Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 253.98 kDa 
• Atom Count: 17766 
• Modelled Residue Count: 2250 
• Deposited Residue Count: 2250 
• Unique protein chains: 1

2Y83

Actin filament pointed end

• PDB DOI: 10.2210/pdb2Y83/pdb
• EM Map EMD-1872:EMDBEMDataResource

• Classification: CONTRACTILE PROTEIN
• Organism(s): Oryctolagus cuniculus
• Mutation(s): No 


• Deposited: 2011-02-02 Released: 2011-03-30 
• Deposition Author(s): Narita, A., Oda, T., Maeda, Y.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 22.9 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural Basis for the Slow Dynamics of the Actin Filament Pointed End.

Narita, A., Oda, T., Maeda, Y.

(2011) EMBO J 30: 1230

• PubMed: 21378753 
• DOI: 10.1038/emboj.2011.48
• Primary Citation of Related Structures:  
  2Y83


• PubMed Abstract: 
  

The actin filament has clear polarity where one end, the pointed end, has a much slower polymerization and depolymerization rate than the other end, the barbed end. This intrinsic difference of the ends significantly affects all actin dynamics in the cell, which has central roles in a wide spectrum of cellular functions. The detailed mechanism underlying this difference has remained elusive, because high-resolution structures of the filament ends have not been available. Here, we present the structure of the actin filament pointed end obtained using a single particle analysis of cryo-electron micrographs. We determined that the terminal pointed end subunit is tilted towards the penultimate subunit, allowing specific and extra loop-to-loop inter-strand contacts between the two end subunits, which is not possible in other parts of the filament. These specific contacts prevent the end subunit from dissociating. For elongation, the loop-to-loop contacts also inhibit the incorporation of another actin monomer at the pointed end. These observations are likely to account for the less dynamic pointed end.

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Organizational Affiliation: 

Structural Biology Research Center and Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya, Japan. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ACTIN, ALPHA SKELETAL MUSCLE	A [auth O], B [auth P], C [auth Q], D [auth R], E [auth S], F [auth T]	375	Oryctolagus cuniculus	Mutation(s): 0  Gene Names: ACTA1, ACTA
UniProt
Find proteins for P68135 (Oryctolagus cuniculus) Explore P68135  Go to UniProtKB:  P68135

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	G [auth O], I [auth P], K [auth Q], M [auth R], O [auth S], Q [auth T]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
CA	H [auth O], J [auth P], L [auth Q], N [auth R], P [auth S], R [auth T]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 22.9 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-02-02 
• Released Date: 2011-03-30 
Deposition Author(s): Narita, A., Oda, T., Maeda, Y.

Revision History  

• Version 1.0: 2011-03-30
  Type: Initial release
  
• Version 1.1: 2013-03-20
  Changes: Other, Version format compliance
• Version 1.2: 2018-10-03
  Changes: Data collection