1WIT

TWITCHIN IMMUNOGLOBULIN SUPERFAMILY DOMAIN (IGSF MODULE) (IG 18'), NMR, MINIMIZED AVERAGE STRUCTURE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 
  • Selection Criteria: MINIMIZED AVERAGE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and stability of an immunoglobulin superfamily domain from twitchin, a muscle protein of the nematode Caenorhabditis elegans.

Fong, S.Hamill, S.J.Proctor, M.Freund, S.M.Benian, G.M.Chothia, C.Bycroft, M.Clarke, J.

(1996) J Mol Biol 264: 624-639

  • DOI: 10.1006/jmbi.1996.0665
  • Primary Citation of Related Structures:  
    1WIU, 1WIT

  • PubMed Abstract: 
  • The NMR solution structure of an immunoglobulin superfamily module of twitchin (Ig 18') has been determined and the kinetic and equilibrium folding behaviour characterised. Thirty molecular coordinates were calculated using a hybrid distance geometry-simulated annealing protocol based on 1207 distance and 48 dihedral restraints ...

    The NMR solution structure of an immunoglobulin superfamily module of twitchin (Ig 18') has been determined and the kinetic and equilibrium folding behaviour characterised. Thirty molecular coordinates were calculated using a hybrid distance geometry-simulated annealing protocol based on 1207 distance and 48 dihedral restraints. The atomic rms distributions about the mean coordinate for the ensemble of structures is 0.55( +/- 0.09) A for backbone atoms and 1.10( +/- 0.08) A for all heavy atoms. The protein has a topology very similar to that of telokin and the titin Ig domains and thus it falls into the I set of the immunoglobulin superfamily. The close agreement between the predicted and observed structures of Ig 18' demonstrates clearly that the I set profile can be applied in the structure prediction of immunoglobulin-like domains of diverse modular proteins. Folding studies reveal that the protein has relatively low thermodynamic stability, deltaG(H2O)U-F = 4.0 kcal mol(-1) at physiological pH. Unfolding studies suggest that the protein has considerable kinetic stability, the half life of the unfolding is greater than 40 minutes in the absence of denaturant.


    Related Citations: 
    • Additional Sequence Complexity in the Muscle Gene, Unc-22, and its Encoded Protein, Twitchin, of Caenorhabditis Elegans
      Benian, G.M., L'Hernault, S.W., Morris, M.E.
      (1993) Genetics 134: 1097
    • Sequence of an Unusually Large Protein Implicated in Regulation of Myosin Activity in C. Elegans
      Benian, G.M., Kiff, J.E., Neckelmann, N., Moerman, D.G., Waterston, R.H.
      (1989) Nature 342: 45

    Organizational Affiliation

    Centre for Protein Engineering, MRC Unit of Protein Folding and Design, Cambridge, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TWITCHIN 18TH IGSF MODULEA93Caenorhabditis elegansMutation(s): 0 
Gene Names: unc-22ZK617.1
EC: 2.7.11.1
UniProt
Find proteins for Q23551 (Caenorhabditis elegans)
Explore Q23551 
Go to UniProtKB:  Q23551
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 
  • Selection Criteria: MINIMIZED AVERAGE 
  • OLDERADO: 1WIT Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 1996-06-23 
  • Released Date: 1996-12-23 
  • Deposition Author(s): Fong, S., Bycroft, M.

Revision History  (Full details and data files)

  • Version 1.0: 1996-12-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance