2OMZ

Crystal structure of InlA Y369A/hEC1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.153 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Thermodynamically reengineering the listerial invasion complex InlA/E-cadherin.

Wollert, T.Heinz, D.W.Schubert, W.D.

(2007) Proc.Natl.Acad.Sci.Usa 104: 13960-13965

  • DOI: 10.1073/pnas.0702199104
  • Primary Citation of Related Structures:  2OMT, 2OMU, 2OMX

  • PubMed Abstract: 
  • Biological processes essentially all depend on the specific recognition between macromolecules and their interaction partners. Although many such interactions have been characterized both structurally and biophysically, the thermodynamic effects of s ...

    Biological processes essentially all depend on the specific recognition between macromolecules and their interaction partners. Although many such interactions have been characterized both structurally and biophysically, the thermodynamic effects of small atomic changes remain poorly understood. Based on the crystal structure of the bacterial invasion protein internalin (InlA) of Listeria monocytogenes in complex with its human receptor E-cadherin (hEC1), we analyzed the interface to identify single amino acid substitutions in InlA that would potentially improve the overall quality of interaction and hence increase the weak binding affinity of the complex. Dissociation constants of InlA-variant/hEC1 complexes, as well as enthalpy and entropy of binding, were quantified by isothermal titration calorimetry. All single substitutions indeed significantly increase binding affinity. Structural changes were verified crystallographically at < or =2.0-A resolution, allowing thermodynamic characteristics of single substitutions to be rationalized structurally and providing unique insights into atomic contributions to binding enthalpy and entropy. Structural and thermodynamic data of all combinations of individual substitutions result in a thermodynamic network, allowing the source of cooperativity between distant recognition sites to be identified. One such pair of single substitutions improves affinity 5,000-fold. We thus demonstrate that rational reengineering of protein complexes is possible by making use of physically distant hot spots of recognition.


    Organizational Affiliation

    Molecular Host-Pathogen Interactions, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, D-38124 Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Internalin-A
A
466Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e)Gene Names: inlA
Find proteins for P0DJM0 (Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e))
Go to UniProtKB:  P0DJM0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Epithelial-cadherin
B
105Homo sapiensGene Names: CDH1 (CDHE, UVO)
Find proteins for P12830 (Homo sapiens)
Go to Gene View: CDH1
Go to UniProtKB:  P12830
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.153 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 55.323α = 90.00
b = 84.741β = 90.00
c = 108.416γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
DENZOdata reduction
EPMRphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Source and taxonomy, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Advisory, Refinement description