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Radiolabelling of Mycobacterium avium oligosaccharide determinant and use in macrophage studies

Radiolabelling of Mycobacterium avium oligosaccharide determinant and use in macrophage studies

Journal of General Microbiology 135(7): 1875-1884

ISSN/ISBN: 0022-1287

PMID: 2482334

DOI: 10.1099/00221287-135-7-1875

Internal radiolabelling produces were used to radiolabel the oligosaccharide determinant of the glycopeptidolipids (GPL) from serovars 4 and 20 of the Mycobacterium avium complex. Mycobacteria were cultured in the presence of [6-3H]fucose, [2-3H]mannose or [methyl-3H]methionine, after which radiolabelled native lipid was extracted and distribution of radioactivity in native and deacetylated lipid was determined by thin-layer chromatographic methods. Incorporation of radiolabel was confirmed by examining acid hydrolysates of purified GPL for 3H-labelled sugars on cellulose thin-layer plates. Least incorporation of radiolabeled into GPL was observed with [6-3H]fucose, whereas better incorporation was obtained with [2-3H]mannose and [methyl-3H]methionine. Use of [methyl-3H]methionine resulted in the radiolabelling of the methylated sugars in both the oligosaccharide determinant and the 3,4-di-O-methylrhamnose located at the terminus of the peptide core. Use of [2-3H]mannose resulted in the incorporation of radioactivity into the oligosaccharide determinant as 2-O-methylfucose, found in the GPL of both serovars 4 and 20. GPL radiolabelled with [2-3H]mannose were subsequently examined in macrophages cultures and found to be relatively inert to degradation by those phagocytic cells. These results substantiate earlier findings with the GPL of serovar 20 and indicate that these myocbacterial components may play a role in pathogenesis.

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Accession: 018080650

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