3AA9

Crystal Structure Analysis of the Mutant CutA1 (E61V) from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Remarkable improvement in the heat stability of CutA1 from Escherichia coli by rational protein design

Matsuura, Y.Ota, M.Tanaka, T.Takehira, M.Ogasahara, K.Bagautdinov, B.Kunishima, N.Yutani, K.

(2010) J.Biochem. 148: 449-458

  • DOI: 10.1093/jb/mvq079
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • To enhance the heat stability of the CutA1 protein from Escherichia coli (EcCutA1) so that it has comparable stability to CutA1 from Pyrococcus horikoshii with a denaturation temperature (T(d)) of 150°C, we used the Stability Profile of Mutant Protei ...

    To enhance the heat stability of the CutA1 protein from Escherichia coli (EcCutA1) so that it has comparable stability to CutA1 from Pyrococcus horikoshii with a denaturation temperature (T(d)) of 150°C, we used the Stability Profile of Mutant Protein (SPMP) to examine the structure-sequence (3D-1D) compatibility between the conformation of EcCutA1 and its native sequence [J. Mol. Biol., 248, 733-738, (1995)]. We identified seven residues in EcCutA1 that were incompatible in terms of dihedral angles and hydrophobicity. These residues were replaced with appropriate amino acids, and the mutant proteins were evaluated for changes in stability by DSC and denaturant denaturation. The mutations that were introduced at five out of the seven positions improved the stability of EcCutA1. The T(d) values of single (S11A) and triple (S11V/E61V/Q73V) mutants improved by 16.5 and 26.6°C, respectively, compared to that of the wild-type protein (89.9°C). These analyses showed that (1) the stability of EcCutA1 is remarkably improved by slight substitutions, even though the stability of the wild-type protein is considerably high, (2) remarkable improvements in the stability can be quantitatively explained based on the newly solved native structure, and (3) SPMP is a powerful tool to examine substitutions that improve protein stability.


    Organizational Affiliation

    RIKEN SPring-8 Center, Harima Institute, RIKEN; 1-1-1 Kouto, Sayo, Hyogo, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Divalent-cation tolerance protein cutA
A, B, C
112Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: cutA (cutA1, cycY)
Find proteins for P69488 (Escherichia coli (strain K12))
Go to UniProtKB:  P69488
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 38.187α = 90.00
b = 50.101β = 90.00
c = 147.424γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data collection
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance