2V1V

3D STRUCTURE OF THE M8L MUTANT OF SQUASH TRYPSIN INHIBITOR CMTI-I


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Conservative Mutation met8Leu Affects the Folding Process and Structural Stability of Squash Trypsin Inhibitor Cmti-I

Zhukov, I.Jaroszewski, L.Bierzynski, A.

(2000) Protein Sci. 9: 273

  • DOI: 10.1110/ps.9.2.273
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Protein molecules can accommodate a large number of mutations without noticeable effects on their stability and folding kinetics. On the other hand, some mutations can have quite strong effects on protein conformational properties. Such mutations eit ...

    Protein molecules can accommodate a large number of mutations without noticeable effects on their stability and folding kinetics. On the other hand, some mutations can have quite strong effects on protein conformational properties. Such mutations either destabilize secondary structures, e.g., alpha-helices, are incompatible with close packing of protein hydrophobic cores, or lead to disruption of some specific interactions such as disulfide cross links, salt bridges, hydrogen bonds, or aromatic-aromatic contacts. The Met8 --> Leu mutation in CMTI-I results in significant destabilization of the protein structure. This effect could hardly be expected since the mutation is highly conservative, and the side chain of residue 8 is situated on the protein surface. We show that the protein destabilization is caused by rearrangement of a hydrophobic cluster formed by side chains of residues 8, Ile6, and Leu17 that leads to partial breaking of a hydrogen bond formed by the amide group of Leu17 with water and to a reduction of a hydrophobic surface buried within the cluster. The mutation perturbs also the protein folding. In aerobic conditions the reduced wild-type protein folds effectively into its native structure, whereas more then 75% of the mutant molecules are trapped in various misfolded species. The main conclusion of this work is that conservative mutations of hydrophobic residues can destabilize a protein structure even if these residues are situated on the protein surface and partially accessible to water. Structural rearrangement of small hydrophobic clusters formed by such residues can lead to local changes in protein hydration, and consequently, can affect considerably protein stability and folding process.


    Related Citations: 
    • The Analysis of Molecular Dynamics for M8L Cmti-I Protein
      Sledz, P.,Zhukov, I.,Ejchart, A.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, ul. Pawinskiego.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN INHIBITOR 1
A
29Cucurbita maximaMutations: M8L
Find proteins for P01074 (Cucurbita maxima)
Go to UniProtKB:  P01074
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 
  • Olderado: 2V1V Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance