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Ishii N, Inoue S, Sano K, Takahashi S, Matsuo I. Synthesis of a fluorescent probe for measuring the activity of endo-β-N-acetylglucosaminidases recognizing hybrid-type N-glycans. Bioorg Med Chem 2024; 100:117612. [PMID: 38290307 DOI: 10.1016/j.bmc.2024.117612] [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: 11/24/2023] [Revised: 01/22/2024] [Accepted: 01/26/2024] [Indexed: 02/01/2024]
Abstract
A fluorescence-quenching-based assay system was constructed to determine the hydrolytic activity of endo-β-N-acetylglucosaminidases (ENGases) interacting with hybrid-type N-glycans. This was achieved using a dual-labeled fluorescent probe with a nonasaccharide structure. We produced the nonasaccharide skeleton by the stepwise glycosylation of the galactose residue on a galactosyl chitobiose derivative. Next, we introduced azido and acetoxy groups into the nonasaccharide derivative in a stepwise manner, which led to stereochemistry inversion at both the C-4 and C-2 hydroxy groups on its galactose residue. The protecting groups of the resulting nonasaccharide derivative were removed, and the derivative was labeled with an N-methylanthraniloyl group to obtain a reporter dye and a 2,4-dinitrophenyl group as a quenching molecule to obtain target probe 1. The use of this probe along with a microplate reader enabled a facile evaluation of the hydrolytic activities of ENGases Endo-H, Endo-M, Endo-F3, Endo-S, and Endo-CC. Furthermore, this probe could also assist in the search for novel ENGases that are specific to hybrid-type N-glycans.
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Affiliation(s)
- Nozomi Ishii
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Shusei Inoue
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan
| | - Kanae Sano
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan
| | - Satoshi Takahashi
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan
| | - Ichiro Matsuo
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
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Convergent synthesis of oligomannose-type glycans via step-economical construction of branch structures. Carbohydr Res 2023; 525:108764. [PMID: 36812846 DOI: 10.1016/j.carres.2023.108764] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/27/2023] [Accepted: 02/13/2023] [Indexed: 02/17/2023]
Abstract
Oligomannose-type glycans on glycoproteins are important signaling molecules in the glycoprotein quality control system in the endoplasmic reticulum. Recently, free oligomannose-type glycans generated by the hydrolysis of glycoproteins or dolichol pyrophosphate-linked oligosaccharides were recognized as important signals for immunogenicity. Hence, there is a high demand for pure oligomannose-type glycans for biochemical experiments; however, the chemical synthesis of glycans to achieve high-concentration products is laborious. In this study, we demonstrate a simple and efficient synthetic strategy for oligomannose-type glycans. Sequential regioselective α-mannosylation at the C-3 and C-6 positions of 2,3,4,6-unprotected galactose residues in galactosylchitobiose derivatives was demonstrated. Subsequently, the inversion of the configuration of the two hydroxy groups at the C-2 and C-4 positions of the galactose moiety was successfully carried out. This synthetic route reduces the number of the protection-deprotection reactions and is suitable for constructing different branching patterns of oligomannose-type glycans, such as M9, M5A, and M5B.
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Ishii N, Muto H, Nagata M, Sano K, Sato I, Iino K, Matsuzaki Y, Katoh T, Yamamoto K, Matsuo I. A fluorogenic probe for core-fucosylated glycan-preferred ENGase. Carbohydr Res 2023; 523:108724. [PMID: 36435009 DOI: 10.1016/j.carres.2022.108724] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 11/02/2022] [Accepted: 11/14/2022] [Indexed: 11/18/2022]
Abstract
A fluorescence-quenching-based assay system to determine the hydrolytic activity of endo-β-N-acetylglucosaminidases (ENGases), which act on the innermost N-acetylglucosamine (GlcNAc) residue of the chitobiose segment of core-fucosylated N-glycans, was constructed using a dual-labeled fluorescent probe with a hexasaccharide structure. The fluorogenic probe was evaluated using a variety of ENGases, including Endo-M W251N mutant, Endo-F3, and Endo-S, which recognize core fucosylated N-glycans. The occurrence of a hydrolysis reaction was detected by observing an increased fluorescence intensity, ultimately allowing the ENGase activities to be easily and quantitatively evaluated, with the exception of Endo-S. The obtained results clearly indicated the substrate specificities of the examined ENGases.
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Affiliation(s)
- Nozomi Ishii
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
| | - Hiroshi Muto
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan; Biologics Technology Research Laboratories, Daiichi Sankyo Co., Ltd., 3-5-1, Nihonbashi-honcho, Tokyo, 103-8426, Japan
| | - Mitsuo Nagata
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
| | - Kanae Sano
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
| | - Itsuki Sato
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
| | - Kenta Iino
- Glyco Synthetic Lab., Tokyo Chemical Industry Co., Ltd, 6-15-9 Toshima, Kita-ku, Tokyo, 114-0003, Japan
| | - Yuji Matsuzaki
- Glyco Synthetic Lab., Tokyo Chemical Industry Co., Ltd, 6-15-9 Toshima, Kita-ku, Tokyo, 114-0003, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Kenji Yamamoto
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, 921-8836, Japan
| | - Ichiro Matsuo
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan.
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2019-2020. MASS SPECTROMETRY REVIEWS 2022:e21806. [PMID: 36468275 DOI: 10.1002/mas.21806] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
This review is the tenth update of the original article published in 1999 on the application of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2020. Also included are papers that describe methods appropriate to analysis by MALDI, such as sample preparation techniques, even though the ionization method is not MALDI. The review is basically divided into three sections: (1) general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation, quantification and the use of arrays. (2) Applications to various structural types such as oligo- and polysaccharides, glycoproteins, glycolipids, glycosides and biopharmaceuticals, and (3) other areas such as medicine, industrial processes and glycan synthesis where MALDI is extensively used. Much of the material relating to applications is presented in tabular form. The reported work shows increasing use of incorporation of new techniques such as ion mobility and the enormous impact that MALDI imaging is having. MALDI, although invented nearly 40 years ago is still an ideal technique for carbohydrate analysis and advancements in the technique and range of applications show little sign of diminishing.
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Affiliation(s)
- David J Harvey
- Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, UK
- Department of Chemistry, University of Oxford, Oxford, Oxfordshire, United Kingdom
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Long Q, Gao J, Yan N, Wang P, Li M. (C 6F 5) 3B·(HF) n-catalyzed glycosylation of disarmed glycosyl fluorides and reverse glycosyl fluorides. Org Chem Front 2021. [DOI: 10.1039/d1qo00211b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
(C6F5)3B·(HF)n-catalyzed glycosylation of disarmed glycosyl fluorides and reverse glycosyl fluorides with structurally diverse nucleophiles has been achieved.
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Affiliation(s)
- Qing Long
- Key Laboratory of Marine Medicine
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Jingru Gao
- Key Laboratory of Marine Medicine
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Ningjie Yan
- Key Laboratory of Marine Medicine
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Peng Wang
- Key Laboratory of Marine Medicine
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Ming Li
- Key Laboratory of Marine Medicine
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
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