5ZYO:
reference: Untying a Knotted SPOUT RNA Methyltransferase by Circular Permutation Results in a Domain-Swapped Dimer., Ko KT, Hu IC, Huang KF, Lyu PC, Hsu SD, Structure. 2019 May 14. pii: S0969-2126(19)30126-1. doi:, 10.1016/j.str.2019.04.004. PMID: 31104814

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