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Abronina PI, Podvalnyy NM, Kononov LO. The use of silyl groups in the synthesis of arabinofuranosides. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3371-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Umesiri FE, Sanki AK, Boucau J, Ronning DR, Sucheck SJ. Recent advances toward the inhibition of mAG and LAM synthesis in Mycobacterium tuberculosis. Med Res Rev 2010; 30:290-326. [DOI: 10.1002/med.20190] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Aqueel MS, Pathak V, Pathak AK. Concise assembly of linear alpha(1-->6)-linked octamannan fluorescent probe. Tetrahedron Lett 2008; 49:7157-7160. [PMID: 20011026 PMCID: PMC2598757 DOI: 10.1016/j.tetlet.2008.09.164] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Synthesis of a fluorescently labelled (dansylated) linear alpha(1-->6)-linked octamannan, using glycosyl fluoride donors and thioglycosyl acceptors is described. A selective and convergent two-stage activation progression was executed to construct di-, tetra and octa-mannosyl thioglycosides in three glycosylation steps with excellent yield. Further a 5-N,N-Dimethylaminonaphthalene-1-sulfonamidoethyl (dansyl) group was coupled to 1-azidoethyl octamannosyl thioglycoside. Global deprotection of the coupled product afforded the desired dansylated homo-linear alpha(1-->6)-linked octamannan.
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Affiliation(s)
- Mohammad S. Aqueel
- Department of Chemistry, Western IllinoisUniversity, Macomb, IL 61455, USA
| | - Vibha Pathak
- Department of Chemistry, Western IllinoisUniversity, Macomb, IL 61455, USA
| | - Ashish K. Pathak
- Department of Chemistry, Western IllinoisUniversity, Macomb, IL 61455, USA
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Pathak AK, Pathak V, Seitz L, Gurcha SS, Besra GS, Riordan JM, Reynolds RC. Disaccharide analogs as probes for glycosyltransferases in Mycobacterium tuberculosis. Bioorg Med Chem 2007; 15:5629-50. [PMID: 17544276 PMCID: PMC2699567 DOI: 10.1016/j.bmc.2007.04.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2007] [Revised: 04/02/2007] [Accepted: 04/04/2007] [Indexed: 11/25/2022]
Abstract
Glycosyltransferases (GTs) play a crucial role in mycobacterial cell wall biosynthesis and are necessary for the survival of mycobacteria. Hence, these enzymes are potential new drug targets for the treatment of tuberculosis (TB), especially multiple drug-resistant TB (MDR-TB). Herein, we report the efficient syntheses of Araf(alpha 1-->5)Araf, Galf(beta 1-->5)Galf, and Galf(beta 1-->6)Galf disaccharides possessing a 5-N,N-dimethylaminonaphthalene-1-sulfonamidoethyl (dansyl) unit that were prepared as fluorescent disaccharide acceptors for arabinosyl- and galactosyl-transferases, respectively. Such analogs may offer advantages relative to radiolabeled acceptors or donors for studying the enzymes and for assay development and compound screening. Additionally, analogs possessing a 5-azidonaphthalene-1-sulfonamidoethyl unit were prepared as photoaffinity probes for their potential utility in studying active site labeling of the GTs (arabinosyl and galactosyl) in Mycobacterium tuberculosis (MTB). Beyond their preparation, initial biological testing and kinetic analysis of these disaccharides as acceptors toward glycosyltransferases are also presented.
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Affiliation(s)
- Ashish K. Pathak
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - Vibha Pathak
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - Lainne Seitz
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - Sudagar S. Gurcha
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gurdyal S. Besra
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - James M. Riordan
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - Robert C. Reynolds
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
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Pathak AK, Pathak V, Riordan JR, Suling WJ, Gurcha SS, Besra GS, Reynolds RC. Synthesis of symmetrical C- and pseudo-symmetrical O-linked disaccharide analogs for arabinosyltransferase inhibitory activity in Mycobacterium tuberculosis. Bioorg Med Chem Lett 2007; 17:4527-30. [PMID: 17566735 PMCID: PMC2699574 DOI: 10.1016/j.bmcl.2007.05.099] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Revised: 05/23/2007] [Accepted: 05/30/2007] [Indexed: 11/26/2022]
Abstract
Herein we report the synthesis of symmetrical C-linked and pseudo-symmetrical O-linked disaccharides structurally related to Araf motifs present in the cell wall of MTB. Their activity in a competition-based arabinosyltransferase assay using [14C]-DPA as the glycosyl donor is also presented. In addition, in vitro inhibitory activity for the disaccharides was determined in a colorimetric broth microdilution assay system against MTB H37Ra and Mycobacterium avium.
