2G7H:
reference: Structural studies of MJ1529, an O(6)-methylguanine-DNA methyltransferase., Roberts A, Pelton JG, Wemmer DE, Magn Reson Chem. 2006 Jul 6;44(S1):71-82. PMID: 16826543

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