2J8H | pdb_00002j8h

Structure of the immunoglobulin tandem repeat A168-A169 of titin

• PDB DOI: https://doi.org/10.2210/pdb2J8H/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2006-10-25 Released: 2007-08-21 
• Deposition Author(s): Mueller, S., Lange, S., Kursula, I., Gautel, M., Wilmanns, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free: 
  0.210 (Depositor), 0.213 (DCC) 
• R-Value Work: 
  0.193 (Depositor), 0.199 (DCC) 
• R-Value Observed: 
  0.194 (Depositor) 

Literature

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 Biology 371: 469

• PubMed: 17574571 
• DOI: https://doi.org/10.1016/j.jmb.2007.05.055
• Primary Citation 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.

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Organizational Affiliation: 
• EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 generated by PQS (software)

Macromolecule Content 

• Total Structure Weight: 21.86 kDa 
• Atom Count: 1,706 
• Modeled Residue Count: 195 
• Deposited Residue Count: 197 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TITIN	A	197	Homo sapiens	Mutation(s): 0  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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	B [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free:  0.210 (Depositor), 0.213 (DCC) 
• R-Value Work:  0.193 (Depositor), 0.199 (DCC) 
• R-Value Observed: 0.194 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.584	α = 90
b = 87.04	β = 90
c = 104.791	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-08-21 
Deposition Author(s): Mueller, S., Lange, S., Kursula, I., Gautel, M., Wilmanns, M.

Revision History  

• 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: 2024-05-08
  Changes: Data collection, Database references, Other