6FWS:
reference: DNA translocation mechanism of an XPD family helicase., Cheng K, Wigley DB, Elife. 2018 Dec 6;7. pii: 42400. doi: 10.7554/eLife.42400. PMID: 30520735

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