6HR8:
reference: Crystal structure of archaeal HMG-CoA reductase: insights into structural changes of the C-terminal helix of the class-I enzyme., Vogeli B, Shima S, Erb T, Wagner T, FEBS Lett. 2019 Jan 31. doi: 10.1002/1873-3468.13331. PMID: 30702149

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