6OBJ:
reference: Mechanism of Filamentation-Induced Allosteric Activation of the SgrAI Endonuclease., Polley S, Lyumkis D, Horton NC, Structure. 2019 Oct 1;27(10):1497-1507.e3. doi: 10.1016/j.str.2019.08.001. Epub, 2019 Aug 22. PMID: 31447289

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).