Kelley Moremen, PhD, is Distinguished Research Professor of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, University of Georgia. He received his PhD at Vanderbilt University and Postdoctoral training at MIT. Dr. Moremen is a leader in the structure, function, roles, and regulation of enzymes involved in mammalian glycan biosynthesis and catabolism. The presentation will discuss the development of a recombinant platform for production of all mammalian glycosyltransferases, glycosidases, and sulfotransferases (target gene list of >350 coding regions) in baculovirus, and mammalian cells to facilitate biochemical, enzymatic and structural studies on theenzymes and applications to chemoenzymatic synthesis.


Glycan structures on cell surface and secreted glycoproteins play critical roles in biological recognition and targeting events in animal systems. The enzymes that synthesize these structuresreside in membranes of the secretory pathway and modify glycoproteins in transit to the cell surface. These enzymes are generally poorly understood largely because they are challenging targets for functional expression even in eukaryotic hosts. We have established library of expression constructs encoding all human glycosylation enzymes (target gene list of ~350 coding regions) as secreted catalytic domain fusion proteins for recombinant production in HEK293 cells and baculovirus-infected insect cells. Comparison of expression levels in each host system indicates similar trends where most proteins are well-expressed but only a subset are efficiently secreted. However, many of the enzymes are more effectively produced and secreted in one recombinant host system or the other suggesting that differences in host secretory machinery can influence the yield of recombinant products. This presentation will summarize our strategies for expression and downstream workflows for biochemical and structural studies with goals to advance our understanding of the enzymatic machinery for glycan synthesis and modification.