1
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Shibuya A, Ishisaka Y, Saito A, Kato M, Manmode S, Komatsu H, Rahman MA, Sasaki N, Itoh T, Nokami T. Electrochemical synthesis of the protected cyclic (1,3;1,6)-β-glucan dodecasaccharide. Faraday Discuss 2023; 247:59-69. [PMID: 37466008 DOI: 10.1039/d3fd00045a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Automated electrochemical assembly is an electrochemical method to synthesise middle-sized molecules, including linear oligosaccharides, and some linear oligosaccharides can be electrochemically converted into the corresponding cyclic oligosaccharides effectively. In this study, the target cyclic oligosaccharide is a protected cyclic (1,3;1,6)-β-glucan dodecasaccharide, which consists of two types of glucose trisaccharides with β-(1,3)- and β-(1,6)-glycosidic linkages. The formation of the protected cyclic dodecasaccharide was confirmed by the electrochemical one-pot dimerisation-cyclisation of the semi-circular hexasaccharide. The yield of the protected cyclic dodecasaccharide was improved by using a stepwise synthesis via the linear dodecasaccharide.
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Affiliation(s)
- Akito Shibuya
- Graduate School of Engineering, Tottori University, Japan.
| | - Yui Ishisaka
- Graduate School of Sustainable Science, Tottori University, Japan
| | - Asuka Saito
- Graduate School of Sustainable Science, Tottori University, Japan
| | - Moeko Kato
- Graduate School of Sustainable Science, Tottori University, Japan
| | - Sujit Manmode
- Graduate School of Engineering, Tottori University, Japan.
| | - Hiroto Komatsu
- Department of Chemistry and Biotechnology, Faculty of Engineering, Tottori University, Japan
| | | | - Norihiko Sasaki
- Graduate School of Engineering, Tottori University, Japan.
- Centre for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Japan
| | - Toshiyuki Itoh
- Graduate School of Engineering, Tottori University, Japan.
- Centre for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Japan
| | - Toshiki Nokami
- Graduate School of Engineering, Tottori University, Japan.
- Centre for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Japan
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2
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Li X, Di Carluccio C, Miao H, Zhang L, Shang J, Molinaro A, Xu P, Silipo A, Yu B, Yang Y. Promoter-Controlled Synthesis and Conformational Analysis of Cyclic Mannosides up to a 32-mer. Angew Chem Int Ed Engl 2023; 62:e202307851. [PMID: 37433753 DOI: 10.1002/anie.202307851] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 07/10/2023] [Accepted: 07/11/2023] [Indexed: 07/13/2023]
Abstract
Cyclodextrins are widely used as carriers of small molecules for drug delivery owing to their remarkable host properties and excellent biocompatibility. However, cyclic oligosaccharides with different sizes and shapes are limited. Cycloglycosylation of ultra-large bifunctional saccharide precursors is challenging due to the constrained conformational spaces. Herein we report a promoter-controlled cycloglycosylation approach for the synthesis of cyclic α-(1→6)-linked mannosides up to a 32-mer. Cycloglycosylation of the bifunctional thioglycosides and (Z)-ynenoates was found to be highly dependent on the promoters. In particular, a sufficient amount of a gold(I) complex played a key role in the proper preorganization of the ultra-large cyclic transition state, providing a cyclic 32-mer polymannoside, which represents the largest synthetic cyclic polysaccharide to date. NMR experiments and a computational study revealed that the cyclic 2-mer, 4-mer, 8-mer, 16-mer, and 32-mer mannosides adopted different conformational states and shapes.
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Affiliation(s)
- Xiaona Li
- Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Cristina Di Carluccio
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, 80126, Napoli, Italy
| | - He Miao
- Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Lvfeng Zhang
- Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Jintao Shang
- Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Antonio Molinaro
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, 80126, Napoli, Italy
- Department of Chemistry, School of Science, Osaka University, 1-1 Osaka University Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Peng Xu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Alba Silipo
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, 80126, Napoli, Italy
- Department of Chemistry, School of Science, Osaka University, 1-1 Osaka University Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Biao Yu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - You Yang
- Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
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3
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Towards one-pot selective synthesis of cyclic oligosaccharides. Adv Carbohydr Chem Biochem 2022; 82:1-10. [PMID: 36470646 DOI: 10.1016/bs.accb.2022.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this chapter are described electrochemical routes to cyclic oligosaccharides. While automated electrochemical methods have been used to prepare linear oligosaccharides, their conversion to cyclic oligosaccharides proved to be a complex process. The concept of polyglycosylation offers an interesting alternative, and the process which has been developed is that of a one-pot electrochemical polyglycosylation-isomerization-cyclization (ePIC) process.