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Affiliation(s)
| | - Vibha Pathak
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - James R. Riordan
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - William J. Suling
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
| | - Sudagar S. Gurcha
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gurdyal S. Besra
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Robert C. Reynolds
- Drug Discovery Division, Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255, USA
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Constable EC, Frantz R, Housecroft CE, Lacour J, Mahmood A. Chiral Induction in a Ribose-Decorated Metallostar through Intrinsic and Interionic Diastereomeric Interactions. Inorg Chem 2004; 43:4817-9. [PMID: 15285654 DOI: 10.1021/ic049392r] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A ribose-functionalized bpy ligand has been prepared and shown to give modest diastereomeric excesses of Lambda-[FeL(3)](2+) complexes; interconversion of Delta and Lambda cations is relatively fast, and in CHCl(3), the favored complexes with Delta- or Lambda-TRISPHAT counterions are homochiral, (Delta(+)Delta(-)) or (Lambda(+)Lambda(-)). In the case of the Delta-TRISPHAT salt, a single diastereomer is observed (de > or = 96%).
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Affiliation(s)
- Edwin C Constable
- Department of Chemistry, University of Basel, Spitalstrasse 51, CH 4056 Basel, Switzerland.
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Pathak AK, Pathak V, Riordan JM, Gurcha SS, Besra GS, Reynolds RC. Synthesis of mannopyranose disaccharides as photoaffinity probes for mannosyltransferases in Mycobacterium tuberculosis. Carbohydr Res 2004; 339:683-91. [PMID: 15013406 DOI: 10.1016/j.carres.2003.10.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2003] [Accepted: 10/30/2003] [Indexed: 11/21/2022]
Abstract
Mannosyltransferases play a crucial role in mycobacterial cell-wall biosynthesis and are potential new drug targets for the treatment of tuberculosis. Herein, we describe the synthesis of alpha-(1-->2)- and alpha-(1-->6)-linked mannopyranosyl disaccharides possessing a 5-azidonaphthlene-1-sulfonamidoethyl group as photoaffinity probes for active-site labeling studies of mannosyltransferases in Mycobacterium tuberculosis.
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Affiliation(s)
- Ashish K Pathak
- Drug Discovery Division, Southern Research Institute, PO Box 55305, Birmingham, AL 35225-5305, USA
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Wen X, Crick DC, Brennan PJ, Hultin PG. Analogues of the mycobacterial arabinogalactan linkage disaccharide as cell wall biosynthesis inhibitors. Bioorg Med Chem 2003; 11:3579-87. [PMID: 12901902 DOI: 10.1016/s0968-0896(03)00366-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The mycobacterial arabinogalactan linkage disaccharide [alpha-L-Rha-(1-->3)-alpha-D-GlcNAc] provides a basis for the design of new antitubercular drugs, since it supports a key skeletal structure in the bacterial cell wall. A series of analogues of the linker was synthesized by coupling appropriate thiorhamnosyl donors modified at their 4-positions, with an N-acetyl glucosamine acceptor. In a cell-free enzyme inhibition assay, three analogues inhibited the activity of the galactosyltransferase that adds a Galf residue to the linkage disaccharide. Although the compounds were modest inhibitors, these data confirm the viability of this approach to anti-mycobacterial agents. It is especially significant that the three effective compounds are modified at the site of the acceptor atom in the natural substrate.
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Affiliation(s)
- Xianghui Wen
- Department of Chemistry, University of Manitoba, R3T 2N2, Winnipeg, MB, Canada
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Pathak AK, Pathak V, Gurcha SS, Besra GS, Reynolds RC. Synthesis of an arabinofuranosyl disaccharide photoaffinity probe for arabinosyltransferase activity in Mycobacterium tuberculosis. Bioorg Med Chem Lett 2002; 12:2749-52. [PMID: 12217368 DOI: 10.1016/s0960-894x(02)00536-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
(5-Azidonaphthalene-1-sulfonamidoethyl)-5-O-(alpha-arabinofuranosyl)-alpha-D-arabinofuranoside 1 was synthesized as a photoaffinity probe for the determination of arabinosyl transferase activity and for the identification of binding and functional sites in Mycobacterium tuberculosis.
