How the glycosyltransferase OGT catalyzes amide bond cleavage

September 12th, 2016 by John Janetzko

Nature Chemical Biology 12, 899 (2016). doi:10.1038/nchembio.2173

Authors: John Janetzko, Sunia A Trauger, Michael B Lazarus & Suzanne Walker

The essential human enzyme O-linked β-N-acetylglucosamine transferase (OGT), known for modulating the functions of nuclear and cytoplasmic proteins through serine and threonine glycosylation, was unexpectedly implicated in the proteolytic maturation of the cell cycle regulator host cell factor-1 (HCF-1). Here we show that HCF-1 cleavage occurs via glycosylation of a glutamate side chain followed by on-enzyme formation of an internal pyroglutamate, which undergoes spontaneous backbone hydrolysis.