1UYP:
reference: The three-dimensional structure of invertase (beta-fructosidase) from Thermotoga maritima reveals a bimodular arrangement and an evolutionary relationship between retaining and inverting glycosidases., Alberto F, Bignon C, Sulzenbacher G, Henrissat B, Czjzek M, J Biol Chem. 2004 Apr 30;279(18):18903-10. Epub 2004 Feb 18. PMID: 14973124

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