1QUU

CRYSTAL STRUCTURE OF TWO CENTRAL SPECTRIN-LIKE REPEATS FROM ALPHA-ACTININ

• PDB DOI: https://doi.org/10.2210/pdb1QUU/pdb

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


• Deposited: 1999-07-03 Released: 1999-08-20 
• Deposition Author(s): Djinovic-Carugo, K., Young, P., Gautel, M., Saraste, M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 
  0.310 (Depositor) 
• R-Value Work: 
  0.229 (Depositor) 
• R-Value Observed: 
  0.229 (Depositor) 

Literature

Structure of the alpha-actinin rod: molecular basis for cross-linking of actin filaments.

Djinovic-Carugo, K., Young, P., Gautel, M., Saraste, M.

(1999) Cell 98: 537-546

• PubMed: 10481917 
• DOI: https://doi.org/10.1016/s0092-8674(00)81981-9
• Primary Citation of Related Structures:  
  1QUU


• PubMed Abstract: 
  

  We have determined the crystal structure of the two central repeats in the alpha-actinin rod at 2.5 A resolution. The repeats are connected by a helical linker and form a symmetric, antiparallel dimer in which the repeats are aligned rather than staggered. Using this structure, which reveals the structural principle that governs the architecture of alpha-actinin, we have devised a plausible model of the entire alpha-actinin rod. The electrostatic properties explain how the two alpha-actinin subunits assemble in an antiparallel fashion, placing the actin-binding sites at both ends of the rod. This molecular architecture results in a protein that is able to form cross-links between actin filaments.

---

Organizational Affiliation: 

Structural Biology Programme, European Molecular Biology Laboratory, Heidelberg, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 29.28 kDa 
• Atom Count: 2,185 
• Modelled Residue Count: 248 
• Deposited Residue Count: 250 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HUMAN SKELETAL MUSCLE ALPHA-ACTININ 2	A	250	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P35609 (Homo sapiens) Explore P35609  Go to UniProtKB:  P35609
PHAROS:  P35609 GTEx:  ENSG00000077522

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free:  0.310 (Depositor) 
• R-Value Work:  0.229 (Depositor) 
• R-Value Observed: 0.229 (Depositor) 

Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.05	α = 90
b = 60.05	β = 90
c = 390.81	γ = 120

Software Package:

Software Name	Purpose
SHARP	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-08-20 
Deposition Author(s): Djinovic-Carugo, K., Young, P., Gautel, M., Saraste, M.

Revision History  

• Version 1.0: 1999-08-20
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-01-31
  Changes: Advisory, Experimental preparation
• Version 1.4: 2018-05-30
  Changes: Advisory, Data collection, Derived calculations
• Version 1.5: 2024-02-14
  Changes: Advisory, Data collection, Database references