1
|
Njeri DK, Ragains JR. Total Synthesis of a Pentasaccharide O-Glycan from Acinetobacter baumannii. European J Org Chem 2022; 2022:e202201261. [PMID: 36876192 PMCID: PMC9983622 DOI: 10.1002/ejoc.202201261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Indexed: 12/23/2022]
Abstract
Acinetobacter baumannii is a Gram-negative bacteria associated with drug resistance and infection in healthcare settings. An understanding of both the biological roles and antigenicity of surface molecules of this organism may provide an important step in the prevention and treatment of infection through vaccination or the development of monoclonal antibodies. With this in mind, we have performed the multistep synthesis of a conjugation-ready pentasaccharide O-glycan from A. baumannii with a longest linear synthetic sequence of 19 steps. This target is particularly relevant due to its role in both fitness and virulence across an apparently broad range of clinically relevant strains. Synthetic challenges include formulating an effective protecting group scheme as well as the installation of a particularly difficult glycosidic linkage between the anomeric position of a 2,3-diacetamido-2,3-dideoxy-D-glucuronic acid and the 4-position of D-galactose.
Collapse
Affiliation(s)
- Dancan K Njeri
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803
| | - Justin R Ragains
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803
| |
Collapse
|
2
|
Karak M, Haldar A, Torikai K. Current Tools for Chemical Glycosylation: Where Are We Now? TRENDS GLYCOSCI GLYC 2021. [DOI: 10.4052/tigg.2014.7e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
| | | | - Kohei Torikai
- Faculty of Chemistry, National University of Uzbekistan named after Mirzo Ulugbek
| |
Collapse
|
3
|
Karak M, Haldar A, Torikai K. Current Tools for Chemical Glycosylation: Where Are We Now? TRENDS GLYCOSCI GLYC 2021. [DOI: 10.4052/tigg.2014.7j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
| | | | - Kohei Torikai
- Department of Chemistry, Faculty of Science, Kyushu University
| |
Collapse
|
4
|
Yano K, Sasaki N, Itoh T, Nokami T. Synthesis of Oligosaccharides of Glucosamine by Automated Electrochemical Assembly. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | - Toshiki Nokami
- Department of Chemistry and Biotechnology, Tottori University
| |
Collapse
|
5
|
Shibuya A, Nokami T. Electrochemical Assembly for Synthesis of Middle-Sized Organic Molecules. CHEM REC 2021; 21:2389-2396. [PMID: 34101967 DOI: 10.1002/tcr.202100085] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/21/2021] [Indexed: 12/23/2022]
Abstract
Electrochemical methods offer a powerful, reliable, and environmentally benign approach for the synthesis of small organic molecules, and such methods are useful not only for the transformation of small molecules, but also for the preparation of oligomers and polymers. Electrochemical assembly is a concept that allows structurally well-defined middle-sized organic molecules to be synthesized by applying electrochemical methods. The preparation of dendrimers, dendronized polymers, and oligosaccharides are introduced as examples of such an approach. Automated electrochemical assembly of oligosaccharides is also demonstrated using the electrochemical synthesizer developed by our group.
Collapse
Affiliation(s)
- Akito Shibuya
- Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyamacho-minami, Tottori city, 680-8552 Tottori, Japan
| | - Toshiki Nokami
- Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyamacho-minami, Tottori city, 680-8552 Tottori, Japan.,Center for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, 4-101 Koyamacho-minami, Tottori city, 680-8552 Tottori, Japan
| |
Collapse
|
6
|
Morimoto Y, Takahashi S, Isoda Y, Nokami T, Fukamizo T, Suginta W, Ohnuma T. Kinetic and thermodynamic insights into the inhibitory mechanism of TMG-chitotriomycin on Vibrio campbellii GH20 exo-β-N-acetylglucosaminidase. Carbohydr Res 2020; 499:108201. [PMID: 33243428 DOI: 10.1016/j.carres.2020.108201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/10/2020] [Accepted: 11/11/2020] [Indexed: 12/20/2022]
Abstract
We investigated the inhibition kinetics of VhGlcNAcase, a GH20 exo-β-N-acetylglucosaminidase (GlcNAcase) from the marine bacterium Vibrio campbellii (formerly V. harveyi) ATCC BAA-1116, using TMG-chitotriomycin, a natural enzyme inhibitor specific for GH20 GlcNAcases from chitin-processing organisms, with p-nitrophenyl N-acetyl-β-d-glucosaminide (pNP-GlcNAc) as the substrate. TMG-chitotriomycin inhibited VhGlcNAcase with an IC50 of 3.0 ± 0.7 μM. Using Dixon plots, the inhibition kinetics indicated that TMG-chitotriomycin is a competitive inhibitor, with an inhibition constant Ki of 2.2 ± 0.3 μM. Isothermal titration calorimetry experiments provided the thermodynamic parameters for the binding of TMG-chitotriomycin to VhGlcNAcase and revealed that binding was driven by both favorable enthalpy and entropy changes (ΔH° = -2.5 ± 0.1 kcal/mol and -TΔS° = -5.8 ± 0.3 kcal/mol), resulting in a free energy change, ΔG°, of -8.2 ± 0.2 kcal/mol. Dissection of the entropic term showed that a favorable solvation entropy change (-TΔSsolv° = -16 ± 2 kcal/mol) is the main contributor to the entropic term.
