4AYS:
reference: The structure of amylosucrase from Deinococcus radiodurans has an unusual open active-site topology., Skov LK, Pizzut-Serin S, Remaud-Simeon M, Ernst HA, Gajhede M, Mirza O, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Sep;69(Pt 9):973-8. doi:, 10.1107/S1744309113021714. Epub 2013 Aug 19. PMID: 23989143

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