5JVV:
reference: Catalytic mechanism of a novel glycoside hydrolase family 16 ''elongating '' beta - transglycosylase., Qin Z, Yang S, Zhao L, You X, Yan Q, Jiang Z, J Biol Chem. 2016 Dec 12. pii: jbc.M116.762419. PMID: 27956553

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