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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.
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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
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2
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Yuan SS, Li ML, Chen JS, Zhou L, Zhou W. Application of Mono- and Disaccharides in Drug Targeting and Efficacy. ChemMedChem 2018; 13:764-778. [DOI: 10.1002/cmdc.201700762] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 02/10/2018] [Indexed: 12/14/2022]
Affiliation(s)
- Si S. Yuan
- School of Pharmaceutical Sciences; Guangzhou University of Chinese Medicine; E. 232 University Town, Waihuan Road Panyu Guangzhou 510006 China
| | - Mao L. Li
- School of Pharmaceutical Sciences; Guangzhou University of Chinese Medicine; E. 232 University Town, Waihuan Road Panyu Guangzhou 510006 China
| | - Jian S. Chen
- College of Horticulture; South China Agricultural University; 483 Wushan Road Guangzhou 510642 China
| | - Li Zhou
- College of Science; Hunan Agricultural University; Furong Road Changsha 410128 China
| | - Wen Zhou
- School of Pharmaceutical Sciences; Guangzhou University of Chinese Medicine; E. 232 University Town, Waihuan Road Panyu Guangzhou 510006 China
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3
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Lu X, Huang X. Design and syntheses of hyaluronan oligosaccharide conjugates as inhibitors of CD44-Hyaluronan binding. Glycoconj J 2015; 32:549-56. [PMID: 25997408 DOI: 10.1007/s10719-015-9597-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 04/14/2015] [Accepted: 05/08/2015] [Indexed: 10/23/2022]
Abstract
Hyaluronan (HA) is an integral component of the extracellular matrix. Its interactions with a cell surface receptor CD44 has been shown to play important roles in a variety of biological events including cell proliferation and metastasis. As multivalent CD44-HA binding is critical for downstream signaling, compounds that can selectively disrupt the complex formation of HA polysaccharide with CD44 can serve as useful probes of CD44 mediated cellular events as well as potential leads for novel therapeutics. Herein, we report the synthesis of several series of HA conjugates to target the HA binding pocket of CD44. As a small library of HA disaccharide derivatives failed to exhibit any inhibitory activities, we focused on HA tetrasaccharide based analogs. Traditional synthetic strategies towards HA oligosaccharides involve the construction of backbone from the corresponding monosaccharide building blocks, which can be quite tedious. In order to expedite the synthesis, we designed a new synthetic route taking advantage of the ability of hyaluronidase to generate large quantities of HA tetrasaccharide through digestion of HA polysaccharides. The HA tetrasaccharide obtained was utilized to prepare multiple S-linked HA analogs bearing aromatic groups at the reducing end glycan. One such compound containing an m-benzyl phenyl moiety exhibited significant inhibition of CD44-HA binding. Our approach provides a new direction towards the design of HA based CD44 antagonists.
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Affiliation(s)
- Xiaowei Lu
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA.,NIDDK, National Institutes of Health, Building 8, Room 1A21, 9000 Rockville Pike, Bethesda, MD, 20892-0815, USA
| | - Xuefei Huang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA.
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4
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Ishizuka Y, Nemoto T, Fujiwara M, Fujita KI, Nakanishi H. Three-Dimensional Structure of Fucosyllactoses in an Aqueous Solution. J Carbohydr Chem 2008. [DOI: 10.1080/07328309908544016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Xia C, Zhou D, Liu C, Lou Y, Yao Q, Zhang W, Wang PG. Thio-isoglobotrihexosylceramide, an agonist for activating invariant natural killer T cells. Org Lett 2007; 8:5493-6. [PMID: 17107055 DOI: 10.1021/ol062199b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thio-isoglobotrihexosylceramide (S-iGb3) might be resistant to alpha-galactosidases in antigen-presenting cells and have a longer retaining time in the lysosome before being loaded to CD1d. The biological assay showed that S-iGb3 demonstrates a much higher increase as a stimulatory ligand toward invariant natural killer T (iNKT) cells as compared to iGb3. [structure: see text].
