Kinetic studies of peptide bond formation. Effect of chloramphenicol

Abstract
There might be an undetermined order in the interaction of the substrates with the ribosomes in the reaction of CACCA-Leu-Ac with puromycin to form Ac-Leu-puromycin and CACCA (‘fragment reaction’). Km 0°=6×10-4 M for the puromycin · ribosome interaction. Chloramphenicol totally blocks the ‘fragment reaction’ as a consequence of a single interaction with the ribosome of Kd 0°=2.2×10-6 M. The inhibition by chloramphenicol of the ‘fragment reaction’ is mixed competitive for puromycin.

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