Collapse
Affiliation(s)
- Yusuke Morimoto
- Department of Advanced Bioscience, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Shuji Takahashi
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyama-minami, Tottori, 680-8552, Japan
| | - Yuta Isoda
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyama-minami, Tottori, 680-8552, Japan
| | - Toshiki Nokami
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyama-minami, Tottori, 680-8552, Japan
| | - Tamo Fukamizo
- Department of Advanced Bioscience, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan; School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Tumbol Payupnai, Wangchan Valley, Rayong, 21210, Thailand
| | - Wipa Suginta
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Tumbol Payupnai, Wangchan Valley, Rayong, 21210, Thailand
| | - Takayuki Ohnuma
- Department of Advanced Bioscience, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan; Agricultural Technology and Innovation Research Institute, Kindai University, Nara, Japan.
| |
Collapse
|
7
|
Yano K, Itoh T, Nokami T. Total synthesis of Myc-IV(C16:0, S) via automated electrochemical assembly. Carbohydr Res 2020; 492:108018. [PMID: 32339812 DOI: 10.1016/j.carres.2020.108018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/16/2020] [Accepted: 04/16/2020] [Indexed: 02/06/2023]
Abstract
Total synthesis of Myc-IV(C16:0, S) via automated electrochemical assembly has been accomplished. This tetrasaccharide has been studied as a symbiotic signal molecule of Arbuscular Mycorrhiza fungi. We have achieved stereoselective synthesis of a disaccharide building block using the mixed-electrolyte system for electrochemical glycosylation; 2 + 1+1 strategy enables us to access the tetrasaccharide precursor and complete the synthesis Myc-IV(C16:0, S) efficiently.
Collapse
Affiliation(s)
- Kumpei Yano
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyamacho-minami, Tottori City, 680-8552, Tottori, Japan
| | - Toshiyuki Itoh
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyamacho-minami, Tottori City, 680-8552, Tottori, Japan; Center for Research on Green Sustainable Chemistry, Tottori University, 4-101 Koyamacho-minami, Tottori City, 680-8552, Tottori, Japan
| | - Toshiki Nokami
- Department of Chemistry and Biotechnology, Tottori University, 4-101 Koyamacho-minami, Tottori City, 680-8552, Tottori, Japan; Center for Research on Green Sustainable Chemistry, Tottori University, 4-101 Koyamacho-minami, Tottori City, 680-8552, Tottori, Japan.
| |
Collapse
|
8
|
Njeri DK, Pertuit CJ, Ragains JR. 1,2-cis-Selective glucosylation enabled by halogenated benzyl protecting groups. Org Biomol Chem 2020; 18:2405-2409. [PMID: 32195525 DOI: 10.1039/d0ob00373e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on our initial results from a systematic effort to implement electron-withdrawing protecting groups and Lewis basic solvents/additives as an approach to 1,2-cis(α)-selective O-glucosylation. 1,2-cis-Selective O-glucosylations are reported with thioglucosides and glucosyl trichloroacetimidates and a range of acceptors. A correlation between electron-withdrawing effects and 1,2-cis selectivity has been established. This phenomenon may prove to be broadly applicable in the area of chemical O-glycosylation.
Collapse
Affiliation(s)
- Dancan K Njeri
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803, USA
| | - Claude J Pertuit
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803, USA
| | - Justin R Ragains
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803, USA
| |
Collapse
|
9
|
Manmode S, Tanabe S, Yamamoto T, Sasaki N, Nokami T, Itoh T. Electrochemical Glycosylation as an Enabling Tool for the Stereoselective Synthesis of Cyclic Oligosaccharides. ChemistryOpen 2019; 8:869-872. [PMID: 31309034 PMCID: PMC6607414 DOI: 10.1002/open.201900185] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Indexed: 11/08/2022] Open
Abstract
Electrochemical glycosylation of a linear oligosaccharide with a protecting-group-free primary hydroxyl group afforded cyclic oligo-saccharides, up to hexasaccharides, in high yields. Precursors of the cyclic oligosaccharides were prepared by automated electro-chemical assembly-a method for the automated electrochemical solution-phase synthesis of oligosaccharides. We demonstrated that electrochemical glycosylation is useful not only for intermolecular glycosylation but also for intramolecular glycosylation to synthesize cyclic oligosaccharides.
Collapse
Affiliation(s)
- Sujit Manmode
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai
| | - Shichidai Tanabe
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai
| | - Takashi Yamamoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai
| | - Norihiko Sasaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai
| | - Toshiki Nokami
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai.,Center for Research on Green Sustainable Chemistry, Faculty of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan
| | - Toshiyuki Itoh
- Department of Chemistry and Biotechnology, Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan E-mai.,Center for Research on Green Sustainable Chemistry, Faculty of Engineering Tottori University 4-101 Koyamachominami Tottori city 680-8552 Tottori Japan
| |
Collapse
|