1
|
Homayonia S, Ling CC. Epoxide-Mediated Trans-Thioglycosylation and Application to the Synthesis of Oligosaccharides Related to the Capsular Polysaccharides of C. jejuni HS:4. Chemistry 2024; 30:e202303753. [PMID: 38215247 DOI: 10.1002/chem.202303753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 01/10/2024] [Accepted: 01/10/2024] [Indexed: 01/14/2024]
Abstract
The enzyme-resistant thioglycosides are highly valuable immunogens because of their enhanced metabolic stability. We report the first synthesis of a family of thiooligosaccharides related to the capsular polysaccharides (CPS) of Campylobacter jejuni HS:4 for potential use in conjugate vaccines. The native CPS structures of the pathogen consist of a challenging repeating disaccharide formed with β(1→4)-linked 6-deoxy-β-D-ido-heptopyranoside and N-acetyl-D-glucosamine; the rare 6-deoxy-ido-heptopyranosyl backbone and β-anomeric configuration of the former monosaccharide makes the synthesis of this family of antigens very challenging. So far, no synthesis of the thioanalogs of the CPS antigens have been reported. The unprecedented synthesis presented in this work is built on an elegant approach by using β-glycosylthiolate as a glycosyl donor to open the 2,3-epoxide functionality of pre-designed 6-deoxy-β-D-talo-heptopyranosides. Our results illustrated that this key trans-thioglycosylation can be designed in a modular and regio and stereo-selective manner. Built on the success of this novel approach, we succeeded the synthesis of a family of thiooligosaccharides including a thiohexasaccharide which is considered to be the desired antigen length and complexity for immunizations. We also report the first direct conversion of base-stable but acid-labile 2-trimethylsilylethyl glycosides to glycosyl-1-thioacetates in a one-pot manner.
Collapse
Affiliation(s)
- Saba Homayonia
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| | - Chang-Chun Ling
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| |
Collapse
|
2
|
Thota VN, Lowary TL. Synthesis of 6-deoxy-d-ido-heptopyranose-containing fragments of the Campylobacter jejuni strain CG8486 capsular polysaccharide. Carbohydr Res 2024; 536:109058. [PMID: 38354653 DOI: 10.1016/j.carres.2024.109058] [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: 01/13/2024] [Revised: 02/05/2024] [Accepted: 02/08/2024] [Indexed: 02/16/2024]
Abstract
Campylobacters are important causes of gastrointestinal illness and the capsular polysaccharides (CPS) they produce are key virulence factors and targets for vaccine development. We report here the synthesis of two fragments of the Campylobacter jejuni CG8486 strain CPS that contain a rare 6-deoxy-d-ido-heptopyranose residue and, in one target, two O-methyl phosphoramidate (MeOPN) motifs. The synthetic approach features the stereoselective construction of the β-d-ido-heptopyranoside linkage via glycosylation with a β-d-galacto-heptopyranoside donor followed by a one-pot sequential C-2 and C-3 inversion. During the syntheses, we uncovered a number of interesting conformational effects with regard to the 6-deoxy-ido-heptopyranose ring, the glycosidic linkage connecting the two monosaccharides, and the MeOPN groups.
Collapse
Affiliation(s)
- V Narasimharao Thota
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Todd L Lowary
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada; Institute of Biological Chemistry, Academia Sinica, Academia Road, Section 2, #128, Nangang, Taipei, 11529, Taiwan; Institute of Biochemical Sciences, National Taiwan University, Section 4, #1, Roosevelt Road, Taipei, 10617, Taiwan.