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4
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Yudina ON, Gening ML, Talukdar P, Gerbst AG, Tsvetkov YE, Nifantiev NE. Synthesis of a cyclic tetramer of 3-amino-3-deoxyallose with axially oriented amino groups. Carbohydr Res 2021; 511:108476. [PMID: 34800752 DOI: 10.1016/j.carres.2021.108476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 12/01/2022]
Abstract
A linear tetramer of β-(1 → 6)-linked 3-azido-3-deoxy-d-allose containing glycosyl donor and glycosyl acceptor functions in the terminal monosaccharide units was prepared starting from 3-azido-3-deoxy-1,2:5,6-di-O-isopropylidene-α-d-allofuranose. Cyclization of the linear tetramer under glycosylation conditions afforded the corresponding cyclic tetrasaccharide in 77% yield; its deprotection and reduction of the azido groups resulted in the formation of the cyclic tetramer of 3-amino-3-deoxy-d-allose with axial amino groups, a potential scaffold for the synthesis of tetravalent functional clusters.
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Affiliation(s)
- Olga N Yudina
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp, 119991, Moscow, Russian Federation
| | - Marina L Gening
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp, 119991, Moscow, Russian Federation
| | - Pinaki Talukdar
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India
| | - Alexey G Gerbst
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp, 119991, Moscow, Russian Federation
| | - Yury E Tsvetkov
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp, 119991, Moscow, Russian Federation
| | - Nikolay E Nifantiev
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp, 119991, Moscow, Russian Federation.
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5
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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
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6
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Tandem Electrospray Mass Spectrometry of Cyclic N-Substituted Oligo-β-(1→6)-D-glucosamines. Int J Mol Sci 2020; 21:ijms21218284. [PMID: 33167433 PMCID: PMC7663939 DOI: 10.3390/ijms21218284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/01/2020] [Accepted: 11/02/2020] [Indexed: 12/03/2022] Open
Abstract
High-resolution electrospray mass spectra (MS and MS/MS CID) of positive ions of a series of protonated, ammoniated, and metallated molecules of cyclic N-substituted oligo-β-(1→6)-D-glucosamines differing in cycle size and N-acyl substituents were registered and interpreted. It was shown that the main type of fragmentation is a cleavage of glycosidic bonds of a cycle, and in some cases fragmentation of amide side chains is possible. If labile fragments in substituents (e.g., carbohydrate chains) are present, a decay of the cycle and an elimination of labile fragments are of comparable possibility. It was found that in some cases rearrangements with loss of an internal carbohydrate residue (IRL), or an internal part of a side chain, are feasible.
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7
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Abronina PI, Zinin AI, Chizhov AO, Kononov LO. Unusual Outcome of Glycosylation: Hydrogen‐Bond Mediated Control of Stereoselectivity by
N
‐Trifluoroacetyl Group? European J Org Chem 2020. [DOI: 10.1002/ejoc.202000520] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Polina I. Abronina
- N.K. Kochetkov Laboratory of Carbohydrate Chemistry N.D. Zelinsky Institute of Organic Chemistry Leninsky prosp. 47 119991 Moscow Russian Federation
| | - Alexander I. Zinin
- N.K. Kochetkov Laboratory of Carbohydrate Chemistry N.D. Zelinsky Institute of Organic Chemistry Leninsky prosp. 47 119991 Moscow Russian Federation
| | - Alexander O. Chizhov
- N.K. Kochetkov Laboratory of Carbohydrate Chemistry N.D. Zelinsky Institute of Organic Chemistry Leninsky prosp. 47 119991 Moscow Russian Federation
| | - Leonid O. Kononov
- N.K. Kochetkov Laboratory of Carbohydrate Chemistry N.D. Zelinsky Institute of Organic Chemistry Leninsky prosp. 47 119991 Moscow Russian Federation
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8
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Someya H, Seki T, Ishigami G, Itoh T, Saga Y, Yamada Y, Aoki S. One-pot synthesis of cyclic oligosaccharides by the polyglycosylation of monothioglycosides. Carbohydr Res 2020; 487:107888. [DOI: 10.1016/j.carres.2019.107888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 11/29/2019] [Accepted: 12/03/2019] [Indexed: 10/25/2022]
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9
