5FM5

Crystal structure of the myomesin:obscurin-like-1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Binding of Myomesin to Obscurin-Like-1 at the Muscle M-Band Provides a Strategy for Isoform-Specific Mechanical Protection.

Pernigo, S.Fukuzawa, A.Beedle, A.E.Holt, M.Round, A.Pandini, A.Garcia-Manyes, S.Gautel, M.Steiner, R.A.

(2017) Structure 25: 107-120

  • DOI: https://doi.org/10.1016/j.str.2016.11.015
  • Primary Citation of Related Structures:  
    5FM4, 5FM5, 5FM8

  • PubMed Abstract: 

    The sarcomeric cytoskeleton is a network of modular proteins that integrate mechanical and signaling roles. Obscurin, or its homolog obscurin-like-1, bridges the giant ruler titin and the myosin crosslinker myomesin at the M-band. Yet, the molecular mechanisms underlying the physical obscurin(-like-1):myomesin connection, important for mechanical integrity of the M-band, remained elusive. Here, using a combination of structural, cellular, and single-molecule force spectroscopy techniques, we decode the architectural and functional determinants defining the obscurin(-like-1):myomesin complex. The crystal structure reveals a trans-complementation mechanism whereby an incomplete immunoglobulin-like domain assimilates an isoform-specific myomesin interdomain sequence. Crucially, this unconventional architecture provides mechanical stability up to forces of ∼135 pN. A cellular competition assay in neonatal rat cardiomyocytes validates the complex and provides the rationale for the isoform specificity of the interaction. Altogether, our results reveal a novel binding strategy in sarcomere assembly, which might have implications on muscle nanomechanics and overall M-band organization.


  • Organizational Affiliation

    Randall Division of Cell and Molecular Biophysics, King's College London, London SE1 1UL, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MYOMESIN-1A [auth M],
B [auth N]
231Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P52179 (Homo sapiens)
Explore P52179 
Go to UniProtKB:  P52179
PHAROS:  P52179
GTEx:  ENSG00000101605 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52179
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
OBSCURIN-LIKE-1C [auth O],
D [auth P]
98Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O75147 (Homo sapiens)
Explore O75147 
Go to UniProtKB:  O75147
PHAROS:  O75147
GTEx:  ENSG00000124006 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75147
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.18α = 90
b = 134.38β = 92.5
c = 68.39γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2016-12-07
    Changes: Database references
  • Version 1.2: 2016-12-28
    Changes: Database references
  • Version 1.3: 2017-03-01
    Changes: Database references
  • Version 1.4: 2024-01-10
    Changes: Data collection, Database references, Other, Refinement description