5JOE

Crystal structure of I81 from titin

• PDB DOI: https://doi.org/10.2210/pdb5JOE/pdb

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


• Deposited: 2016-05-02 Released: 2016-08-17 
• Deposition Author(s): Fleming, J., Zhou, T., Bogomolovas, J., Labeit, S., Mayans, O.
• Funding Organization(s): Leducq Foundation

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.218 
• R-Value Work: 0.177 
• R-Value Observed: 0.179 

Literature

CARP interacts with titin at a unique helical N2A sequence and at the domain Ig81 to form a structured complex.

Zhou, T., Fleming, J.R., Franke, B., Bogomolovas, J., Barsukov, I., Rigden, D.J., Labeit, S., Mayans, O.

(2016) FEBS Lett 590: 3098-3110

• PubMed: 27531639 
• DOI: https://doi.org/10.1002/1873-3468.12362
• Primary Citation of Related Structures:  
  5JOE


• PubMed Abstract: 
  

  The cardiac ankyrin repeat protein (CARP) is up-regulated in the myocardium during cardiovascular disease and in response to mechanical or toxic stress. Stress-induced CARP interacts with the N2A spring region of the titin filament to modulate muscle compliance. We characterize the interaction between CARP and titin-N2A and show that the binding site in titin spans the dual domain UN2A-Ig81. We find that the unique sequence UN2A is not structurally disordered, but that it has a stable, elongated α-helical fold that possibly acts as a constant force spring. Our findings portray CARP/titin-N2A as a structured node and help to rationalize the molecular basis of CARP mechanosensing in the sarcomeric I-band.

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Organizational Affiliation: 

Department of Biology, University of Konstanz, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 10.64 kDa 
• Atom Count: 952 
• Modelled Residue Count: 92 
• Deposited Residue Count: 92 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Titin	A	92	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

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	C [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
IPA	B [auth A]	ISOPROPYL ALCOHOL C3 H8 O KFZMGEQAYNKOFK-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.218 
• R-Value Work: 0.177 
• R-Value Observed: 0.179 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.31	α = 90
b = 115.31	β = 90
c = 52.23	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2016-08-17 
Deposition Author(s): Fleming, J., Zhou, T., Bogomolovas, J., Labeit, S., Mayans, O.

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Funding Organization	Location	Grant Number
Leducq Foundation		--

Revision History  

• Version 1.0: 2016-08-17
  Type: Initial release
  
• Version 1.1: 2016-08-31
  Changes: Database references
• Version 1.2: 2016-10-05
  Changes: Database references
• Version 1.3: 2024-01-10
  Changes: Data collection, Database references, Refinement description