1CQ4

CI2 MUTANT WITH TETRAGLUTAMINE (MGQQQQGM) REPLACING MET59


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a dimeric chymotrypsin inhibitor 2 mutant containing an inserted glutamine repeat.

Chen, Y.W.Stott, K.Perutz, M.F.

(1999) Proc.Natl.Acad.Sci.USA 96: 1257-1261


  • PubMed Abstract: 
  • We have constructed mutants of chymotrypsin inhibitor 2 with short glutamine repeats inserted into its inhibitory loop. These mutants oligomerize when expressed in Escherichia coli. The dimer of a mutant with four glutamines now has been crystallized ...

    We have constructed mutants of chymotrypsin inhibitor 2 with short glutamine repeats inserted into its inhibitory loop. These mutants oligomerize when expressed in Escherichia coli. The dimer of a mutant with four glutamines now has been crystallized, and its structure has been solved by molecular replacement by using the wild-type monomer as a search model. The structure of each half of the dimer is found to be the same as that of the wild-type monomer, except around the glutamine insertion. It was proposed that the components of the oligomers are held together by hydrogen bonds between the main-chain and side-chain amides of the glutamine repeats. Instead, they appear to form by swapping domains on folding in E. coli, and the glutamine repeats connecting the components of the dimers are disordered.


    Related Citations: 
    • Glutamine, Alanine or Glycine Repeats Inserted Into the Loop of a Protein Have Minimal Effects on Stability and Folding Rates
      Ladurner, A.G.,Fersht, A.R.
      (1997) J.Mol.Biol. 273: 330
    • The Determination of the Three-Dimensional Structure of Barley Serine Proteinase Inhibitor 2 by Nuclear Magnetic Resonance, Distance Geometry and Restrained Molecular Dynamics
      Clore, G.M.,Gronenborn, A.M.,Kjaer, M.,Poulsen, F.M.
      (1987) Protein Eng. 1: 305
    • Incorporation of Glutamine Repeats Makes Protein Oligomerize: Implications for Neurodegenerative Diseases
      Stott, K.,Blackburn, J.M.,Butler, P.J.G.,Perutz, M.
      (1995) Proc.Natl.Acad.Sci.USA 92: 6509
    • Crystal and Molecular Structure of the Serine Proteinase Inhibitor Ci-2 from Barley Seeds
      Mcphalen, C.A.,James, M.N.G.
      (1987) Biochemistry 26: 261
    • Towards the Complete Structural Characterization of a Protein Folding Pathway: The Structures of the Denatured, Transition and Native States for the Association/Folding of Two Complementary Fragments of Cleaved Chymotrypsin Inhibitor 2. Direction Evidence for a Nucleation-Condensation Mechanism
      Neira, J.L.,Davis, B.,Ladurner, A.G.,Buckle, A.M.,De Prat Gay, G.,Fersht, A.R.
      (1996) Fold.Des. 1: 189


    Organizational Affiliation

    Centre for Protein Engineering, Medical Research Council Centre, Hills Road, Cambridge CB2 2QH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (SERINE PROTEINASE INHIBITOR 2)
A
47Hordeum vulgareN/A
Find proteins for P01053 (Hordeum vulgare)
Go to UniProtKB:  P01053
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (SERINE PROTEINASE INHIBITOR 2)
B
24Hordeum vulgareN/A
Find proteins for P01053 (Hordeum vulgare)
Go to UniProtKB:  P01053
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.240 
  • Space Group: P 6 2 2
Unit Cell:
Length (Å)Angle (°)
a = 68.267α = 90.00
b = 68.267β = 90.00
c = 60.833γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance