1GZ5:
reference: Insights into trehalose synthesis provided by the structure of the retaining glucosyltransferase OtsA., Gibson RP, Turkenburg JP, Charnock SJ, Lloyd R, Davies GJ, Chem Biol 2002 Dec;9(12):1337-46. PMID: 12498887

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