from the affinity labelling of 70 s ribosomes with a photoreactive derivative of phe-trnaphe bearing an arylazido group on guanine residues , it has been found that different sets of ribosomal proteins are labelled in the course of three successive steps of ef-tu-dependent binding of aminoacyl-trna derivative at the a-site .
C0035553
ribosomes
C0035552
ribosomal proteins