Crystal structure of titin M3 domain

Experimental Data Snapshot

  • Resolution: 2.12 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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Structural diversity in the atomic resolution 3D fingerprint of the titin M-band segment.

Chatziefthimiou, S.D.Hornburg, P.Sauer, F.Mueller, S.Ugurlar, D.Xu, E.R.Wilmanns, M.

(2019) PLoS One 14: e0226693-e0226693

  • DOI: https://doi.org/10.1371/journal.pone.0226693
  • Primary Citation of Related Structures:  
    6H4L, 6HCI

  • PubMed Abstract: 

    In striated muscles, molecular filaments are largely composed of long protein chains with extensive arrays of identically folded domains, referred to as "beads-on-a-string". It remains a largely unresolved question how these domains have developed a unique molecular profile such that each carries out a distinct function without false-positive readout. This study focuses on the M-band segment of the sarcomeric protein titin, which comprises ten identically folded immunoglobulin domains. Comparative analysis of high-resolution structures of six of these domains ‒ M1, M3, M4, M5, M7, and M10 ‒ reveals considerable structural diversity within three distinct loops and a non-conserved pattern of exposed cysteines. Our data allow to structurally interpreting distinct pathological readouts that result from titinopathy-associated variants. Our findings support general principles that could be used to identify individual structural/functional profiles of hundreds of identically folded protein domains within the sarcomere and other densely crowded cellular environments.

  • Organizational Affiliation

    European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
105Homo sapiensMutation(s): 0 
Gene Names: TTN
UniProt & NIH Common Fund Data Resources
Find proteins for Q8WZ42 (Homo sapiens)
Explore Q8WZ42 
Go to UniProtKB:  Q8WZ42
GTEx:  ENSG00000155657 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8WZ42
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.12 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.061α = 90
b = 106.061β = 90
c = 75.481γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-28
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Database references
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references, Refinement description