain of BamA: The Protein Insertion Machine of the Outer Membrane

Gatzeva-Topalova, P.Z.Warner, L.R.Pardi, A.Sousa, M.C.

(2010) Structure 18: 1492-1501

  • DOI: 10.1016/j.str.2010.08.012

  • PubMed Abstract: 
  • Folding and insertion of β-barrel outer membrane proteins (OMPs) is essential for Gram-negative bacteria. This process is mediated by the multiprotein complex BAM, composed of the essential β-barrel OMP BamA and four lipoproteins (BamBCDE). The perip ...

    Folding and insertion of β-barrel outer membrane proteins (OMPs) is essential for Gram-negative bacteria. This process is mediated by the multiprotein complex BAM, composed of the essential β-barrel OMP BamA and four lipoproteins (BamBCDE). The periplasmic domain of BamA is key for its function and contains five "polypeptide transport-associated" (POTRA) repeats. Here, we report the crystal structure of the POTRA4-5 tandem, containing the essential for BAM complex formation and cell viability POTRA5. The domain orientation observed in the crystal is validated by solution NMR and SAXS. Using previously determined structures of BamA POTRA1-4, we present a spliced model of the entire BamA periplasmic domain validated by SAXS. Solution scattering shows that conformational flexibility between POTRA2 and 3 gives rise to compact and extended conformations. The length of BamA in its extended conformation suggests that the protein may bridge the inner and outer membranes across the periplasmic space.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO 80309, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly complex, YaeT protein
A, B
166Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamA (yaeT, yzzN, yzzY)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Omp85-TpsB Outer Membrane Transporter Superfamily
Protein: 
BamA21-351 POTRA domains (periplasmic fragment, P212121)
Find proteins for P0A940 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A940
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.211 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 118.492α = 90.00
b = 118.492β = 90.00
c = 69.992γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHENIXphasing
HKL-2000data reduction
MOLREPphasing
SCALEPACKdata scaling
HKL-2000data collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance