6SYF:
reference: Lysine acylation using conjugating enzymes for site-specific modification and ubiquitination of recombinant proteins., Hofmann R, Akimoto G, Wucherpfennig TG, Zeymer C, Bode JW, Nat Chem. 2020 Sep 14. pii: 10.1038/s41557-020-0528-y. doi:, 10.1038/s41557-020-0528-y. PMID: 32929246

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