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Affiliation(s)
- Chengfeng Xia
- Departments of Biochemistry and Chemistry, The Ohio State University, Columbus, Ohio 43210, USA
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6
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Witczak ZJ, Lorchak D, Nguyen N. A click chemistry approach to glycomimetics: Michael addition of 2,3,4,6-tetra-O-acetyl-1-thio-β-d-glucopyranose to 4-deoxy-1,2-O-isopropylidene-l-glycero-pent-4-enopyranos-3-ulose – a convenient route to novel 4-deoxy-(1→5)-5-C-thiodisaccharides. Carbohydr Res 2007; 342:1929-33. [PMID: 17588551 DOI: 10.1016/j.carres.2007.06.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Revised: 05/30/2007] [Accepted: 06/02/2007] [Indexed: 11/19/2022]
Abstract
The base catalyzed conjugate Michael addition of the 1-thiosugar, 2,3,4,6-tetra-O-acetyl-beta-D-glucopyranose, 1, to a new highly reactive enone 4-deoxy-1,2-O-isopropylidene-L-glycero-pent-4-enopyranos-3-ulose, 2, proceeds steroselectively with formation of adduct 3 in 94% yield. Convenient stereoselective reduction of the C-3 keto function of 3 with L-Selectride followed by in situ acetylation produces thiodisaccharide 4 in good 82% yield. Cleavage of the 1,2-O-isopropylidene protecting group with p-toluenesulfonic acid in methanol, followed by de-O-acetylation, produced an inseparable anomeric mixture of methyl 4-deoxy-5-C-(beta-D-glucopyranosyl)-thio-alpha/beta-L-ribo-pyranoside 5 in 72% overall yield. This approach constitutes a new general two-step click chemistry route to the previously unknown class of 4-deoxy-(1-->5)-5-C-thiodisaccharides as stable and biologically important glycomimetics.
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Affiliation(s)
- Zbigniew J Witczak
- Department of Pharmaceutical Sciences, Nesbitt School of Pharmacy, Wilkes University, 84 W. South Street, Wilkes-Barre, PA 18766, USA.
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7
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Rich JR, Wakarchuk WW, Bundle DR. Chemical and Chemoenzymatic Synthesis of S-Linked Ganglioside Analogues and Their Protein Conjugates for Use as Immunogens. Chemistry 2006; 12:845-58. [PMID: 16196067 DOI: 10.1002/chem.200500518] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Analogues of the tumor-associated gangliosides GM(3) and GM(2) containing terminal S-linked neuraminic acid residues and an amino terminated, truncated ceramide homologue have been synthesized and conjugated to a protein. The synthesis involved coupling of a S-linked sialyl alpha(2-->3) galactose disaccharide with a glucosyl sphingosine analogue, followed by elaboration and deprotection to give amino-terminated glycosyl ceramide 1. Glycosyltransferase-catalyzed extension of the trisaccharide 1 provided access to the modified GM(2) tetrasaccharide 2 or sulphur-containing GD(3) analogue 30. Owing to their potentially enhanced resistance to endogenous exo-glycoside hydrolases and their inherent non-self character, carbohydrate antigens containing non-reducing terminal thioglycosidic linkages may be more immunogenic than O-linked antigens and may stimulate the production of antibodies capable of recognizing naturally occurring oligosaccharides. Our initial results suggest that in fact these antigens are viable immunogens and furthermore, that immune sera cross reacts with O-gangliosides in the context of a heterologous glycoprotein conjugate.
