Movie S2.
Morphing from G to F-actin, overall side-view. Actin subdomains 1 and 2, light blue ribbons. Actin subdomains 3 and 4, yellow ribbons. Actin subdomains 1 and 3 interface α-helix, cyan cartoon. ATP, sticks. Magnesium ion, grey sphere.
Structural evidence for the roles of divalent cations in actin polymerization and activation of ATP hydrolysis
PNAS. 2018. 115:10345-10350 DOI: 10.1073/pnas.1806394115