2X9A

crystal structure of g3p from phage IF1 in complex with its coreceptor, the C-terminal domain of TolA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Filamentous Phages Fd and If1 Use Different Mechanisms to Infect Escherichia Coli.

Lorenz, S.H.Jakob, R.P.Weininger, U.Balbach, J.Dobbek, H.Schmid, F.X.

(2011) J.Mol.Biol. 405: 989

  • DOI: 10.1016/j.jmb.2010.11.030
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The filamentous phage fd uses its gene 3 protein (G3P) to target Escherichia coli cells in a two-step process. First, the N2 domain of G3P attaches to an F pilus, and then the N1 domain binds to TolA-C. N1 and N2 are tightly associated, rendering the ...

    The filamentous phage fd uses its gene 3 protein (G3P) to target Escherichia coli cells in a two-step process. First, the N2 domain of G3P attaches to an F pilus, and then the N1 domain binds to TolA-C. N1 and N2 are tightly associated, rendering the phage robust but noninfectious because the binding site for TolA-C is buried at the domain interface. Binding of N2 to the F pilus initiates partial unfolding, domain disassembly, and prolyl cis-to-trans isomerization in the hinge between N1 and N2. This activates the phage, and trans-Pro213 maintains this state long enough for N1 to reach TolA-C. Phage IF1 targets I pili, and its G3P contains also an N1 domain and an N2 domain. The pilus-binding N2 domains of the phages IF1 and fd are unrelated, and the N1 domains share a 31% sequence identity. We show that N2 of phage IF1 mediates binding to the I pilus, and that N1 targets TolA. Crystallographic and NMR analyses of the complex between N1 and TolA-C indicate that phage IF1 interacts with the same site on TolA-C as phage fd. In IF1-G3P, N1 and N2 are independently folding units, however, and the TolA binding site on N1 is permanently accessible. Activation by unfolding and prolyl isomerization, as in the case of phage fd, is not observed. In IF1-G3P, the absence of stabilizing domain interactions is compensated for by a strong increase in the stabilities of the individual domains. Apparently, these closely related filamentous phages evolved different mechanisms to reconcile robustness with high infectivity.


    Organizational Affiliation

    Laboratorium für Biochemie, Universität Bayreuth, D-95440 Bayreuth, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATTACHMENT PROTEIN G3P
A, C
65Enterobacteria phage If1Mutation(s): 0 
Gene Names: III
Find proteins for O80297 (Enterobacteria phage If1)
Go to UniProtKB:  O80297
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MEMBRANE SPANNING PROTEIN, REQUIRED FOR OUTER MEMBRANE INTEGRITY
B, D
136Escherichia coli O157:H7Mutation(s): 0 
Gene Names: tolA
Find proteins for Q8X965 (Escherichia coli O157:H7)
Go to UniProtKB:  Q8X965
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.181 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 94.515α = 90.00
b = 94.515β = 90.00
c = 132.111γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-04-04
    Type: Data collection