4GT1:
reference: Crystal structures of Mycobacterial MeaB and MMAA-like GTPases., Edwards TE, Baugh L, Bullen J, Baydo RO, Witte P, Thompkins K, Phan IQ, Abendroth J, Clifton MC, Sankaran B, Van Voorhis WC, Myler PJ, Staker BL, Grundner C, Lorimer DD, J Struct Funct Genomics. 2015 Jun;16(2):91-9. doi: 10.1007/s10969-015-9197-2., Epub 2015 Apr 2. PMID: 25832174

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