5TT6:
reference: Two-metal versus one-metal mechanisms of lysine adenylylation by ATP-dependent and NAD+-dependent polynucleotide ligases., Unciuleac MC, Goldgur Y, Shuman S, Proc Natl Acad Sci U S A. 2017 Feb 21. pii: 201619220. doi:, 10.1073/pnas.1619220114. PMID: 28223499

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