Sulfhydryl Modification of the Yeast Wbp1p Inhibits Oligosaccharyl Transferase Activity

Abstract

Chemical labeling of the multimeric Saccharomyces cerevisiae oligosaccharyl transferase indicates that the 48 kDa Wbplp subunit is an integral component of the catalytically active enzyme. The enzyme was purified following chromatography on concanavalin A agarose, heparin agarose, Q-Sepharose, and hydroxyapatite media. The enzyme activity copurified with a tetrameric complex of polypeptide subunits. Two of the subunits have been identified as the yeast proteins Wbplp and Swplp by amino-teminal residue sequencing. A third subunit was identified as a variably glycosylated polypeptide near 64 kDa; preliminary amino acid sequencing showed no identity to known yeast proteins. Modification of a cysteine residue by the reagent methyl methanethiolsulfonate (MMTS) caused time-dependent and concentration-dependent inactivation of the enzyme. To identify the modified subunit of the transferase complex, the labeling reagent S-[(N-biotinoy1amino)ethyll methanethiolsulfonate (BMTS) was synthesized. Like MMTS, BMTS inactivated the oligosaccharyl transferase in a time-dependent manner. Additionally, incubation with the substrate (dolichylpyrophosphory1)-N,N'-diacetylchitobiose [Dol-PP(GlcNAc)_2] protected the enzyme from BMTS inactivation. When the purified enzyme complex was incubated with BMTS, Wbp lp alone was specifically labeled, thereby associating this subunit with catalysis and the binding of the dolichylpyrophosphoryl oligosaccharide substrate in the transferase reaction.