1FHG

HIGH RESOLUTION REFINEMENT OF TELOKIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.233 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

X-ray structure determination of telokin, the C-terminal domain of myosin light chain kinase, at 2.8 A resolution.

Holden, H.M.Ito, M.Hartshorne, D.J.Rayment, I.

(1992) J Mol Biol 227: 840-851

  • DOI: 10.1016/0022-2836(92)90226-a
  • Primary Citation of Related Structures:  
    1FHG, 1TLK

  • PubMed Abstract: 
  • The three-dimensional structure of telokin, an acidic protein identical to the C-terminal portion of smooth muscle myosin light chain kinase from turkey gizzard, has been determined at 2.8 A resolution and refined to a crystallographic R-factor of 19.5% for all measured X-ray data from 30 A to 2 ...

    The three-dimensional structure of telokin, an acidic protein identical to the C-terminal portion of smooth muscle myosin light chain kinase from turkey gizzard, has been determined at 2.8 A resolution and refined to a crystallographic R-factor of 19.5% for all measured X-ray data from 30 A to 2.8 A. Crystals used in the investigation belonged to the space group P3(2)21, with one molecule per asymmetric unit and unit cell dimensions of a = b = 64.4 A and c = 50.6 A. Telokin contains 154 amino acid residues, 103 of which were visible in the electron density map. The overall molecular fold of telokin consists of seven strands of antiparallel beta-pleated sheet that wrap around to form a barrel. There is also an extended tail of eight amino acid residues at the N terminus that does not participate in beta-sheet formation. The beta-barrel can be simply envisioned as two layers of beta-sheet, nearly parallel to one another, with one layer containing four and the other three beta-strands. This type of beta-barrel, as seen in telokin, was first observed for the CH2 domain of an immunoglobulin fragment Fc. Telokin is an intracellular protein and, as such, does not contain the disulphide linkage between beta-strands B and F normally observed in the immunoglobulin constant domains. It does, however, contain two cysteine amino acid residues (Cys63 and Cys115) that are situated at structurally identical positions to those forming the disulphide linkage in the immunoglobulin constant domain.


    Related Citations: 
    • X-Ray Structure Determination of Telokin, the C-terminal Domain of Myosin Light Chain Kinase, at 2.8 Angstroms Resolution
      Holden, H.M., Ito, M., Hartshorne, D.J., Rayment, I.
      (1992) J Mol Biol 227: 840
    • Regulation of the Cross-bridge Cycle: the Effects of MgADP, LC17 Isoforms and Telokin.
      Somlyo, A.V., Matthew, J.D., Wu, X., Khromov, A.S., Somlyo, A.P.
      (1998) Acta Physiol Scand 164: 381
    • Acceleration of Myosin Light Chain Dephosphorylation and Relaxation of Smooth Muscle by Telokin. Synergism with Cyclic Nucleotide-activated Kinase.
      Wu, X., Haystead, T.A., Nakamoto, R.K., Somlyo, A.V., Somlyo, A.P.
      (1998) J Biol Chem 273: 11362

    Organizational Affiliation

    Institute for Enzyme Research, Graduate School, University of Wisconsin, Madison 53705.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TELOKINA154Meleagris gallopavoMutation(s): 0 
UniProt
Find proteins for P56276 (Meleagris gallopavo)
Explore P56276 
Go to UniProtKB:  P56276
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56276
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.233 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.71α = 90
b = 63.71β = 90
c = 58.86γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-04-13
    Changes: Database references, Structure summary