Glycans are polymeric carbohydrates found in all living things. They are of fundamental importance within the body because of their involvement in cell-cell communication and other cellular recognition processes and they are of fundamental importance in infectious disease because of their presence as antigenic determinants in bacteria, fungi, and viruses. Determining the structures of these molecules at a molecular level and establishing the structural motifs important in these molecular recognition processes is one of the central themes in the field of glycobiology but, unfortunately, progress toward these goals has been hampered by the lack of a truly general method for structural analysis using small amounts of material. One of the major goals of the present proposal is to develop electrochemical reductive cleavage as a means to fully characterize glycans. Guiding the development of the method will be its application to the analysis of synthetically prepared oligosaccharide libraries, glycoprotein- and glycolipid-derived oligosaccharides, and the capsular polysaccharides and lipopolysaccharides derived from several strains of Porphyromonas gingivalis, one of the major causative agents of periodontal disease. The other major goal of the present proposal is to develop a variant of the Reductive-Cleavage Method that is at least 1000-fold more sensitive. The proposed method will take advantage of the sensitivity of an electron capture GLC detector by analyzing reductive cleavage fragments as their trifluoropropyl ether/trifluoropropionyl ester derivatives. Guiding the development of this method will also be its application to glycoprotein- and glycolipid-derived oligosaccharides.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
2R01GM034710-13
Application #
2406515
Study Section
Medicinal Chemistry Study Section (MCHA)
Project Start
1985-04-01
Project End
2000-08-31
Budget Start
1997-09-01
Budget End
1998-08-31
Support Year
13
Fiscal Year
1997
Total Cost
Indirect Cost
Name
University of Minnesota Twin Cities
Department
Chemistry
Type
Other Domestic Higher Education
DUNS #
168559177
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
Kim, Eun Ju; Gray, Gary R (2009) Use of ionically tagged glycosyl donors in the synthesis of oligosaccharide libraries. Bioorg Med Chem Lett 19:6679-81
Farquharson, S I; Germaine, G R; Gray, G R (2000) Isolation and characterization of the cell-surface polysaccharides of Porphyromonas gingivalis ATCC 53978. Oral Microbiol Immunol 15:151-7
Elvebak 2nd, L E; Smith, S O; Gray, G R (2000) Authentic standards for the reductive-cleavage method. The positional isomers of partially methylated and acetylated or benzoylated methyl 2-(acetylmethylamino)-2-deoxy-beta-D-glucopyranoside. Carbohydr Res 329:799-805
El Hilali, C M; Lamosse, T A; Gray, G R (2000) Authentic standards for the reductive-cleavage method. The positional isomers of partially methylated and acetylated or benzoylated 1,5-anhydroribitol. Carbohydr Res 329:189-94
Elvebak 2nd, L E; McNally, P; Gray, G R (1998) Authentic standards for the reductive-cleavage method: the positional isomers of partially methylated and acetylated or benzoylated 1,5-anhydro-L-arabinitol. Carbohydr Res 313:181-7
Rozanas, C R; Gray, G R (1997) Reductive cleavage of the positional isomers of benzoylated and methylated methyl alpha-D-mannopyranoside. Carbohydr Res 298:243-9
Wang, N; Gray, G R (1997) Reductive cleavage of permethylated polysaccharides with borane-methyl sulfide complex and butyltin trichloride. Carbohydr Res 298:131-7
Li, Y; Gray, G R (1996) Structural identification of a major mitogenic lipid derived from Bacillus subtilis as a glycerophosphoglycolipid. Biochemistry 35:16299-304
Ahn, Y M; Gray, G R (1996) Mechanism of anomerization of cyclohexyl 2-deoxy-3,4,6-tri-O-methyl-2-(N-methylacetamido)-alpha- and beta-D-hexopyranosides under reductive-cleavage conditions. Carbohydr Res 296:215-27
Rozanas, C R; Wang, N; Vidlock, K et al. (1995) Synthesis and characterization of authentic standards for the analysis of ribofuranose-containing carbohydrates by the reductive-cleavage method. Carbohydr Res 274:99-110

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