4XA4

Crystal Structure of the coiled-coil surrounding Skip 3 of MYH7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.219 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Skip residues modulate the structural properties of the myosin rod and guide thick filament assembly.

Taylor, K.C.Buvoli, M.Korkmaz, E.N.Buvoli, A.Zheng, Y.Heinze, N.T.Cui, Q.Leinwand, L.A.Rayment, I.

(2015) Proc Natl Acad Sci U S A 112: E3806-E3815

  • DOI: https://doi.org/10.1073/pnas.1505813112
  • Primary Citation of Related Structures:  
    4XA1, 4XA3, 4XA4, 4XA6

  • PubMed Abstract: 

    The rod of sarcomeric myosins directs thick filament assembly and is characterized by the insertion of four skip residues that introduce discontinuities in the coiled-coil heptad repeats. We report here that the regions surrounding the first three skip residues share high structural similarity despite their low sequence homology. Near each of these skip residues, the coiled-coil transitions to a nonclose-packed structure inducing local relaxation of the superhelical pitch. Moreover, molecular dynamics suggest that these distorted regions can assume different conformationally stable states. In contrast, the last skip residue region constitutes a true molecular hinge, providing C-terminal rod flexibility. Assembly of myosin with mutated skip residues in cardiomyocytes shows that the functional importance of each skip residue is associated with rod position and reveals the unique role of the molecular hinge in promoting myosin antiparallel packing. By defining the biophysical properties of the rod, the structures and molecular dynamic calculations presented here provide insight into thick filament formation, and highlight the structural differences occurring between the coiled-coils of myosin and the stereotypical tropomyosin. In addition to extending our knowledge into the conformational and biological properties of coiled-coil discontinuities, the molecular characterization of the four myosin skip residues also provides a guide to modeling the effects of rod mutations causing cardiac and skeletal myopathies.


  • Organizational Affiliation

    Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin, Madison, WI 53706.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Xrcc4-MYH7(1551-1609) chimera protein
A, B
209Homo sapiensMutation(s): 1 
Gene Names: XRCC4MYH7MYHCB
UniProt & NIH Common Fund Data Resources
Find proteins for Q13426 (Homo sapiens)
Explore Q13426 
Go to UniProtKB:  Q13426
PHAROS:  Q13426
GTEx:  ENSG00000152422 
Find proteins for P12883 (Homo sapiens)
Explore P12883 
Go to UniProtKB:  P12883
PHAROS:  P12883
GTEx:  ENSG00000092054 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP12883Q13426
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.548α = 90
b = 90.195β = 90
c = 102.717γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesHL111237

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2015-07-15
    Changes: Database references
  • Version 1.2: 2015-07-29
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations, Source and taxonomy
  • Version 1.4: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description