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Bloch JS, John A, Mao R, Mukherjee S, Boilevin J, Irobalieva RN, Darbre T, Scott NE, Reymond JL, Kossiakoff AA, Goddard-Borger ED, Locher KP. Structure, sequon recognition and mechanism of tryptophan C-mannosyltransferase. Nat Chem Biol 2023; 19:575-584. [PMID: 36604564 PMCID: PMC10154233 DOI: 10.1038/s41589-022-01219-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 10/28/2022] [Indexed: 01/07/2023]
Abstract
C-linked glycosylation is essential for the trafficking, folding and function of secretory and transmembrane proteins involved in cellular communication processes. The tryptophan C-mannosyltransferase (CMT) enzymes that install the modification attach a mannose to the first tryptophan of WxxW/C sequons in nascent polypeptide chains by an unknown mechanism. Here, we report cryogenic-electron microscopy structures of Caenorhabditis elegans CMT in four key states: apo, acceptor peptide-bound, donor-substrate analog-bound and as a trapped ternary complex with both peptide and a donor-substrate mimic bound. The structures indicate how the C-mannosylation sequon is recognized by this CMT and its paralogs, and how sequon binding triggers conformational activation of the donor substrate: a process relevant to all glycosyltransferase C superfamily enzymes. Our structural data further indicate that the CMTs adopt an unprecedented electrophilic aromatic substitution mechanism to enable the C-glycosylation of proteins. These results afford opportunities for understanding human disease and therapeutic targeting of specific CMT paralogs.
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Affiliation(s)
- Joël S Bloch
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland
- Laboratory of Molecular Neurobiology and Biophysics and Howard Hughes Medical Institute, The Rockefeller University, New York, NY, USA
| | - Alan John
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
| | - Runyu Mao
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
| | - Somnath Mukherjee
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA
| | - Jérémy Boilevin
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland
| | | | - Tamis Darbre
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland
| | - Nichollas E Scott
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Parkville, Victoria, Australia
| | - Jean-Louis Reymond
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland
| | - Anthony A Kossiakoff
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA
| | - Ethan D Goddard-Borger
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia.
| | - Kaspar P Locher
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland.
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2
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Meng S, Bhetuwal BR, Nguyen H, Qi X, Fang C, Saybolt K, Li X, Liu P, Zhu J. β-Mannosylation via O-Alkylation of Anomeric Cesium Alkoxides: Mechanistic Studies and Synthesis of the Hexasaccharide Core of Complex Fucosylated N-Linked Glycans. European J Org Chem 2020; 2020:2291-2301. [PMID: 32431565 PMCID: PMC7236807 DOI: 10.1002/ejoc.202000313] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Indexed: 12/11/2022]
Abstract
A number of structurally diverse D-mannose-derived lactols, including various deoxy-D-mannoses and conformationally restricted bicyclic D-mannoses, have been synthesized and investigated in mechanistic studies of β-mannosylation via Cs2CO3-mediated anomeric O-alkylation. It was found that deoxy mannoses or conformationally restricted bicyclic D-mannoses are not as reactive as their corresponding parent mannose. This type of β-mannosylation proceeds efficiently when the C2-OH is left free, and protection of that leads to inferior results. NMR studies of D-mannose-derived anomeric cesium alkoxides indicated the predominance of the equatorial β-anomer after deprotonation. Reaction progress kinetic analysis suggested that monomeric cesium alkoxides be the key reactive species for alkylation with electrophiles. DFT calculations supported that oxygen atoms at C2, C3, and C6 of mannose promote the deprotonation of the anomeric hydroxyl group by Cs2CO3 and chelating interactions between Cs and these oxygen atoms favour the formation of equatorial anomeric alkoxides, leading to the highly β-selective anomeric O-alkylation. Based on experimental data and computational results, a revised mechanism for this β-mannosylation is proposed. The utilization of this β-mannosylation was demonstrated by an efficient synthesis of the hexasaccharide core of complex fucosylated N-linked glycans.
