UDP-N-acetylglucosamine--peptide N-acetylglucosaminyltransferase GtfA subunit
UniProtKB accession: A0A0H2URG7
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Go to UniProtKB: A0A0H2URG7
UniProtKB description: Required for the polymorphic O-glycosylation of serine-rich repeat protein PsrP. Catalyzes the first step in glycosylation by transferring N-acetylglucosamine from UDP-GlcNAc to serine residues in PsrP (PubMed:24936067, PubMed:28246170). Part of the accessory SecA2/SecY2 system specifically required to export serine-rich repeat cell wall proteins encoded upstream in the same operon (Probable). The GtfA-GtfB complex adds GlcNAc from UDP-GlcNAc to PsrP (experimentally characterized with truncated PsrP-SSR1 constructs); this subunit alone has weak N-acetylglucosaminyl transferase activity that is 10-fold stimulated by GtfB. The complex requires at least a 25 residue-long peptide for activity; the in vitro assay has only been seen to glycosylate Ser residues (PubMed:24936067). The alpha linkage was shown in L.reuteri.
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