1QHG:
reference: DNA binding mediates conformational changes and metal ion coordination in the active site of PcrA helicase., Soultanas P, Dillingham MS, Velankar SS, Wigley DB, J Mol Biol 1999 Jul 2;290(1):137-48. PMID: 10388562

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