3KH5:
reference: The Crystal Structure of Protein MJ1225 from Methanocaldococcus jannaschii Shows Strong Conservation of Key Structural Features Seen in the Eukaryal gamma-AMPK., Gomez-Garcia I, Oyenarte I, Martinez-Cruz LA, J Mol Biol. 2010 Apr 9. PMID: 20382158

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