3TY5:
reference: The adenylyltransferase domain of bacterial Pnkp defines a unique RNA ligase family., Smith P, Wang LK, Nair PA, Shuman S, Proc Natl Acad Sci U S A. 2012 Feb 14;109(7):2296-301. Epub 2012 Jan 27. PMID: 22308407

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