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Oligosaccharyltransferase: A Gatekeeper of Health and Tumor Progression

Department of Glyco-Oncology and Medical Biochemistry, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka 541-8567, Japan
Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu 501-1193, Japan
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(23), 6074;
Received: 26 November 2019 / Revised: 28 November 2019 / Accepted: 28 November 2019 / Published: 2 December 2019
Oligosaccharyltransferase (OST) is a multi-span membrane protein complex that catalyzes the addition of glycans to selected Asn residues within nascent polypeptides in the lumen of the endoplasmic reticulum. This process, termed N-glycosylation, is a fundamental post-translational protein modification that is involved in the quality control, trafficking of proteins, signal transduction, and cell-to-cell communication. Given these crucial roles, N-glycosylation is essential for homeostasis at the systemic and cellular levels, and a deficiency in genes that encode for OST subunits often results in the development of complex genetic disorders. A growing body of evidence has also demonstrated that the expression of OST subunits is cell context-dependent and is frequently altered in malignant cells, thus contributing to tumor cell survival and proliferation. Importantly, a recently developed inhibitor of OST has revealed this enzyme as a potential target for the treatment of incurable drug-resistant tumors. This review summarizes our current knowledge regarding the functions of OST in the light of health and tumor progression, and discusses perspectives on the clinical relevance of inhibiting OST as a tumor treatment. View Full-Text
Keywords: endoplasmic reticulum; N-glycosylation; oligosaccharyltransfease; tumors endoplasmic reticulum; N-glycosylation; oligosaccharyltransfease; tumors
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Harada, Y.; Ohkawa, Y.; Kizuka, Y.; Taniguchi, N. Oligosaccharyltransferase: A Gatekeeper of Health and Tumor Progression. Int. J. Mol. Sci. 2019, 20, 6074.

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