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Affiliation(s)
- Jamie R Rich
- Alberta Ingenuity Centre for Carbohydrate Science, Department of Chemistry, University of Alberta, Edmonton, Canada
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Yuriev E, Farrugia W, Scott AM, Ramsland PA. Three-dimensional structures of carbohydrate determinants of Lewis system antigens: implications for effective antibody targeting of cancer. Immunol Cell Biol 2005; 83:709-17. [PMID: 16266323 DOI: 10.1111/j.1440-1711.2005.01374.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Lewis system carbohydrate antigens have been shown to be expressed at high levels in many cancers of epithelial cell origin, including those of colon, breast, lung, prostate and ovary. The type 1 (Le(a) and Le(b)) antigens are important histo-blood groups, while type 2 (Le(x) and Le(y)) antigens in healthy individuals are only expressed, at relatively low levels, by a few tissues, including some epithelial cells. Thus, the type 2 antigens are considered to be tumour-associated antigens and are promising targets for cancer treatment, including antibody-based immunotherapy. In this review, we discuss the conformational characteristics of the free and bound forms of Lewis oligosaccharides and the 3D structures of antibodies in complex with Le(y) and Le(x) antigens. Collectively, the structural studies have demonstrated that the Lewis determinants are rigid structures, which generally maintain the same conformation in the free and bound states. The rigid nature and similarities in shape of type 1 and 2 Lewis oligosaccharides appear to make them perfectly suited to driving a structurally convergent immune response (at least in the case of Le(y) specific antibodies) toward a highly specific recognition of individual carbohydrate determinants, which is a goal in the development of effective antibody-based cancer treatments.
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Affiliation(s)
- Elizabeth Yuriev
- Department of Medicinal Chemistry, Victorian College of Pharmacy, Monash University, Victoria, Australia
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9
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Bekiroglu S, Kenne L, Sandström C. NMR study on the hydroxy protons of the Lewis X and Lewis Y oligosaccharides. Carbohydr Res 2005; 339:2465-8. [PMID: 15388363 DOI: 10.1016/j.carres.2004.07.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2004] [Revised: 06/28/2004] [Accepted: 07/11/2004] [Indexed: 11/20/2022]
Abstract
The 1H NMR chemical shifts and NOEs of hydroxy protons in Lewis X trisaccharide, beta-D-Galp-(1-->4)[alpha-L-Fucp-(1-->3)]-beta-D-GlcpNAc, and Lewis Y tetrasaccharide, alpha-L-Fucp-(1-->2)-beta-D-Galp-(1-->4)[alpha-L-Fucp-(1-->3)]-beta-D-GlcpNAc, were obtained for 85% H2O/15% (CD3)2CO solutions. The OH-4 signal of Galp in Lewis X and OH-3, OH-4 signals of Galp, and OH-2 signal of Fucp linked to Galp in Lewis Y had chemical shifts which indicate reduced hydration due to their proximity to the hydrophobic face of the Fucp unit linked to GlcpNAc. The inter-residue NOEs involving the exchangeable NH and OH protons confirmed the stacking interaction between the Fucp linked to the GlcpNAc and the Galp residues in Lewis X and Lewis Y.
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Affiliation(s)
- Somer Bekiroglu
- Department of Chemistry, Swedish University of Agricultural Sciences, PO Box 7015, SE-750 07 Uppsala, Sweden
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10
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Abstract
[structure: see text] Glycosidase resistant thioglycoside precursors of the melanoma-associated ganglioside GM(2) have been synthesized starting from lactose. Syntheses of several analogues of ganglioside GM(3) and a positional isomer have been developed. These compounds contain thio-linked sialic acid residues and a modified ceramide aglycon functionalized for coupling to proteins, surfaces, or matrices. The hydrolytic stability of these oligosaccharides enhances the immunogenicity of the corresponding conjugate vaccines by ensuring their integrity in the acidic compartments of antigen processing cells.
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Affiliation(s)
- Jamie R Rich
- Alberta Ingenuity Centre for Carbohydrate Science, Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada.
