2QBW

The crystal structure of PDZ-Fibronectin fusion protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Design of protein function leaps by directed domain interface evolution.

Huang, J.Koide, A.Makabe, K.Koide, S.

(2008) Proc.Natl.Acad.Sci.Usa 105: 6578-6583

  • DOI: 10.1073/pnas.0801097105

  • PubMed Abstract: 
  • Most natural proteins performing sophisticated tasks contain multiple domains where an active site is located at the domain interface. Comparative structural analyses suggest that major leaps in protein function occur through gene recombination event ...

    Most natural proteins performing sophisticated tasks contain multiple domains where an active site is located at the domain interface. Comparative structural analyses suggest that major leaps in protein function occur through gene recombination events that connect two or more protein domains to generate a new active site, frequently occurring at the newly created domain interface. However, such functional leaps by combination of unrelated domains have not been directly demonstrated. Here we show that highly specific and complex protein functions can be generated by joining a low-affinity peptide-binding domain with a functionally inert second domain and subsequently optimizing the domain interface. These directed evolution processes dramatically enhanced both affinity and specificity to a level unattainable with a single domain, corresponding to >500-fold and >2,000-fold increases of affinity and specificity, respectively. An x-ray crystal structure revealed that the resulting "affinity clamp" had clamshell architecture as designed, with large additional binding surface contributed by the second domain. The affinity clamps having a single-nanomolar dissociation constant outperformed a monoclonal antibody in immunochemical applications. This work establishes evolutionary paths from isolated domains with primitive function to multidomain proteins with sophisticated function and introduces a new protein-engineering concept that allows for the generation of highly functional affinity reagents to a predefined target. The prevalence and variety of natural interaction domains suggest that numerous new functions can be designed by using directed domain interface evolution.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PDZ-Fibronectin fusion protein
A
195Homo sapiensMutation(s): 0 
Gene Names: ERBIN (ERBB2IP, KIAA1225, LAP2)
Find proteins for Q96RT1 (Homo sapiens)
Go to Gene View: ERBIN
Go to UniProtKB:  Q96RT1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Polypeptide
B
8N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.168 
  • Space Group: I 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.818α = 90.00
b = 79.350β = 90.00
c = 119.842γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
MOLREPphasing
HKL-2000data reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance