2IYE:
reference: Sulfate acts as phosphate analog on the monomeric catalytic fragment of the CPx-ATPase CopB from Sulfolobus solfataricus., Lubben M, Guldenhaupt J, Zoltner M, Deigweiher K, Haebel P, Urbanke C, Scheidig AJ, J Mol Biol. 2007 Jun 1;369(2):368-85. Epub 2007 Mar 20. PMID: 17434529

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