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Affiliation(s)
- Shuai Meng
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
| | - Bishwa Raj Bhetuwal
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
| | - Hai Nguyen
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
| | - Xiaotian Qi
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Cheng Fang
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Kevin Saybolt
- Department of Natural Sciences, University of Michigan‒Dearborn, 4901 Evergreen Road, Dearborn, Michigan 48128, United States
| | - Xiaohua Li
- Department of Natural Sciences, University of Michigan‒Dearborn, 4901 Evergreen Road, Dearborn, Michigan 48128, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, 3700 O'Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
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3
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Affiliation(s)
- You Yang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Biao Yu
- State
Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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4
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Okada Y, Maruyama T, Tamura SI, Kameoka H, Masuda S, Tokuda Y, Sakai J, Nomura M. Convenient Synthesis of 1-(Trimethylsilyl)- and 1-(Trimethylstannyl)vinylphosphonates. PHOSPHORUS SULFUR 2014. [DOI: 10.1080/10426507.2013.855765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Yoshiharu Okada
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Tomohiro Maruyama
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Shin-ichi Tamura
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Hirohito Kameoka
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Satoshi Masuda
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Yuichiro Tokuda
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Junya Sakai
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
| | - Masato Nomura
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Umenobe 1, Takaya, 739-2116, Higashi-Hiroshima, Japan
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5
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Kunig J, Lönnecke P, Hey-Hawkins E. Enantiomerically pure 3-hydroxypropyl diisopropylidene mannose derivatives. Carbohydr Res 2011; 346:1154-60. [DOI: 10.1016/j.carres.2011.03.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Revised: 03/17/2011] [Accepted: 03/24/2011] [Indexed: 10/18/2022]
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6
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Sizova OV, Ross AJ, Ivanova IA, Borodkin VS, Ferguson MAJ, Nikolaev AV. Probing elongating and branching β-D-galactosyltransferase activities in Leishmania parasites by making use of synthetic phosphoglycans. ACS Chem Biol 2011; 6:648-57. [PMID: 21425873 PMCID: PMC3659391 DOI: 10.1021/cb100416j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protozoan parasites of the genus Leishmania synthesize lipophosphoglycans (LPGs), phosphoglycans and proteophosphoglycans that contain phosphosaccharide repeat units of [-6)Gal(β1-4)Man(α1-OPO(3)H-]. The repeat structures are assembled by sequential addition of Manα1-OPO(3)H and β-Gal. In this study, an UDP-Gal-dependent activity was detected in L. donovani and L. major membranes using synthetic phospho-oligosaccharide fragments of lipophosphoglycan as acceptor substrates. Incubation of a microsomal preparation from L. donovani or L. major parasites with synthetic substrates and UDP-[6-(3)H]Gal resulted in incorporation of radiolabel into these exogenous acceptors. The [(3)H]galactose-labeled products were characterized by degradation into radioactive, low molecular mass fragments upon hydrolysis with mild acid and treatment with β-galactosidases. We showed that the activity detected with L. donovani membranes is the elongating β-d-galactosyltransferase associated with LPG phosphosaccharide backbone biosynthesis (eGalT). The eGalT activity showed a requirement for the presence of at least one phosphodiester group in the substrate and it was enhanced dramatically when two or three phosphodiester groups were present. Using the same substrates we detected two types of galactosyltransferase activity in L. major membranes: the elongating β-d-galactosyltransferase and a branching β-d-galactosyltransferase (bGalT). Both L. major enzymes required a minimum of one phosphodiester group present in the substrate, but acceptors with two or three phosphodiester groups were found to be superior.
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Affiliation(s)
- Olga V. Sizova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Andrew J. Ross
- College of Life Sciences, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K
| | - Irina A. Ivanova
- College of Life Sciences, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K
| | - Vladimir S. Borodkin
- College of Life Sciences, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K
| | - Michael A. J. Ferguson
- College of Life Sciences, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K
| | - Andrei V. Nikolaev
- College of Life Sciences, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K
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Choumane M, Banchet A, Probst N, Gérard S, Plé K, Haudrechy A. The synthesis of d-C-mannopyranosides. CR CHIM 2011. [DOI: 10.1016/j.crci.2010.05.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Chandra S, Ruhela D, Deb A, Vishwakarma RA. Glycobiology of theLeishmaniaparasite and emerging targets for antileishmanial drug discovery. Expert Opin Ther Targets 2010; 14:739-57. [DOI: 10.1517/14728222.2010.495125] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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9
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Grison C, Chibli H. Concise Synthesis ofP-Glycosyl Alkenylphosphonates andP,C-di andP,P,Ctri-Glycosyl Phosphonates. J Carbohydr Chem 2009. [DOI: 10.1080/07328300802638472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Heissigerová H, Kočalka P, Hlaváčková M, Imberty A, Breton C, Chazalet V, Moravcová J. Synthesis of D-Galactopyranosylphosphonic and (D-Galactopyranosylmethyl)phosphonic Acids as Intermediates of Inhibitors of Galactosyltransferases. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20061659] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Employing the Michaelis-Arbuzov reaction of 1-O-acetyl-2,3,4,6-tetra-O-benzyl-D-galactopyranose with triethyl phosphite and trimethylsilyl trifluoromethanesulfonate, α- and β-D-galactopyranosylphosphonic acids were prepared in 33 and 28% yields, respectively. (α-D-Galactopyranosylmethyl)phosphonic acid was synthesized by a five-step route from 2,3,4,6-tetra-O-benzyl-D-galactopyranose in 52% overall yield. When tested against bovine α-1,3- and β-1,4-galactosyltransferases, all three compounds showed, at best, very poor inhibitions. Both enzymes were inhibited more effectively by β-D-galactopyranosylphosphonic acid (IC50 = 17 mmol l-1 at 13.5 μmol l-1 of UDP-Gal for β4GalT).
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11
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Ruhela D, Chatterjee P, Vishwakarma RA. 1-Oxabicyclic β-lactams as new inhibitors of elongating MPT–a key enzyme responsible for assembly of cell-surface phosphoglycans of Leishmania parasite. Org Biomol Chem 2005; 3:1043-8. [PMID: 15750647 DOI: 10.1039/b418247b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New iminosugars (1-oxabicyclic beta-lactam disaccharides) have been synthesized as inhibitors of elongating alpha-D-mannosyl phosphate transferase (eMPT), a key enzyme involved in the iterative biosynthesis of cell-surface phosphoglycans of the Leishmania parasite. The design is based on a transition-state model for this remarkable enzyme that transfers intact alpha-D-mannosyl-phosphate from GDP-Man. Since these phosphoglycans are unique to Leishmania and are essential for its infectivity and survival, their biosynthetic pathway has emerged as a novel target for anti-leishmanial drug and vaccine design.
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Affiliation(s)
- Dipali Ruhela
- Bio-organic Chemistry Lab, National Institute of Immunology, JNU Complex, New Delhi 110-067, India
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12
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Synthesis of potential bisubstrate inhibitors of Leishmania elongating α-d-mannosyl phosphate transferase. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2003.11.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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