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11
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Nitz M, Ling CC, Otter A, Cutler JE, Bundle DR. The unique solution structure and immunochemistry of the Candida albicans beta -1,2-mannopyranan cell wall antigens. J Biol Chem 2002; 277:3440-6. [PMID: 11700318 DOI: 10.1074/jbc.m109274200] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Synthetic oligomers of the antigenic Candida albicans (1-->2)-beta-mannopyranans adopt a compact solution conformation that leads to numerous inter-residue nuclear Overhauser effects, including unprecedented nuclear Overhauser effects between n and n + 3 residues. In excellent agreement with experimentally determined distances, unrestrained molecular dynamics point to a single family of conformations that approximate a compact helical motif with a three-residue repeat for this unique homopolymer. When the synthetic di- to hexasaccharides were employed as inhibitors of monoclonal antibodies, which protect mice against a lethal dose of the yeast pathogen, a novel pattern of inhibitor activity was observed. Instead of the paradigm first reported by Kabat (Kabat, E. A. (1962) Fed. Proc. 21, 694-701; Kabat, E. A. (1966) J. Immunol. 97, 1-11), wherein homo-oligosaccharides exhibit increasing inhibitory activity with increasing size, here the maximum activity is reached for di- and trisaccharides and diminishes significantly for tetra-, penta-, and hexasaccharides. These immunochemical data correlate with the ordered conformation of the beta-1,2-linked mannopyranan and imply that a uniquely small antigenic determinant has potential as a component of synthetic conjugate vaccines against Candida albicans.
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Affiliation(s)
- Mark Nitz
- Department of Chemistry, the University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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12
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Abstract
Oligosaccharides in which at least one glycosidic oxygen atom is replaced with a sulfur atom can be routinely synthesized and act as competitive inhibitors of various glycoside hydrolases. Recent studies using both X-ray crystallography and other biophysical techniques provide structural insight into binding, recognition, and the catalytic mechanism of action of these enzymes.
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Affiliation(s)
- H Driguez
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), Affiliated with Université Joseph Fourier, Grenoble B.P. 53, 38041 Grenoble cedex 9, France.
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13
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Xia J, Alderfer JL, Piskorz CF, Matta KL. The 2-naphthylmethyl (NAP) group in carbohydrate synthesis: first total synthesis of the GlyCAM-1 oligosaccharide structures. Chemistry 2001; 7:356-67. [PMID: 11271521 DOI: 10.1002/1521-3765(20010119)7:2<356::aid-chem356>3.0.co;2-e] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Total syntheses of the GlyCAM-1 (glycosylation-dependent cell adhesion molecule-1) oligosaccharide structures: [alpha-NeuAc-(2 --> 3)-beta-Gal-(1 --> 4)-[alpha-Fuc-(1 --> 3)]-beta-(6-O-SO3Na)-GlcNAc-(1 --> 6)]-[alpha-NeuAc-(2 --> 3)-beta-Gal-(1 --> 3)]-alpha-GalNAc-OMe (1) and [alpha-NeuAc-(2 --> 3)-beta-Gal-(1 --> 4)-[alpha-Fuc-(1 --> 3)]-beta-GlcNAc-(1 --> 6)]-[alpha-NeuAc-(2 3)-beta-Gal-(1 --> 3)]-alpha-GalNAc-OMe (2) through a novel sialyl LewisX tetrasaccharide donor are described. Employing sequential glycosylation strategy, the starting trisaccharide was regio- and stereoselectively constructed through coupling of a disaccharide imidate with the monosaccharide acceptor phenyl-6-O-naphthylmethyl-2-deoxy-2-phthalimido-1-thio-beta-D-glucopyranoside with TMSOTf as a catalyst without affecting the SPh group. The novel sialyl Lewisx tetrasaccharide donor 3 was then obtained by alpha-L-fucosylation of trisaccharide acceptor with the 2,3,4-tri-O-benzyl-1-thio-beta-L-fucoside donor. The structure of the novel sialyl Lewisx tetrasaccharide was established by a combination of 2D DQF-COSY and 2D ROESY experiments. Target oligosaccharides 1 and 2 were eventually constructed through heptasaccharide which was obtained by regioselective assembly of advanced sialyl Lewisx tetrasaccharide donor 3 and a sialylated trisaccharide acceptor in a predictable and controlled manner. Finally, target heptasaccharides 1 and 2 were fully characterized by 2D DQF-COSY, 2D ROESY, HSQC, HMBC experiments and FAB mass spectroscopy.
