3TGO

Crystal structure of the E. coli BamCD complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of the beta-barrel assembly machinery BamCD protein complex

Kim, K.H.Aulakh, S.Paetzel, M.

(2011) J Biol Chem 286: 39116-39121

  • DOI: 10.1074/jbc.M111.298166
  • Primary Citation of Related Structures:  
    3TGO

  • PubMed Abstract: 
  • The β-barrel assembly machinery (BAM) complex of Escherichia coli is a multiprotein machine that catalyzes the essential process of assembling outer membrane proteins. The BAM complex consists of five proteins: one membrane protein, BamA, and four lipoproteins, BamB, BamC, BamD, and BamE ...

    The β-barrel assembly machinery (BAM) complex of Escherichia coli is a multiprotein machine that catalyzes the essential process of assembling outer membrane proteins. The BAM complex consists of five proteins: one membrane protein, BamA, and four lipoproteins, BamB, BamC, BamD, and BamE. Here, we report the first crystal structure of a Bam lipoprotein complex: the essential lipoprotein BamD in complex with the N-terminal half of BamC (BamC(UN) (Asp(28)-Ala(217)), a 73-residue-long unstructured region followed by the N-terminal domain). The BamCD complex is stabilized predominantly by various hydrogen bonds and salt bridges formed between BamD and the N-terminal unstructured region of BamC. Sequence and molecular surface analyses revealed that many of the conserved residues in both proteins are found at the BamC-BamD interface. A series of truncation mutagenesis and analytical gel filtration chromatography experiments confirmed that the unstructured region of BamC is essential for stabilizing the BamCD complex structure. The unstructured N terminus of BamC interacts with the proposed substrate-binding pocket of BamD, suggesting that this region of BamC may play a regulatory role in outer membrane protein biogenesis.


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UPF0169 lipoprotein yfiOA, B229Escherichia coli K-12Mutation(s): 0 
Gene Names: b2595JW2577yfiObamD
Membrane Entity: Yes 
UniProt
Find proteins for P0AC02 (Escherichia coli (strain K12))
Explore P0AC02 
Go to UniProtKB:  P0AC02
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AC02
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Lipoprotein 34C, D323Escherichia coli K-12Mutation(s): 0 
Gene Names: b2477dapXJW2462nlpBbamC
Membrane Entity: Yes 
UniProt
Find proteins for P0A903 (Escherichia coli (strain K12))
Explore P0A903 
Go to UniProtKB:  P0A903
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A903
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.181 
  • Space Group: I 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.78α = 90
b = 133.38β = 100.15
c = 144.992γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-28
    Type: Initial release
  • Version 1.1: 2011-11-16
    Changes: Database references