UDP-N-acetylglucosamine--peptide N-acetylglucosaminyltransferase stabilizing protein GtfB

UniProtKB accession:  Q79T00

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Required for polymorphic O-glycosylation of GspB, a serine-rich repeat cell wall protein encoded upstream in the same operon. A substrate-binding protein that is part of the accessory SecA2/SecY2 system specifically required to export GspB. The GtfA-GtfB complex adds GlcNAc from UDP-GlcNAc to GspB, attaching the first sugar residue. Upon coexpression in E.coli with GtfA glycosylates GspB constructs (PubMed:15489421). Binds the GspB protein substrate; alone this subunit only recognizes partially glycosylated GspB, but is constrained by GtfA to also recognize unglycosylated protein. The enzyme probably modifies its tertiary conformation by opening and closing its intersubunit interfaces to accomodate the increasingly glycosylated substrate (Probable).