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Affiliation(s)
- Ashish K Pathak
- Department of Organic Chemistry, Southern Research Institute, Birmingham, AL 35255, USA
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Pathak AK, Pathak V, Suling WJ, Gurcha SS, Morehouse CB, Besra GS, Maddry JA, Reynolds RC. Studies on n-octyl-5-(alpha-D-arabinofuranosyl)-beta-D-galactofuranosides for mycobacterial glycosyltransferase activity. Bioorg Med Chem 2002; 10:923-8. [PMID: 11836099 DOI: 10.1016/s0968-0896(01)00343-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The mycobacterial cell wall is a potential target for new drug development. Herein we report the preparation and activity of several n-octyl-5-(alpha-D-arabinofuranosyl)-beta-D-galactofuranoside derivatives. A cell-free assay system has been utilized for determination of the ability of disaccharide analogues to act as arabinosyltransferase acceptors using [14C]-DPA as the glycosyl donor. In addition, in vitro inhibitory activity has been determined in a colorimetric broth microdilution assay system against MTB H37Ra and three clinical isolates of Mycobacterium avium complex (MAC). One of these disaccharides showed moderate activity against MTB. The biological evaluation of these disaccharides suggests that more hydrophobic analogues with a blocked reducing end showed better activity as compared to a totally deprotected disaccharide that more closely resembles the natural substrates in cell wall biosynthesis.
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Affiliation(s)
- Ashish K Pathak
- Department of Organic Chemistry, Southern Research Institute, PO Box 55305, Birmingham, AL 35255, USA
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Pathak AK, Pathak V, Seitz L, Maddry JA, Gurcha SS, Besra GS, Suling WJ, Reynolds RC. Studies on (beta,1-->5) and (beta,1-->6) linked octyl Gal(f) disaccharides as substrates for mycobacterial galactosyltransferase activity. Bioorg Med Chem 2001; 9:3129-43. [PMID: 11711288 DOI: 10.1016/s0968-0896(01)00179-1] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The emergence of multi-drug resistant (MDR) strains of Mycobacterium tuberculosis (MTB) and the continuing pandemic of tuberculosis emphasizes the urgent need for the development of new anti-tubercular agents with novel drug targets. The recent structural elucidation of the mycobacterial cell wall highlights a large variety of structurally unique components that may be a basis for new drug development. This publication describes the synthesis, characterization, and screening of several octyl Galf(beta,1-->5)Galf and octyl Galf(beta,1-->6)Galf derivatives. A cell-free assay system has been utilized for galactosyltransferase activity using UDP[14C]Galf as the glycosyl donor, and in vitro inhibitory activity has been determined in a colorimetric broth microdilution assay system against MTB H37Ra and three clinical isolates of Mycobacterium avium complex (MAC). Certain derivatives showed moderate activities against MTB and MAC. The biological evaluation of these disaccharides suggests that more hydrophobic analogues with a blocked reducing end showed better activity as compared to totally deprotected disaccharides that more closely resemble the natural substrates in cell wall biosynthesis.
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Affiliation(s)
- A K Pathak
- Department of Organic Chemistry, Southern Research Institute, PO Box 55305, Birmingham, AL 35255-5305, USA
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Pathak AK, Pathak V, Maddry JA, Suling WJ, Gurcha SS, Besra GS, Reynolds RC. Studies on alpha(1-->5) linked octyl arabinofuranosyl disaccharides for mycobacterial arabinosyl transferase activity. Bioorg Med Chem 2001; 9:3145-51. [PMID: 11711289 DOI: 10.1016/s0968-0896(01)00180-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The appearance multi-drug resistant Mycobacterium tuberculosis (MTB) throughout the world has prompted a search for new, safer and more active agents against tuberculosis. Based on studies of the biosynthesis of mycobacterial cell wall polysaccharides, octyl 5-O-(alpha-D-arabinofuranosyl)-alpha-D-arabinofuranoside analogues were synthesized and evaluated as inhibitors for M. tuberculosis and Mycobacterium avium. A cell free assay system has been used for the evaluation of these disaccharides as substrates for mycobacterial arabinosyltransferase activity.
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Affiliation(s)
- A K Pathak
- Department of Organic Chemistry, Southern Research Institute, PO Box 55305, Birmingham, AL 35255, USA
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