1H8B | pdb_00001h8b

EF-hands 3,4 from alpha-actinin / Z-repeat 7 from titin

• PDB DOI: https://doi.org/10.2210/pdb1H8B/pdb
• BMRB: 4453

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens, Oryctolagus cuniculus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2001-02-01 Released: 2001-08-30 
• Deposition Author(s): Atkinson, R.A., Joseph, C., Kelly, G., Muskett, F.W., Frenkiel, T.A., Nietlispach, D., Pastore, A.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 30 
• Selection Criteria: LOWEST ENERGIES 

Literature

Ca2+-Independent Binding of an EF-Hand Domain to a Novel Motif in the Alpha-Actinin-Titin Complex

Atkinson, R.A., Joseph, C., Kelly, G., Muskett, F.W., Frenkiel, T.A., Nietlispach, D., Pastore, A.

(2001) Nat Struct Biol 8: 853

• PubMed: 11573089 
• DOI: https://doi.org/10.1038/nsb1001-853
• Primary Citation Related Structures: 
  1H8B


• PubMed Abstract: 
  

  The interaction between alpha-actinin and titin, two modular muscle proteins, is essential for sarcomere assembly. We have solved the solution structure of a complex between the calcium-insensitive C-terminal EF-hand domain of alpha-actinin-2 and the seventh Z-repeat of titin. The structure of the complex is in a semi-open conformation and closely resembles that of myosin light chains in their complexes with heavy chain IQ motifs. However, no IQ motif is present in the Z-repeat, suggesting that the semi-open conformation is a general structural solution for calcium-independent recognition of EF-hand domains.

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Organizational Affiliation: 
• Division of Molecular Structure, National Institute for Medical Research, The Ridgeway, Mill Hill, London, NW7 1AA UK.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 13.74 kDa 
• Atom Count: 726 
• Modeled Residue Count: 96 
• Deposited Residue Count: 128 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-ACTININ 2, SKELETAL MUSCLE ISOFORM	A	75	Homo sapiens	Mutation(s): 1
UniProt & NIH Common Fund Data Resources
Find proteins for P35609 (Homo sapiens) Explore P35609  Go to UniProtKB:  P35609
PHAROS:  P35609 GTEx:  ENSG00000077522

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TITIN	B	53	Oryctolagus cuniculus	Mutation(s): 1
UniProt
Find proteins for O97791 (Oryctolagus cuniculus) Explore O97791  Go to UniProtKB:  O97791

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 30 
• Selection Criteria: LOWEST ENERGIES 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-08-30 
Deposition Author(s): Atkinson, R.A., Joseph, C., Kelly, G., Muskett, F.W., Frenkiel, T.A., Nietlispach, D., Pastore, A.

Revision History  

• Version 1.0: 2001-08-30
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-05-15
  Changes: Data collection, Database references, Other