Chondroitin sulfates are linear sulfated polysaccharides called glycosaminoglycans. They are important nutraceutical and pharmaceutical products that are biosynthesized through the action of chondroitin sulfotransferases on either an unsulfated chondroitin or a dermatan polysaccharide precursor. While the enzymes involved in the biosynthesis of chondroitin sulfates are well known, the cloning end expression of these membrane-bound Golgi enzymes continue to pose challenges. The major chondroitin-4-sulfotransferase, Homo sapiens C4ST-1, had been previously cloned and expressed from mammalian CHO, COS-7, and HEK 293 cells, and its activity was shown to require glycosylation. In the current study, a C4ST-1 construct was designed and expressed in both Escherichia coli and Pichia pastoris in its non-glycosylated and glycosylated forms. Both constructs showed similar activity albeit different kinetic parameters when acting on a microbially prepared unsulfated chondroitin substrate. Moreover, the glycosylated form of C4ST-1 showed lower stability than the non-glycosylated form.
Applied Microbiology and Biotechnology – Springer Journals
Published: Jul 31, 2017
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