| |
Collapse
|
3
|
Dorst KM, Widmalm G. NMR chemical shift prediction and structural elucidation of linker-containing oligo- and polysaccharides using the computer program CASPER. Carbohydr Res 2023; 533:108937. [PMID: 37734222 DOI: 10.1016/j.carres.2023.108937] [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: 08/02/2023] [Revised: 09/01/2023] [Accepted: 09/01/2023] [Indexed: 09/23/2023]
Abstract
Carbohydrate structures containing alkyl groups as aglycones are useful for investigating enzyme activity and glycan-protein interactions. Moreover, linker-containing oligosaccharides with a spacer group are commonly used to print glycan microarrays or to prepare protein-conjugates as vaccine candidates. The structural accuracy of these synthesized glycans are essential for interpretation of results from biological experiments in which the compounds have been used and NMR spectroscopy can unravel and confirm their structures. An approach for efficient 1H and 13C NMR chemical shift assignments employed a parallel NOAH-10 measurement followed by NMR spin-simulation to refine the 1H NMR chemical shifts, as exemplified for a disaccharide with an azidoethyl group as an aglycone, the NMR chemical shifts of which have been used to enhance the quality of CASPER (http://www.casper.organ.su.se/casper/). The CASPER program has been further developed to aid characterization of linker-containing oligo- and polysaccharides, either by chemical shift prediction for comparison to experimental NMR data or as structural investigation of synthesized glycans based on acquired unassigned NMR data. The ability of CASPER to elucidate structures of linker-containing oligosaccharides is demonstrated and comparisons to assigned or unassigned NMR data show the utility of CASPER in supporting a proposed oligosaccharide structure. Prediction of NMR chemical shifts of an oligosaccharide, corresponding to the repeating unit of an O-antigen polysaccharide, having a linker as an aglycone and a non-natural substituent derivative thereof are presented to exemplify the diversity of structures handled. Furthermore, NMR chemical shift predictions of synthesized polysaccharides, corresponding to bacterial polysaccharides, containing a linker are described showing that in addition to oligosaccharide structures also polysaccharide structures having an aglycone spacer group can be analyzed by CASPER.
Collapse
Affiliation(s)
- Kevin M Dorst
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Göran Widmalm
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden.
| |
Collapse
|
4
|
Sun Y, Qiao Z, Li D, Ni J, Wang J, Wang P, Song N, Li M. Access to 6-Deoxy-heptose Constructs by One Carbon Homologation of Hexoses with Malononitrile: Divergent Synthesis of Campylobacter jejuni Strain 81-176 Capsular Trisaccharide Repeating Unit Derivatives. Org Lett 2022; 24:7944-7949. [DOI: 10.1021/acs.orglett.2c03075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yao Sun
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Zhi Qiao
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Dongwei Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Jingxuan Ni
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Jianjun Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Peng Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Ni Song
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Ming Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| |
Collapse
|
5
|
Cloutier M, Lavoie S, Gauthier C. C7 Epimerization of Benzylidene-Protected β-d-Idopyranosides Brings Structural Insights into Idose Conformational Flexibility. J Org Chem 2022; 87:12932-12953. [PMID: 36137237 DOI: 10.1021/acs.joc.2c01504] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Idose is unique among other aldohexoses because of its high conformational flexibility in solution. We herein show that benzylidene acetal-protected 3-O-acyl-β-d-idopyranosides undergo Lewis acid-catalyzed C7 epimerization with concomitant 4C1 to 1C4 ring inversion. The reaction conditions and structural parameters for this transformation to occur have been thoroughly investigated through an extensive glycosylation study combined with NMR analyses, X-ray diffraction, and quantum molecular modeling. In addition to reporting a direct, β-stereoselective idosylation approach, our work brings fundamental structural insights into the conformational flexibility of idose.
