1FHG

HIGH RESOLUTION REFINEMENT OF TELOKIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

  • Primary Citation of Related Structures:  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 ...

    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
    • 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TELOKIN
A
154Meleagris gallopavoN/A
Find proteins for P56276 (Meleagris gallopavo)
Go to UniProtKB:  P56276
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.210 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 63.710α = 90.00
b = 63.710β = 90.00
c = 58.860γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance