From Proteopedia

spinqualitylabelsall models PDB ID 2zwh Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
2zwh, resolution 3.30Å ()
Ligands:	,
Non-Standard Residues:
Structural annotation: Resources: InterPro : Ipr004000, Ipr020902, Ipr004001 Pfam : PF00022 UniProt : P68135
Resources:	FirstGlance, OCA, RCSB, PDBsum
Coordinates:	save as pdb, mmCIF, xml

F-Actin

Filamentous actin (F-actin) is also referred to as microfilament ^[1] and is a highly conserved proteinous component found near ubiquitously in eukaryotic cytoskeletons. F-actin and other actin proteins generally provide a structural role to the cell.

History

The F-actin structure was discovered by Straub in 1942. The structure was speculated based on a low-resolution x-ray crystallograph found in 1990 by Holmes et al. The structure was deposited in the PDB databank in Decemeber 2008 by Oda et al. ^[2].

Introduction

Assembly

Structure of F-actin

spinqualitylabelsall models Filamentous Actin (F-actin) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Structurally, F-actin appears like a double right-handed helix. It is actually composed of 13 actin units for every 6 left-handed turns, which each have 166° rotations, occurring over 350 Å . ^[3]. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Monomeric Unit - G-actin

spinqualitylabelsall models Globular Actin (G-actin): PDB identifier 1J6Z. Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

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Domains

Function

Enzymatic Role

Active Site

Ligand

Structural Role

References

1. ↑ Microfilament - Wikipedia, the free encyclopedia. http://en.wikipedia.org/wiki/Microfilaments. Date accessed: March 16th, 2010.
2. ↑ Oda T, Iwasa M, Aihara T, Maéda Y, and Narita A. 2009. The nature of the globular-to fibrous actin transition. Nature,457(7228):441-445. PMID: 19158791
3. ↑ Holmes, K.C., Popp, D., Gebhard, W. and Kabsch, W. 1990. Atomic model of the actin filament. Nature,347(6288):44-49. PMID: 2395461