4N2P:
reference: A tRNA splicing operon: Archease endows RtcB with dual GTP/ATP cofactor specificity and accelerates RNA ligation., Desai KK, Cheng CL, Bingman CA, Phillips GN Jr, Raines RT, Nucleic Acids Res. 2014 Apr 1;42(6):3931-42. doi: 10.1093/nar/gkt1375. Epub 2014 , Jan 16. PMID: 24435797

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