4U0W:
reference: Structural insight into operator dre-sites recognition and effector binding in the GntR/HutC transcription regulator NagR., Fillenberg SB, Grau FC, Seidel G, Muller YA, Nucleic Acids Res. 2015 Jan 6. pii: gku1374. PMID: 25564531

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