2B9C

Structure of tropomyosin's mid-region: bending and binding sites for actin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.256 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the mid-region of tropomyosin: Bending and binding sites for actin.

Brown, J.H.Zhou, Z.Reshetnikova, L.Robinson, H.Yammani, R.D.Tobacman, L.S.Cohen, C.

(2005) Proc.Natl.Acad.Sci.Usa 102: 18878-18883

  • DOI: 10.1073/pnas.0509269102

  • PubMed Abstract: 
  • Tropomyosin is a two-chain alpha-helical coiled coil whose periodic interactions with the F-actin helix are critical for thin filament stabilization and the regulation of muscle contraction. Here we deduce the mechanical and chemical basis of these i ...

    Tropomyosin is a two-chain alpha-helical coiled coil whose periodic interactions with the F-actin helix are critical for thin filament stabilization and the regulation of muscle contraction. Here we deduce the mechanical and chemical basis of these interactions from the 2.3-A-resolution crystal structure of the middle three of tropomyosin's seven periods. Geometrically specific bends of the coiled coil, produced by clusters of core alanines, and variable bends about gaps in the core, produced by isolated alanines, occur along the molecule. The crystal packing is notable in signifying that the functionally important fifth period includes an especially favorable protein-binding site, comprising an unusual apolar patch on the surface together with surrounding charged residues. Based on these and other results, we have constructed a specific model of the thin filament, with the N-terminal halves of each period (i.e., the so-called "alpha zones") of tropomyosin axially aligned with subdomain 3 of each monomer in F-actin.


    Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454-9110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
striated-muscle alpha tropomyosin
A, B
147Rattus norvegicusMutation(s): 0 
Gene Names: Tpm1 (Alpha-tm, Tpma)
Find proteins for P04692 (Rattus norvegicus)
Go to UniProtKB:  P04692
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.256 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 80.515α = 90.00
b = 80.515β = 90.00
c = 112.453γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
RESOLVEphasing
SOLVEphasing
PDB_EXTRACTdata extraction
DENZOdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-03
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description