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Kumar, V. et al.

Kumar, Heinemann, Ozols,

Interleukin-2 induces N-glycosylation in T-cells: characterization of human lymphocyte oligosaccharyltransferase.

We have investigated the enzyme mediating N-glycosylation in "resting" and activated lymphocytes. Normal peripheral blood lymphocytes (PBLs) were found to have low activity for glycosylation of a synthetic glycan acceptor peptide. N-glycosylation activity increased 10-fold after mitogen activation of PBLs. N-glycosylation activity remained elevated during long-term culture and expansion of human lymphocytes when growth was supported by interleukin-2. To our knowledge, this is the first biochemical evidence for induction of endoplasmic reticulum functions during T-cell activation. The enzyme mediating N-glycosylation in lymphocytes was localized predominantly but not entirely to a microsomal organelle by subcellular fractionation. After solubilization and 85-fold purification from salt-washed microsomes, the enzyme preparation contained four predominant proteins. N-terminal sequence analysis identified the proteins as ribophorin I, ribophorin II (doublet), and a 50-kDa homologue of Wbp1, a yeast protein essential for N-glycosylation.[1]

References

Interleukin-2 induces N-glycosylation in T-cells: characterization of human lymphocyte oligosaccharyltransferase. Kumar, V., Heinemann, F.S., Ozols, J. Biochem. Biophys. Res. Commun. (1998) [Pubmed]

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