3AH6

Remarkable improvement of the heat stability of CutA1 from E.coli by rational protein designing


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

Starting Model: experimental
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This is version 1.2 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: https://doi.org/10.1093/jb/mvq079
  • Primary Citation of Related Structures:  
    3AA8, 3AA9, 3AH6

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Divalent-cation tolerance protein cutA
A, B, C, D, E
A, B, C, D, E, F
112Escherichia coli K-12Mutation(s): 1 
Gene Names: cutA1
UniProt
Find proteins for P69488 (Escherichia coli (strain K12))
Explore P69488 
Go to UniProtKB:  P69488
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69488
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.239α = 90
b = 96.872β = 90
c = 106.352γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description