3KNB

Crystal structure of the titin C-terminus in complex with obscurin-like 1

• PDB DOI: https://doi.org/10.2210/pdb3KNB/pdb
• Entry: 3KNB supersedes: 3IRG

• Classification: STRUCTURAL PROTEIN/STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2009-11-12 Released: 2009-12-01 
• Deposition Author(s): Sauer, F., Vahokoski, J., Wilmanns, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.195 
• R-Value Work: 0.164 
• R-Value Observed: 0.165 

Literature

Molecular basis of the head-to-tail assembly of giant muscle proteins obscurin-like 1 and titin.

Sauer, F., Vahokoski, J., Song, Y.H., Wilmanns, M.

(2010) EMBO Rep 11: 534-540

• PubMed: 20489725 
• DOI: https://doi.org/10.1038/embor.2010.65
• Primary Citation of Related Structures:  
  3KNB


• PubMed Abstract: 
  

  Large filament proteins in muscle sarcomeres comprise many immunoglobulin-like domains that provide a molecular platform for self-assembly and interactions with heterologous protein partners. We have unravelled the molecular basis for the head-to-tail interaction of the carboxyl terminus of titin and the amino-terminus of obscurin-like-1 by X-ray crystallography. The binary complex is formed by a parallel intermolecular beta-sheet that presents a novel immunoglobulin-like domain-mediated assembly mechanism in muscle filament proteins. Complementary binding data show that the assembly is entropy-driven rather than dominated data by specific polar interactions. The assembly observed leads to a V-shaped zipper-like arrangement of the two filament proteins.

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Organizational Affiliation: 

EMBL-Hamburg, Notkestrasse 85, Hamburg D-22603, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 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: 21.82 kDa 
• Atom Count: 1,849 
• Modelled Residue Count: 194 
• Deposited Residue Count: 207 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Titin	A	100	Homo sapiens	Mutation(s): 0  Gene Names: TTN EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q8WZ42 (Homo sapiens) Explore Q8WZ42  Go to UniProtKB:  Q8WZ42
PHAROS:  Q8WZ42 GTEx:  ENSG00000155657

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Obscurin-like protein 1	B	107	Homo sapiens	Mutation(s): 0  Gene Names: KIAA0657, OBSL1
UniProt & NIH Common Fund Data Resources
Find proteins for O75147 (Homo sapiens) Explore O75147  Go to UniProtKB:  O75147
PHAROS:  O75147 GTEx:  ENSG00000124006

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.195 
• R-Value Work: 0.164 
• R-Value Observed: 0.165 
• Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.91	α = 90
b = 60.91	β = 90
c = 42.05	γ = 120

Software Package:

Software Name	Purpose
MAR345	data collection
SHELXS	phasing
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-12-01 
Deposition Author(s): Sauer, F., Vahokoski, J., Wilmanns, M.
• This entry supersedes: 3IRG

Revision History  

• Version 1.0: 2009-12-01
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-11-01
  Changes: Advisory, Refinement description
• Version 1.3: 2024-02-21
  Changes: Advisory, Data collection, Database references, Derived calculations