Sandbox 154: Difference between revisions
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== Structure == | == Structure == | ||
<applet load='2zwh' size='222' color='black' frame='true' align='left' caption='Filamentous Actin (F-actin)' scene='Sandbox_154/2zwh_black_domains/1'/> | <applet load='2zwh' size='222' color='black' frame='true' align='left' caption='Filamentous Actin (F-actin)' scene='Sandbox_154/2zwh_black_domains/1'/> | ||
=== History of the structure === | |||
The F-actin protein 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. and over this time, despite the importance of F-actin in eukaryotic cells, this speculated structure was accepted. A higher resolution structure was only recently deposited in the PDB databank in Decemeber 2008 by Oda et al. <ref> 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: [http://www.ncbi.nlm.nih.gov/pubmed/19158791/ 19158791]</ref>. | |||
=== Domains of F-actin Unit === | === Domains of F-actin Unit === | ||
Structure of a unit of F-actin with domains from a single polypeptide chain. Note the cleft between the two domains houses the nucleotide phosphate ligand and the Ca2+ metal ion ligand. | Structure of a unit of F-actin with domains from a single polypeptide chain. Note the cleft between the two domains houses the nucleotide phosphate ligand and the Ca2+ metal ion ligand. | ||
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The cleavage of the gamma-phosphoryl from the bound ATP is a result of a conformational change upon binding that moves the Gln137 residue closer to the ATP-Ca2+ ligand. Release of the inorganic phosphate occurs via the conformational change of the flexible "D-loop" into an ordered alpha-helix<ref>graceffa</ref>. | The cleavage of the gamma-phosphoryl from the bound ATP is a result of a conformational change upon binding that moves the Gln137 residue closer to the ATP-Ca2+ ligand. Release of the inorganic phosphate occurs via the conformational change of the flexible "D-loop" into an ordered alpha-helix<ref>graceffa</ref>. | ||
=== Polymer F-actin === | === Polymer F-actin === | ||