5XQM:
reference: Structural and functional analysis of SMO-1, the SUMO homolog in Caenorhabditis elegans., Surana P, Gowda CM, Tripathi V, Broday L, Das R, PLoS One. 2017 Oct 18;12(10):e0186622. doi: 10.1371/journal.pone.0186622., eCollection 2017. PMID: 29045470

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