5YW5:
reference: Crystal structures of APRT from Francisella tularensis: An N-H N hydrogen bond imparts adenine specificity in adenine phosporibosyltransferases., Pavithra GC, Ramagopal UA, FEBS J. 2018 Apr 25. doi: 10.1111/febs.14481. PMID: 29694705

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