1rfq

Actin Crystal Dynamics: Structural Implications for F-actin Nucleation, Polymerization and Branching Mediated by the Anti-parallel Dimer

spinqualitylabelsall models 1rfq, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1rfq is a 2 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3Å Ligands: ATP, LAR, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACTS_RABIT Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. Publication Abstract from PubMed Actin filament nucleation, polymerization, and branching are crucial steps in many forms of cell motility, cell shape, and intracellular organelle movements in a wide range of organisms. Previous biochemical data suggests that an anti-parallel actin dimer can incorporate itself into growing filamentous actin (F-actin) and has a role in branching. Furthermore, it is a widespread belief that nucleation is spawned from an actin trimer complex. Here we present the structures of actin dimers and trimers in two tetragonal crystal systems P4(3)2(1)2 and P4(3). Both crystal systems formed by an induced condensation transformation of a previously reported orthorhombic crystal system P2(1)2(1)2(1). Comparison between the three crystal systems demonstrates the dynamics and flexibility of actin-actin interactions. The dimer and trimer actin rearrangements observed between the three crystal systems may provide insight to in vivo actin-actin interactions that occur during the nucleation, polymerization, and branching of F-actin. Actin crystal dynamics: structural implications for F-actin nucleation, polymerization, and branching mediated by the anti-parallel dimer.,Reutzel R, Yoshioka C, Govindasamy L, Yarmola EG, Agbandje-McKenna M, Bubb MR, McKenna R J Struct Biol. 2004 Jun;146(3):291-301. PMID:15099571 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Actin 3D structures

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