2DU6:
reference: Structural insights into the first step of RNA-dependent cysteine biosynthesis in archaea., Fukunaga R, Yokoyama S, Nat Struct Mol Biol. 2007 Apr;14(4):272-9. Epub 2007 Mar 11. PMID: 17351629

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