2BH8

Combinatorial Protein 1b11


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Segment of Cold Shock Protein Directs the Folding of a Combinatorial Protein

De Bono, S.Riechmann, L.Girard, E.Williams, R.L.Winter, G.

(2005) Proc.Natl.Acad.Sci.USA 102: 1396

  • DOI: 10.1073/pnas.0407298102

  • PubMed Abstract: 
  • It has been suggested that protein domains evolved by the non-homologous recombination of building blocks of subdomain size. In earlier work we attempted to recapitulate domain evolution in vitro. We took a polypeptide segment comprising three beta-s ...

    It has been suggested that protein domains evolved by the non-homologous recombination of building blocks of subdomain size. In earlier work we attempted to recapitulate domain evolution in vitro. We took a polypeptide segment comprising three beta-strands in the monomeric, five-stranded beta-barrel cold shock protein (CspA) of Escherichia coli as a building block. This segment corresponds to a complete exon in homologous eukaryotic proteins and includes residues that nucleate folding in CspA. We recombined this segment at random with fragments of natural proteins and succeeded in generating a range of folded chimaeric proteins. We now present the crystal structure of one such combinatorial protein, 1b11, a 103-residue polypeptide that includes segments from CspA and the S1 domain of the 30S ribosomal subunit of E. coli. The structure reveals a segment-swapped, six-stranded beta-barrel of unique architecture that assembles to a tetramer. Surprisingly, the CspA segment retains its structural identity in 1b11, recapitulating its original fold and deforming the structure of the S1 segment as necessary to complete a barrel. Our work provides structural evidence that (i) random shuffling of nonhomologous polypeptide segments can lead to folded proteins and unique architectures, (ii) many structural features of the segments are retained, and (iii) some segments can act as templates around which the rest of the protein folds.


    Organizational Affiliation

    Centre for Protein Engineering and Laboratory of Molecular Biology, Medical Research Council Centre, Hills Road, Cambridge CB2 2QH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
1B11
A, B
101Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cspA (cspS)
Find proteins for P0A9X9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A9X9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.192 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 101.090α = 90.00
b = 101.090β = 90.00
c = 76.116γ = 90.00
Software Package:
Software NamePurpose
CCP4phasing
SCALAdata scaling
SHARPphasing
SnBphasing
MOSFLMdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-02-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2018-01-24
    Type: Source and taxonomy