2YSU

Structure of the complex between BtuB and Colicin E2 receptor binding domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.250 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the complex of the colicin E2 R-domain and its BtuB receptor. The outer membrane colicin translocon

Sharma, O.Yamashita, E.Zhalnina, M.V.Zakharov, S.D.Datsenko, K.A.Wanner, B.L.Cramer, W.A.

(2007) J.Biol.Chem. 282: 23163-23170

  • DOI: 10.1074/jbc.M703004200

  • PubMed Abstract: 
  • The crystal structure of the complex of the BtuB receptor and the 135-residue coiled-coil receptor-binding R-domain of colicin E3 (E3R135) suggested a novel mechanism for import of colicin proteins across the outer membrane. It was proposed that one ...

    The crystal structure of the complex of the BtuB receptor and the 135-residue coiled-coil receptor-binding R-domain of colicin E3 (E3R135) suggested a novel mechanism for import of colicin proteins across the outer membrane. It was proposed that one function of the R-domain, which extends along the outer membrane surface, is to recruit an additional outer membrane protein(s) to form a translocon for passage colicin activity domain. A 3.5-A crystal structure of the complex of E2R135 and BtuB (E2R135-BtuB) was obtained, which revealed E2R135 bound to BtuB in an oblique orientation identical to that previously found for E3R135. The only significant difference between the two structures was that the bound coiled-coil R-domain of colicin E2, compared with that of colicin E3, was extended by two and five residues at the N and C termini, respectively. There was no detectable displacement of the BtuB plug domain in either structure, implying that colicin is not imported through the outer membrane by BtuB alone. It was concluded that the oblique orientation of the R-domain of the nuclease E colicins has a function in the recruitment of another member(s) of an outer membrane translocon. Screening of porin knock-out mutants showed that either OmpF or OmpC can function in such a translocon. Arg(452) at the R/C-domain interface in colicin E2 was found have an essential role at a putative site of protease cleavage, which would liberate the C-terminal activity domain for passage through the outer membrane translocon.


    Organizational Affiliation

    Department of Biological Sciences, Lilly Hall of Life Sciences, Purdue University, West Lafayette, Indiana 47907, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Vitamin B12 transporter btuB
A
594Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: btuB (bfe, cer, dcrC)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
apo BtuB cobalamin transporter
Find proteins for P06129 (Escherichia coli (strain K12))
Go to UniProtKB:  P06129
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Colicin-E2
B
135Escherichia coliMutation(s): 0 
Gene Names: col (ceaB)
EC: 3.1.-.-
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
apo BtuB cobalamin transporter
Find proteins for P04419 (Escherichia coli)
Go to UniProtKB:  P04419
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.250 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 76.231α = 90.00
b = 80.685β = 90.00
c = 235.916γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data reduction
REFMACphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance