5mw1 | pdb_00005mw1

cryoEM structure of crenactin double helical filament at 3.8A resolution

spinqualitylabelsall models 5mw1, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5mw1 is a 6 chain structure. This structure supersedes the now removed PDB entry 5ly4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The similarity of eukaryotic actin to crenactin, a filament-forming protein from the crenarchaeon Pyrobaculum calidifontis supports the theory of a common origin of Crenarchaea and Eukaryotes. Monomeric structures of crenactin and actin are similar, although their filament architectures were suggested to be different. Here we report that crenactin forms bona fide double helical filaments that show exceptional similarity to eukaryotic F-actin. With cryo-electron microscopy and helical reconstruction we solved the structure of the crenactin filament to 3.8 A resolution. When forming double filaments, the 'hydrophobic plug' loop in crenactin rearranges. Arcadin-2, also encoded by the arcade gene cluster, binds tightly with its C-terminus to the hydrophobic groove of crenactin. Binding is reminiscent of eukaryotic actin modulators such as cofilin and thymosin beta4 and arcadin-2 is a depolymeriser of crenactin filaments. Our work further supports the theory of shared ancestry of Eukaryotes and Crenarchaea. Crenactin forms actin-like double helical filaments regulated by arcadin-2.,Izore T, Kureisaite-Ciziene D, McLaughlin SH, Lowe J Elife. 2016 Nov 17;5. pii: e21600. doi: 10.7554/eLife.21600. PMID:27852434 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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