Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Homo 2-mer -A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 22305.03 
• Atom Count: 1509 
• Residue Count: 211 
• Unique protein chains: 2

2WWK

Crystal structure of the Titin M10-Obscurin like 1 Ig F17R mutant complex

• DOI: 10.2210/pdb2WWK/pdb

• Classification: TRANSFERASE/STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2009-10-25 Released: 2010-02-16 
• Deposition Author(s): Pernigo, S., Fukuzawa, A., Gautel, M., Steiner, R.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.259 
• R-Value Work: 0.219 

Literature

Structural Insight Into M-Band Assembly and Mechanics from the Titin-Obscurin-Like-1 Complex.

Pernigo, S., Fukuzawa, A., Bertz, M., Holt, M., Rief, M., Steiner, R.A., Gautel, M.

(2010) Proc.Natl.Acad.Sci.USA 107: 2908

• PubMed: 20133654 
• DOI: 10.1073/pnas.0913736107
• Primary Citation of Related Structures:  
  2WWM, 2WP3
• Also Cited By: 2Y9R


• PubMed Abstract: 
  

In the sarcomeric M-band, the giant ruler proteins titin and obscurin, its small homologue obscurin-like-1 (obsl1), and the myosin cross-linking protein myomesin form a ternary complex that is crucial for the function of the M-band as a mechanical link. Mutations in the last titin immunoglobulin (Ig) domain M10, which interacts with the N-terminal Ig-domains of obscurin and obsl1, lead to hereditary muscle diseases. The M10 domain is unusual not only in that it is a frequent target of disease-linked mutations, but also in that it is the only currently known muscle Ig-domain that interacts with two ligands--obscurin and obsl1--in different sarcomeric subregions. Using x-ray crystallography, we show the structural basis for titin M10 interaction with obsl1 in a novel antiparallel Ig-Ig architecture and unravel the molecular basis of titin-M10 linked myopathies. The severity of these pathologies correlates with the disruption of the titin-obsl1/obscurin complex. Conserved signature residues at the interface account for differences in affinity that direct the cellular sorting in cardiomyocytes. By engineering the interface signature residues of obsl1 to obscurin, and vice versa, their affinity for titin can be modulated similar to the native proteins. In single-molecule force-spectroscopy experiments, both complexes yield at forces of around 30 pN, much lower than those observed for the mechanically stable Z-disk complex of titin and telethonin, suggesting why even moderate weakening of the obsl1/obscurin-titin links has severe consequences for normal muscle functions.

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Organizational Affiliation: 

King's College London BHF Research Excellence Centre, Randall Division for Cell and Molecular Biophysics and Cardiovascular Division, New Hunt's House, Guy's Campus, London SE1 1UL, United Kingdom.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
OBSCURIN-LIKE PROTEIN 1	O	109	Homo sapiens	Mutation(s): 1  Gene Names: OBSL1 (KIAA0657)
Find proteins for O75147 (Homo sapiens) Go to Gene View: OBSL1 Go to UniProtKB:  O75147

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
TITIN	T	102	Homo sapiens	Mutation(s): 0  Gene Names: TTN EC: 2.7.11.1
Find proteins for Q8WZ42 (Homo sapiens) Go to Gene View: TTN Go to UniProtKB:  Q8WZ42

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	O	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	O	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.259 
• R-Value Work: 0.219 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 89.010	α = 90.00
b = 37.800	β = 92.99
c = 68.490	γ = 90.00

Software Package:

Software Name	Purpose
SCALA	data scaling
MOSFLM	data reduction
MOLREP	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-10-25 
• Released Date: 2010-02-16 
• Deposition Author(s): Pernigo, S., Fukuzawa, A., Gautel, M., Steiner, R.A.

Revision History 

• Version 1.0: 2010-02-16
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Version format compliance
• Version 1.2: 2011-08-24
  Type: Derived calculations