This domain is found in Oligosaccharyl transferase from Pyrococcus furiosus (OST, also known as AglB-L) and similar archaeal sequences. OST catalyses the co-translational transfer of an oligosaccharide from a lipid donor to an asparagine residue in nascent polypeptide chains. This protein is organised into four regions: a N-terminal half (Pfam:PF02516), the central core (CC) domain that includes the IS (insert) domain (Pfam:PF18246) and two peripheral domains, P1 (this entry) and P2 (Pfam:PF18235). This domain, which consists mainly of beta-strands, encircles the central core domain [1].

1: Structure-guided identification of a new catalytic motif of oligosaccharyltransferase. Igura M, Maita N, Kamishikiryo J, Yamada M, Obita T, Maenaka K, Kohda D; EMBO J. 2008;27:234-243. PMID:18046457

2: Crystallographic and NMR evidence for flexibility in oligosaccharyltransferases and its catalytic significance. Nyirenda J, Matsumoto S, Saitoh T, Maita N, Noda NN, Inagaki F, Kohda D; Structure. 2013;21:32-41. PMID:23177926

3: Rational design of crystal contact-free space in protein crystals for analyzing spatial distribution of motions within protein molecules. Matsuoka R, Shimada A, Komuro Y, Sugita Y, Kohda D; Protein Sci. 2016;25:754-768. PMID:26694222