This domain consists of 7 stranded beta-sandwiches found in UDP-glucose-glycoprotein glucosyltransferase-like proteins [1]. UDP-g_GGTase is an important, central component of the QC system in the ER for checking that glycoproteins are folded correctly. This QC prevents incorrectly folded glycoproteins from leaving the ER [2,3].

1: Interdomain conformational flexibility underpins the activity of UGGT, the eukaryotic glycoprotein secretion checkpoint. Roversi P, Marti L, Caputo AT, Alonzi DS, Hill JC, Dent KC, Kumar A, Levasseur MD, Lia A, Waksman T, Basu S, Soto Albrecht Y, Qian K, McIvor JP, Lipp CB, Siliqi D, Vasiljevic S, Mohammed S, Lukacik P, Walsh MA, Santino A, Zitzmann N; Proc Natl Acad Sci U S A. 2017;114:8544-8549. PMID:28739903

2: The UDP-glucose:Glycoprotein Glucosyltransferase Is Organized in at Least Two Tightly Bound Domains from Yeast to Mammals. Guerin M, Parodi AJ; J Biol Chem 2003;278:20540-20546. PMID:12649273

3: Progesterone regulates the expression and activity of two mouse isoforms of the glycoprotein folding sensor UDP-Glc: glycoprotein glucosyltransferase (UGGT). Prados MB, Caramelo JJ, Miranda SE; Biochim Biophys Acta 2103;1833:3368-3374. PMID:24140206