4TTP:
reference: Crystal structure of Legionella pneumophila dephospho-CoA kinase reveals a non-canonical conformation of P-loop., Gong X, Chen X, Yu D, Zhang N, Zhu Z, Niu L, Mao Y, Ge H, J Struct Biol. 2014 Oct 25;188(3):233-239. doi: 10.1016/j.jsb.2014.10.008. PMID: 25449315

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