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Tsukamoto Y, Tsukamoto N, Saiki W, Tashima Y, Furukawa JI, Kizuka Y, Narimatsu Y, Clausen H, Takeuchi H, Okajima T. Characterization of galactosyltransferase and sialyltransferase genes mediating the elongation of the extracellular O-GlcNAc glycans. Biochem Biophys Res Commun 2024; 703:149610. [PMID: 38359610 DOI: 10.1016/j.bbrc.2024.149610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 01/17/2024] [Accepted: 01/29/2024] [Indexed: 02/17/2024]
Abstract
O-GlcNAc is a unique post-translational modification found in cytoplasmic, nuclear, and mitochondrial proteins. In a limited number of extracellular proteins, O-GlcNAc modifications occur through the action of EOGT, which specifically modifies subsets of epidermal growth factor-like (EGF) domain-containing proteins such as Notch receptors. The abnormalities due to EOGT mutations in mice and humans and the increased EOGT expression in several cancers signify the importance of EOGT pathophysiology and extracellular O-GlcNAc. Unlike intracellular O-GlcNAc monosaccharides, extracellular O-GlcNAc extends to form elongated glycan structures. However, the enzymes involved in the O-GlcNAc glycan extension have not yet been reported. In our study, we comprehensively screened potential galactosyltransferase and sialyltransferase genes related to the canonical O-GlcNAc glycan pathway and revealed the essential roles of B4GALT1 and ST3GAL4 in O-GlcNAc glycan elongation in human HEK293 cells. These findings were confirmed by sequential glycosylation of Drosophila EGF20 in vitro by EOGT, β4GalT-1, and ST3Gal-IV. Thus, the findings from our study throw light on the specific glycosyltransferases that mediate O-GlcNAc glycan elongation in human HEK293 cells.
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Affiliation(s)
- Yohei Tsukamoto
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Natsumi Tsukamoto
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Wataru Saiki
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuko Tashima
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan; Institute for Glyco-core Research (iGCORE), Nagoya University, Nagoya, Japan
| | - Jun-Ichi Furukawa
- Institute for Glyco-core Research (iGCORE), Nagoya University, Nagoya, Japan
| | - Yasuhiko Kizuka
- Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan
| | - Yoshiki Narimatsu
- Department of Cellular and Molecular Medicine, Faculty of Health Sciences, Copenhagen Center for Glycomics, University of Copenhagen, Copenhagen, Denmark
| | - Henrik Clausen
- Department of Cellular and Molecular Medicine, Faculty of Health Sciences, Copenhagen Center for Glycomics, University of Copenhagen, Copenhagen, Denmark
| | - Hideyuki Takeuchi
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan; Department of Biochemistry, University of Shizuoka School of Pharmaceutical Sciences, Shizuoka, Japan.
| | - Tetsuya Okajima
- Department of Molecular Biochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan; Institute for Glyco-core Research (iGCORE), Nagoya University, Nagoya, Japan.
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