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Affiliation(s)
- J Xia
- Molecular and Cellular Biophysics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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14
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Bekiroglu S, Sandström C, Norberg T, Kenne L. Hydroxy protons in conformational study of a Lewis b tetrasaccharide derivative in aqueous solution by NMR spectroscopy. Carbohydr Res 2000; 328:409-18. [PMID: 11072848 DOI: 10.1016/s0008-6215(00)00104-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The 1H NMR chemical shifts, vicinal coupling constants, temperature coefficients, and exchange rates of the hydroxy protons of a Lewis b tetrasaccharide derivative, alpha-L-Fucp-(1 --> 2)-beta-D-Galp-(1 --> 3)[alpha-L-Fucp-(1 --> 4)]-beta-D-GlcpNAc-1-O(CH2)2NHCOCHCH2, have been measured in aqueous solution. The data did not show any evidence for persistent hydrogen bonds participating in the stabilization of the structure. While most of the hydroxy proton signals have chemical shifts similar to those of the corresponding methyl glycosides, four of them, O(3)H, O(4)H, and O(6)H of Galp, and O(2)H of the Fucp linked to GlcpNAc, exhibit large upfield shifts. This shielding effect has been attributed to the orientation of the hydroxy protons toward the amphiphilic region constituted by the hydroxy groups of the Galp residue and mainly the ring and methyl hydrogens of the Fucp unit attached to the GlcpNAc. The close face to face stacking interaction between the Fucp linked to the GlcpNAc and the Galp residues, as well as the steric interaction between the Fucp linked to the Galp and the GlcpNAc are confirmed by the additional inter-residue NOEs of the exchangeable protons in sugar units which are not directly connected.
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Affiliation(s)
- S Bekiroglu
- Department of Chemistry, Swedish University of Agricultural Sciences, Uppsala
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15
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Geyer A, Gege C, Schmidt RR. Calcium-Dependent Carbohydrate-Carbohydrate Recognition between Lewis(X) Blood Group Antigens This research was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie. Angew Chem Int Ed Engl 2000; 39:3245-3249. [PMID: 11028065 DOI: 10.1002/1521-3773(20000915)39:18<3245::aid-anie3245>3.0.co;2-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- A Geyer
- Fachbereich Chemie M716 der Universität Konstanz 78457 Konstanz (Germany)
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16
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17
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Montero E, García-Herrero A, Asensio J, Hirai K, Ogawa S, Santoyo-González F, Cañada F, Jiménez-Barbero J. The Conformational Behaviour of Non-Hydrolizable Lactose Analogues: The Thioglycoside, Carbaglycoside, and Carba-Iminoglycoside Cases. European J Org Chem 2000. [DOI: 10.1002/(sici)1099-0690(200005)2000:10<1945::aid-ejoc1945>3.0.co;2-g] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Thio-sugars. Part 5: From d-glucal to 3-deoxy-(1→2)-2-S-thiodisaccharides through isolevoglucosenone—a simple approach. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(99)00567-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Fuchss T, Schmidt RR. 5-Amino-5-Deoxy-1-Thioglucopyranosides-Synthesis of Thioglycoside Derivatives of Nojirimycin. J Carbohydr Chem 2000. [DOI: 10.1080/07328300008544110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Geyer A, Müller M, Schmidt RR. A Glycosidic Linkage Constrained to the “Anti” Conformation. J Am Chem Soc 1999. [DOI: 10.1021/ja990294s] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Armin Geyer
- Fakultät für Chemie, Universität Konstanz D-78457 Konstanz, Germany
| | - Matthias Müller
- Fakultät für Chemie, Universität Konstanz D-78457 Konstanz, Germany
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21
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Simanek EE, McGarvey GJ, Jablonowski JA, Wong CH. Selectinminus signCarbohydrate Interactions: From Natural Ligands to Designed Mimics. Chem Rev 1998; 98:833-862. [PMID: 11848916 DOI: 10.1021/cr940226i] [Citation(s) in RCA: 375] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Eric E. Simanek
- Department of Chemistry, The Skaggs Institute for Chemical Biology and The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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22
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Aguilera B, Jiménez-Barbero J, Fernández-Mayoralas A. Conformational differences between Fuc(alpha 1-3) GlcNAc and its thioglycoside analogue. Carbohydr Res 1998; 308:19-27. [PMID: 9675354 DOI: 10.1016/s0008-6215(98)00066-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
NOE measurements and molecular mechanics calculations have been performed to study the conformational behaviour of Fuc(alpha 1-3)GlcNAc and its thioglycoside analogue in solution. Experimental data show that, in contrast with the natural O-disaccharide, which is basically monoconformational, the S-analogue shows two conformational families, namely syn and anti.
