4C4V

Structure of the outer membrane protein insertase BamA with one POTRA domain.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of Bama, an Essential Factor in Outer Membrane Protein Biogenesis

Albrecht, R.Schuetz, M.Oberhettinger, P.Faulstich, M.Bermejo, I.Rudel, T.Diederichs, K.Zeth, K.

(2014) Acta Crystallogr.,Sect.D 70: 1779

  • DOI: 10.1107/S1399004714007482

  • PubMed Abstract: 
  • Outer membrane protein (OMP) biogenesis is an essential process for maintaining the bacterial cell envelope and involves the β-barrel assembly machinery (BAM) for OMP recognition, folding and assembly. In Escherichia coli this function is orchestrate ...

    Outer membrane protein (OMP) biogenesis is an essential process for maintaining the bacterial cell envelope and involves the β-barrel assembly machinery (BAM) for OMP recognition, folding and assembly. In Escherichia coli this function is orchestrated by five proteins: the integral outer membrane protein BamA of the Omp85 superfamily and four associated lipoproteins. To unravel the mechanism underlying OMP folding and insertion, the structure of the E. coli BamA β-barrel and P5 domain was determined at 3 Å resolution. These data add information beyond that provided in the recently published crystal structures of BamA from Haemophilus ducreyi and Neisseria gonorrhoeae and are a valuable basis for the interpretation of pertinent functional studies. In an `open' conformation, E. coli BamA displays a significant degree of flexibility between P5 and the barrel domain, which is indicative of a multi-state function in substrate transfer. E. coli BamA is characterized by a discontinuous β-barrel with impaired β1-β16 strand interactions denoted by only two connecting hydrogen bonds and a disordered C-terminus. The 16-stranded barrel surrounds a large cavity which implies a function in OMP substrate binding and partial folding. These findings strongly support a mechanism of OMP biogenesis in which substrates are partially folded inside the barrel cavity and are subsequently released laterally into the lipid bilayer.


    Organizational Affiliation

    Department of Protein Evolution, Max-Planck-Institut für Entwicklungsbiologie, Spemannstrasse 35, 72076 Tübingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OUTER MEMBRANE PROTEIN ASSEMBLY FACTOR BAMA
A
464Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamA (yaeT, yzzN, yzzY)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Omp85-TpsB Outer Membrane Transporter Superfamily
Protein: 
BamA with POTRA domain 5
Find proteins for P0A940 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A940
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
OUTER MEMBRANE PROTEIN ASSEMBLY FACTOR BAMA
B
467Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamA (yaeT, yzzN, yzzY)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Omp85-TpsB Outer Membrane Transporter Superfamily
Protein: 
BamA with POTRA domain 5
Find proteins for P0A940 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A940
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.234 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 79.583α = 90.00
b = 67.347β = 93.46
c = 109.795γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata scaling
XDSdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-23
    Type: Initial release
  • Version 1.1: 2014-06-18
    Type: Database references, Source and taxonomy