1BT0:
reference: The rub family of ubiquitin-like proteins. Crystal structure of Arabidopsis rub1 and expression of multiple rubs in Arabidopsis., Rao-Naik C, delaCruz W, Laplaza JM, Tan S, Callis J, Fisher AJ, J Biol Chem 1998 Dec 25;273(52):34976-82. PMID: 9857029

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