4X1E:
reference: Ligand binding specificity of RutR, a member of the TetR family of transcription regulators in Escherichia coli., Nguyen Le Minh P, de Cima S, Bervoets I, Maes D, Rubio V, Charlier D, FEBS Open Bio. 2015 Jan 28;5:76-84. doi: 10.1016/j.fob.2015.01.002. eCollection, 2015. PMID: 25685666

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