Journal
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
Volume 76, Issue 2, Pages 353-364Publisher
WILEY
DOI: 10.1002/prot.22350
Keywords
actin; molecular dynamics simulation; actin polymerization; conformational change; nucleotide
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Funding
- Ministry of Science, Research and the Arts of Baden-Wurttemberg (Biomimetische Modelle der Zellmechanik) [24-7532.22-19-12/1]
- Deutsche Forschungsgemeinschaft [SM 63/8-1,2]
- DOE Laboratory-Directed Research and Development
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The assembly of monomeric G-actin into filamentous F-actin is nucleotide dependent: ATP-G-actin is favored for filament growth at the barbed end of F-actin, whereas ADP-G-actin tends to dissociate from the pointed end. Structural differences between ATP- and ADPG-actin are examined here using multiple molecular dynamics simulations. The open and closed conformational states of G-actin in aqueous solution are characterized, with either ATP or ADP in the nucleotide binding pocket. With both ATP and ADP bound, the open state closes in the absence of actin-bound profilin. The position of the nucleotide in the protein is found to be correlated with the degree of opening of the active site cleft. Further, the simulations reveal the existence of a structurally well-defined, compact, superclosed state of ATP-G-actin, as yet unseen crystallographically and absent in the ADPG-actin simulations. The superclosed state resembles structurally the actin monomer in filament models derived from fiber diffraction and is putatively the polymerization competent conformation of ATP-G-actin.
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