Collapse
Affiliation(s)
- Maude Cloutier
- Unité Mixte de Recherche INRS-UQAC, Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 555, boulevard de l'Université, Chicoutimi, Québec, Canada G7H 2B1
| | - Serge Lavoie
- Laboratoire LASEVE, Département des Sciences Fondamentales, Université du Québec à Chicoutimi (UQAC), 555, boulevard de l'Université, Chicoutimi, Québec, Canada G7H 2B1
| | - Charles Gauthier
- Unité Mixte de Recherche INRS-UQAC, Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 555, boulevard de l'Université, Chicoutimi, Québec, Canada G7H 2B1.,Laboratoire LASEVE, Département des Sciences Fondamentales, Université du Québec à Chicoutimi (UQAC), 555, boulevard de l'Université, Chicoutimi, Québec, Canada G7H 2B1
| |
Collapse
|
6
|
Hou Z, Wang J, Zhang X, Wang P, Song N, Li M. Synthesis of a conjugable hexasaccharide corresponding to the capsular polysaccharide of Campylobacter jejuni strain BH0142. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
7
|
Homayonia S, Ling CC. Highly Efficient and Stereoselective Synthesis of 6,7‐Dideoxy‐β‐D‐ido‐octopyranuronates. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200175] [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]
Affiliation(s)
- Saba Homayonia
- University of Calgary Department of Chemistry 2500 University Drive NW T2N 1N4 Calgary CANADA
| | - Chang-Chun Ling
- University of Calgary Department of Chemistry 2500 University Drive NW T2N 1N4 Calgary CANADA
| |
Collapse
|
8
|
Wei R, Yang X, Liu H, Wei T, Chen S, Li X. Synthetic Pseudaminic-Acid-Based Antibacterial Vaccine Confers Effective Protection against Acinetobacter baumannii Infection. ACS CENTRAL SCIENCE 2021; 7:1535-1542. [PMID: 34584955 PMCID: PMC8461771 DOI: 10.1021/acscentsci.1c00656] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Indexed: 05/05/2023]
Abstract
Acinetobacter baumannii exhibits resistance to most first-line antibiotics; thus, development of new antibacterial agents is urgently required. Pseudaminic acid exists as the surface glycan of A. baumannii. In this study, we chemically synthesized pseudaminic acid, conjugated it to carrier protein CRM197 using the OPA (ortho-phthalaldehyde) chemistry, and obtained three Pse-CRM197 conjugates with different Pse loadings. These Pse-CRM197 conjugates were found to stimulate high immune responses in mice, which protected the vaccinated mice from infections caused by Pse-producing A. baumannii. Our data indicate that chemically synthesized Pse-CRM197 conjugates can be developed into vaccines against Pse-bearing pathogens, thus offering a feasible alternative for the control of clinical infections caused by multidrug-resistant (MDR) A. baumannii, for which current treatment options are extremely limited.
Collapse
Affiliation(s)
- Ruohan Wei
- Department
of Chemistry, the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, 999077 Pokfulam, Hong Kong SAR,
P. R. China
| | - Xuemei Yang
- Department
of Infectious Diseases and Public Health, Jockey Club College of Veterinary
Medicine and Life Sciences, City University
of Hong Kong, 999077 Kowloon, Hong Kong SAR,
P. R. China
| | - Han Liu
- Department
of Chemistry, the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, 999077 Pokfulam, Hong Kong SAR,
P. R. China
| | - Tongyao Wei
- Department
of Chemistry, the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, 999077 Pokfulam, Hong Kong SAR,
P. R. China
| | - Sheng Chen
- Department
of Infectious Diseases and Public Health, Jockey Club College of Veterinary
Medicine and Life Sciences, City University
of Hong Kong, 999077 Kowloon, Hong Kong SAR,
P. R. China
| | - Xuechen Li
- Department
of Chemistry, the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, 999077 Pokfulam, Hong Kong SAR,
P. R. China
| |
Collapse
|
9
|
Li T, Wang J, Zhu X, Zhou X, Sun S, Wang P, Cao H, Yu G, Li M. Synthesis of Rare 6-Deoxy-d-/l-Heptopyranosyl Fluorides: Assembly of a Hexasaccharide Corresponding to Campylobacter jejuni Strain CG8486 Capsular Polysaccharide. J Am Chem Soc 2021; 143:11171-11179. [PMID: 34260212 DOI: 10.1021/jacs.1c05048] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Campylobacter jejuni is the leading cause of human diarrheal diseases and has been designated as one of highly resistant pathogens by the World Health Organization. The C. jejuni capsular polysaccharides feature broad existence of uncommon 6dHepp residues and have proven to be potential antigens to develop innovative antibacterial glycoconjugation