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Chizhov AO, Gening ML, Pinsker OA, Tsvetkov YE, Nifantiev NE. Isomeric Effects in Collisionally-induced Dissociation of β-(1→6)-linked Cyclic Tetrasaccharides of the Glcp2GlcpN2 Composition. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s1061934819130057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Forman A, Pfoh R, Eddenden A, Howell PL, Nitz M. Synthesis of defined mono-de-N-acetylated β-(1→6)-N-acetyl-d-glucosamine oligosaccharides to characterize PgaB hydrolase activity. Org Biomol Chem 2019; 17:9456-9466. [PMID: 31642455 DOI: 10.1039/c9ob02079a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many clinically-relevant biofilm-forming bacterial strains produce partially de-N-acetylated poly-β-(1→6)-N-acetyl-d-glucosamine (dPNAG) as an exopolysaccharide. In Gram-negative bacteria, the periplasmic protein PgaB is responsible for partial de-N-acetylation of PNAG prior to its export to the extracellular space. In addition to de-N-acetylase activity found in the N-terminal domain, PgaB contains a C-terminal hydrolase domain that can disrupt dPNAG-dependent biofilms and hydrolyzes dPNAG but not fully acetylated PNAG. The role of this C-terminal domain in biofilm formation has yet to be determined in vivo. Further characterization of the enzyme's hydrolase activity has been hampered by a lack of specific dPNAG oligosaccharides. Here, we report the synthesis of a defined mono de-N-acetylated dPNAG penta- and hepta-saccharide. Using mass spectrometry analysis and a fluorescence-based thin-layer chromatography (TLC) assay, we found that our defined dPNAG oligosaccharides are hydrolase substrates. In addition to the expected cleavage site, two residues to the reducing side of the de-N-acetylated residue, minor cleavage products on the non-reducing side of the de-N-acetylation site were observed. These findings provide quantitative data to support how PNAG is processed in Gram-negative bacteria.
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Affiliation(s)
- Adam Forman
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 3H6.
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11
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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.
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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
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12
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Gas-phase fragmentation studies of cyclic oligo-β-(1→6)-D-glucosamines by electrospray ionization mass spectrometry using a hybrid high-resolution mass spectrometer. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2050-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Roy A, Saha T, Gening ML, Titov DV, Gerbst AG, Tsvetkov YE, Nifantiev NE, Talukdar P. Trimodal Control of Ion-Transport Activity on Cyclo-oligo-(1→6)-β-D-glucosamine-Based Artificial Ion-Transport Systems. Chemistry 2015; 21:17445-52. [PMID: 26448281 DOI: 10.1002/chem.201502656] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Indexed: 11/05/2022]
Abstract
Cyclo-oligo-(1→6)-β-D-glucosamines functionalized with hydrophobic tails are reported as a new class of transmembrane ion-transport system. These macrocycles with hydrophilic cavities were introduced as an alternative to cyclodextrins, which are supramolecular systems with hydrophobic cavities. The transport activities of these glycoconjugates were manipulated by altering the oligomericity of the macrocycles, as well as the length and number of attached tails. Hydrophobic tails of 3 different sizes were synthesized and coupled with each glucosamine scaffold through the amide linkage to obtain 18 derivatives. The ion-transport activity increased from di- to tetrameric glucosamine macrocycles, but decreased further when flexible pentameric glucosamine was introduced. The ion-transport activity also increased with increasing length of attached linkers. For a fixed length of linkers, the transport activity decreased when the number of such tails was reduced. All glycoconjugates displayed a uniform anion-selectivity sequence: Cl(-) >Br(-) >I(-) . From theoretical studies, hydrogen bonding between the macrocycle backbone and the anion bridged through water molecules was observed.
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Affiliation(s)
- Arundhati Roy
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra (India), Fax: (+91) 20-25899790
| | - Tanmoy Saha
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra (India), Fax: (+91) 20-25899790
| | - Marina L Gening
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7) 499-1358784
| | - Denis V Titov
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7) 499-1358784
| | - Alexey G Gerbst
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7) 499-1358784
| | - Yury E Tsvetkov
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7) 499-1358784
| | - Nikolay E Nifantiev
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7) 499-1358784.
| | - Pinaki Talukdar
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra (India), Fax: (+91) 20-25899790.
