Structure of the immunoglobulin tandem repeat of titin A168-A169

Experimental Data Snapshot

  • Resolution: 2.49 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.252 

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This is version 1.3 of the entry. See complete history


Rigid Conformation of an Immunoglobulin Domain Tandem Repeat in the A-Band of the Elastic Muscle Protein Titin

Mueller, S.Lange, S.Gautel, M.Wilmanns, M.

(2007) J Mol Biol 371: 469

  • DOI: https://doi.org/10.1016/j.jmb.2007.05.055
  • Primary Citation of Related Structures:  
    2J8H, 2J8O

  • PubMed Abstract: 

    Most of the structure of the giant muscle protein titin is formed by small modular domains. Many of them are predicted to be arranged in repeats with short linkers that may be key determinants of the peculiar elastic properties of titin. Here, we present the molecular structure of a tandem arrangement of two immunoglobulin-like domains, A168 and A169, located within the A-band segment of titin. The two domains are connected by a 17 residue long beta-strand and form a common interface. Based on these data, we establish general principles to estimate the amount of conformational flexibility of tandem domain motifs in titin. An unusual bulge within the second domain, A169, is directly involved into binding to a sarcomeric ligand, MURF-1, thus suggesting a dual role of this tandem for both the mechanical properties of titin and for sarcomeric signaling.

  • Organizational Affiliation

    EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
197Homo sapiensMutation(s): 0 
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: 2.49 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.252 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.56α = 90
b = 122.487β = 90
c = 98.699γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-07-24
    Changes: Data collection
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description