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Affiliation(s)
- B Aguilera
- Departmento de Química Orgánica Biológica, Instituto de Química Orgánica, CSIC, Madrid, Spain
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23
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Montero E, Vallmitjana M, Pérez-Pons JA, Querol E, Jiménez-Barbero J, Cañada FJ. NMR studies of the conformation of thiocellobiose bound to a beta-glucosidase from Streptomyces sp. FEBS Lett 1998; 421:243-8. [PMID: 9468315 DOI: 10.1016/s0014-5793(97)01571-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The conformation of 4-thiocellobiose bound to beta-glucosidase from Streptomyces sp. has been studied by 1H-NMR transferred nuclear Overhauser effect spectroscopy (TR-NOE). Thiocellobiose behaves as an inhibitor of this glucosidase when cellobiose is used as substrate. NOE measurements and molecular mechanics calculations have also been performed to estimate the probability distribution of conformers of thiocellobiose when free in solution. Experimental data show that, in contrast with the natural O-analogue, thiocellobiose presents three conformational families in the free state, namely syn, anti-psi and anti-phi, whilst only one of them (syn) is recognized by the enzyme.
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Affiliation(s)
- E Montero
- Instituto de Química Orgánica, CSIC, Madrid, Spain
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24
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Geyer A, Reinhardt S, Bendas G, Rothe U, Schmidt RR. C2-Symmetric Lewis Antigen Mimetics Exhibiting the Common Structural Motif. J Am Chem Soc 1997. [DOI: 10.1021/ja972764t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Armin Geyer
- Fakultät für Chemie, Universität Konstanz Postfach 5560, D-78434 Konstanz, Germany Fachbereich Pharmazie, Universität Halle Langenbeckstrasse 4, D-06120 Halle, Germany
| | - Stefan Reinhardt
- Fakultät für Chemie, Universität Konstanz Postfach 5560, D-78434 Konstanz, Germany Fachbereich Pharmazie, Universität Halle Langenbeckstrasse 4, D-06120 Halle, Germany
| | - G. Bendas
- Fakultät für Chemie, Universität Konstanz Postfach 5560, D-78434 Konstanz, Germany Fachbereich Pharmazie, Universität Halle Langenbeckstrasse 4, D-06120 Halle, Germany
| | - U. Rothe
- Fakultät für Chemie, Universität Konstanz Postfach 5560, D-78434 Konstanz, Germany Fachbereich Pharmazie, Universität Halle Langenbeckstrasse 4, D-06120 Halle, Germany
| | - Richard R. Schmidt
- Fakultät für Chemie, Universität Konstanz Postfach 5560, D-78434 Konstanz, Germany Fachbereich Pharmazie, Universität Halle Langenbeckstrasse 4, D-06120 Halle, Germany
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Eisele T, Schmidt RR. Synthesis of Thio-Linked Analogues of Lewis X and Sialyl Lewis X. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jlac.199719970705] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Witczak ZJ, Chhabra R, Chen H, Xie XQ. Thiosugars II. A novel approach to thiodisaccharides The synthesis of 3-deoxy-4-thiocellobiose from levoglucosenone. Carbohydr Res 1997. [DOI: 10.1016/s0008-6215(97)00100-6] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Carpintero M, Fernández-Mayoralas A, Jaramillo C. Protecting Group-Directed, Diastereoselective Samarium Diiodide-Promoted Carbocyclization: Application to the Synthesis of Cyclitols. J Org Chem 1997; 62:1916-1917. [PMID: 11671488 DOI: 10.1021/jo9623898] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mercedes Carpintero
- Instituto de Química Orgánica General, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain
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Hummel G, Schmidt RR. A versatile synthesis of the lactoneo-series antigens — synthesis of sialyl dimer Lewis X and of dimer Lewis Y. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)00006-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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