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Studies on oligosaccharyl transferase in yeast.

In yeast, OT consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. All yeast OT subunits have been cloned and sequenced (Kelleher et al., 1992; 2003; Kelleher & Gilmore, 1997; Kumar et al., 1994; 1995; Breuer & Bause, 1995) and the structure of one of them, Ost4p, has been solved by NMR (Zubkov et al., 2004). Very recently, the preliminary crystal structure of the lumenal domain of an archaeal Stt3p homolog has been reported (Mayumi et al., 2007). Homologs of all OT subunits have been identified in higher eukaryotic organisms (Kelleher et al., 1992; 2003; Kumar et al., 1994; Kelleher & Gilmore, 1997).