vaccines. To address the lack of synthetic methods for rare 6dHepp architectures of importance, we herein describe a novel and efficient approach for the preparation of uncommon d-/l-6dHepp fluorides that have power as glycosylating agents. The synthesis is achieved by a C1-to-C5 switch strategy relying on radical decarboxylative fluorination of uronic acids arising from readily available allyl d-C-glycosides. To further showcase the application of this protocol, a structurally unique hexasaccharide composed of →3)-β-d-6didoHepp-(1→4)-β-d-GlcpNAc-(1→ units, corresponding to the capsular polysaccharide of C. jejuni strain CG8486 has been assembled for the first time. The assembly is characterized by highly efficient construction of the synthetically challenging β-(1,2-cis)-d-ido-heptopyranoside by inversion of the C2 configuration of β-(1,2-trans)-d-gulo-heptopyranoside, which is conveniently obtained by anchimerically assisted stereoselective glycosylation of the orthogonally protected 6dgulHepp fluoride. Ready accessibility of 6dHepp fluorides and the resulting glycans could serve as a rational starting point for the further development of synthetic vaccines fighting Campylobacter infection.
Collapse
Affiliation(s)
- Tiantian Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Jianjun Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Xinhao Zhu
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Xin Zhou
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Shaozi Sun
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Peng Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Hongzhi Cao
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Guangli Yu
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Ming Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| |
Collapse
|
10
|
Chen Y, Wu Z, Li X, Hu Y, Yang Y. Promoter-Assisted Stereoselective Synthesis of the 6-Deoxy-β-d- manno-heptopyranose Oligosaccharides. Org Lett 2021; 23:3216-3220. [PMID: 33797266 DOI: 10.1021/acs.orglett.1c00969] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a promoter-assisted glycosidation approach for the stereoselective synthesis of the 6-deoxy-β-d-manno-heptopyranose oligosaccharides. SphosAuNTf2-promoted glycosidation of 6-deoxy-d-manno-heptopyranosyl o-hexynylbenzoate with common alcohols afforded a range of 6-deoxy-d-manno-heptosides with good to excellent β-selectivities. The counterion and the ligand of SPhosAuNTf2 were found to have a dramatic effect on the formation of the 1,2-cis-β-linked 6-deoxy-d-manno-heptosides. This approach was effectively applied to the stereocontrolled synthesis of the 6-deoxy-β-d-manno-heptopyranose oligosaccharides relevant to Burkholderia pseudomallei and Burkholderia mallei.
Collapse
Affiliation(s)
- Yan Chen
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Zunxian Wu
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xiaona Li
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Yi Hu
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - 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
| |
Collapse
|
11
|
Nishikawa Y, Toda S, Matsui T, Takada H, Takemoto K, Hara O. Site-Selective Acylations of α- and β-Hydroxyamides in Complex Molecules: Application of Template-Driven Acylation to Disaccharides and a Glycopeptide. Org Lett 2021; 23:2715-2719. [PMID: 33734719 DOI: 10.1021/acs.orglett.1c00612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Site-selective acylations of α-and β-hydroxyamides in complex polyols are described. The combination of a pyridine aldoxime ester and Zn(OTf)2 facilitates the acylation of two types of N-glycolyl disaccharides, namely, Gal-GlcNGc and Neu5Gc-Gal, both of which are partial structures of polysaccharides responsible for biological actions, with highly site-selective modifications achieved. Furthermore, biotinylation, one of the most important techniques in chemical biology, is used to site-selectively acylate the β-hydroxyl group in a glycopeptide.
Collapse
Affiliation(s)
- Yasuhiro Nishikawa
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| | - Shione Toda
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| | - Takami Matsui
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| | - Hanae Takada
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| | - Kohei Takemoto
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| | - Osamu Hara
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, Aichi 468-8503, Japan
| |
Collapse
|