1Q1K:
reference: The structure of Escherichia coli ATP-phosphoribosyltransferase: identification of substrate binding sites and mode of AMP inhibition., Lohkamp B, McDermott G, Campbell SA, Coggins JR, Lapthorn AJ, J Mol Biol 2004 Feb 6;336(1):131-44. PMID: 14741209

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