Abstract
Amphomycin inhibits the incorporation of mannose from GDP-[ 14C]mannose and GlcNac from UDP-[ 3H]GlcNAc into lipid-linked saccharides by either a particulate or a solubilized enzyme fraction from pig aorta. The solubilized enzyme was much more sensitive to the antibiotic than was the particulate fraction with 50% inhibition being observed at 8–15 μg of amphomycin. Although the antibiotic inhibited mannose transfer from GDP-[ 14C]mannose into mannosyl-phosphoryl-dolichol, lipid-linked oligosaccharides and glycoprotein, the synthesis of mannosyl-phosphoryl-dolichol was much more sensitive to amphomycin. Amphomycin also inhibited the incorporation of mannose from GDP-[ 14C]mannose into mannosyl-phosphoryldecaprenol in particulate extracts of Mycobacterium smegmatis .
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