1UZX:
reference: Structural insights into endosomal sorting complex required for transport (ESCRT-I) recognition of ubiquitinated proteins., Teo H, Veprintsev DB, Williams RL, J Biol Chem. 2004 Jul 2;279(27):28689-96. Epub 2004 Mar 24. PMID: 15044434

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