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14
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Guo T, Wu S, Guo S, Bai L, Liu Q, Bai N. Synthesis and Evaluation of a Series of Oleanolic Acid Saponins as α-Glucosidase and α-Amylase Inhibitors. Arch Pharm (Weinheim) 2015. [PMID: 26207761 DOI: 10.1002/ardp.201500179] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Sixteen naturally occurring oleanolic acid saponins and their derivatives were synthesized in an efficient and practical strategy, and their inhibitory activities against α-glucosidase and α-amylase were evaluated in vitro. Among all the compounds, 28-O-monoglucoside 8 exhibited remarkably potent inhibitory activity against α-glucosidase with an IC50 value of 87.3 µM, which was fivefold stronger than that of the antidiabetic acarbose. Based on the preliminary structure-activity relationships, for 28-O-monoglucosides, the presence of a terminal α-l-rhamnopyranosyl residue enhanced the α-glucosidase and α-amylase inhibitory activities. Furthermore, for 3,28-O-bidesmosides, sugar-substituted moieties attached to the C-3 and C-28 positions of the oleanolic acid scaffold are helpful to increase the inhibitory activities against α-amylase and α-glucosidase.
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Affiliation(s)
- Tiantian Guo
- Department of Pharmaceutical Engineering, Northwest University, Xi'an, Shaanxi, P. R. China
| | - Shaoping Wu
- Sorbonne Universités, UPMC University, Paris, France
| | - Sen Guo
- Department of Pharmaceutical Engineering, Northwest University, Xi'an, Shaanxi, P. R. China
| | - Lu Bai
- Department of Pharmaceutical Engineering, Northwest University, Xi'an, Shaanxi, P. R. China
| | - Qingchao Liu
- Department of Pharmaceutical Engineering, Northwest University, Xi'an, Shaanxi, P. R. China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, Hong Kong, P. R. China
| | - Naisheng Bai
- Department of Pharmaceutical Engineering, Northwest University, Xi'an, Shaanxi, P. R. China
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15
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Christensen HM, Oscarson S, Jensen HH. Common side reactions of the glycosyl donor in chemical glycosylation. Carbohydr Res 2015; 408:51-95. [DOI: 10.1016/j.carres.2015.02.007] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 02/12/2015] [Accepted: 02/18/2015] [Indexed: 12/13/2022]
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16
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Liu H, Li X. Synthesis of cyclogentiotriose by macrocyclization via a ring-closing glycosylation. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Tena-Solsona M, Angulo-Pachón CA, Escuder B, Miravet JF. Mechanistic Insight into the Lability of the Benzyloxycarbonyl (Z) Group in N-Protected Peptides under Mild Basic Conditions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Saha T, Roy A, Gening ML, Titov DV, Gerbst AG, Tsvetkov YE, Nifantiev NE, Talukdar P. Cyclo-oligo-(1 → 6)-β-d-glucosamine based artificial channels for tunable transmembrane ion transport. Chem Commun (Camb) 2014; 50:5514-6. [DOI: 10.1039/c3cc49490j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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19
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Gening ML, Tsvetkov YE, Titov DV, Gerbst AG, Yudina ON, Grachev AA, Shashkov AS, Vidal S, Imberty A, Saha T, Kand D, Talukdar P, Pier GB, Nifantiev NE. Linear and cyclic oligo-β-(1→6)-D-glucosamines: Synthesis, conformations, and applications for design of a vaccine and oligodentate glycoconjugates. PURE APPL CHEM 2013. [DOI: 10.1351/pac-con-12-09-06] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Poly-β-(1→6)-N-acetyl-D-glucosamine is an exopolysaccharide secreted by numerous pathogenic bacteria, includingStaphylococcus aureus,Escherichia coli,Yersinia pestis,Bordetella pertussis,Acinetobacter baumannii,Burkholderiaspp., and others. A convergent approach was developed for the synthesis of oligosaccharide fragments consisting of 5, 7, 9, and 11 glucosamine orN-acetylglucosamine units and for the preparation of five nona-β-(1→6)-D-glucosamines with variousN-acetylation patterns. Penta- and nona-β‑(1→6)-D-glucosamines conjugated to protein carriers through a specially developed sulfhydryl linker proved to be highly immunogenic in mice and rabbits and elicited antibodies that mediated opsonic killing of multiple strains ofS. aureus(including methicillin-resistantS. aureus, MRSA) andE. coli, and protected againstS. aureusskin abscesses and lethalE. coliandB. cenocepaciaperitonitis. These findings provide a basis for the construction of a unique semisynthetic vaccine against multiple bacterial targets. Conformational studies by means of special NMR experiments and computer modeling revealed that the oligo-β-(1→6)-D-glucosamine chain exists mostly in a helix-like conformation, where the terminal monosaccharides are arranged close to each other. Owing to this feature, oligoglucosamines consisting of 2 to 7 residues easily form products of cycloglycosylation. Cyclooligo-β-(1→6)-D-glucosamines represent a new family of functionalized cyclic oligosaccharides. Owing to their molecular architectonics, these compounds are convenient scaffolds for the design of conjugates with defined valency, symmetry, flexibility, and function.
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