1Z7M:
reference: Activation of the hetero-octameric ATP phosphoribosyl transferase through subunit interface rearrangement by a tRNA synthetase paralog., Champagne KS, Sissler M, Larrabee Y, Doublie S, Francklyn CS, J Biol Chem. 2005 Oct 7;280(40):34096-104. Epub 2005 Jul 28. PMID: 16051603

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