1WVQ:
reference: The structure of an ancient conserved domain establishes a structural basis for stable histidine phosphorylation and identifies a new family of adenosine-specific kinases., Lott JS, Paget B, Johnston JM, Delbaere LT, Sigrell-Simon JA, Banfield MJ, Baker EN, J Biol Chem. 2006 Aug 4;281(31):22131-41. Epub 2006 May 30. PMID: 16737961

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