4GGG:
reference: Allosteric Inhibition of a Zinc-Sensing Transcriptional Repressor: Insights into the Arsenic Repressor (ArsR) Family., Campanello GC, Ma Z, Grossoehme NE, Guerra AJ, Ward BP, Dimarchi RD, Ye Y, Dann CE 3rd, Giedroc DP, J Mol Biol. 2013 Jan 23. pii: S0022-2836(13)00034-X. doi:, 10.1016/j.jmb.2013.01.018. PMID: 23353829

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