Abstract
A highly convergent approach for the chemical synthesis of eight structurally related trisaccharides that contain 3 to 5 amino groups has been described. Fourier-transformation ion cyclotron resonance mass spectrometry (FT-ICR MS) has been employed to determine the dissociation constants (Kd) for the binding of the trisaccharides to a prototypical fragment of 16S ribosomal RNA. A compound that contained a 4,6-dideoxy-4-amino-beta-D-glucopyranoside moiety at C-3 displayed binding in the low micromolar range. It was found that small structural changes of the saccharides resulted in large differences in affinity. The described structure-activity relationship is expected to be valuable for the development of novel antibiotics that target rRNA.
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