these results , in conjunction with our previous report ( i. schwartz and j ofengand ( 1974 ) , proc . natl . acad . sci . u.s.a. 71 , 3951 ) which showed that covalent linking of this same trna derivative at the ribosomal p site resulted in attachment solely to the 16s rna , demonstrate that 16s , but not 23s or 5s rrna , is an important component of the trna binding site in the region of the 4-thiouridine residue and furthermore show that ribosomal a and p sites are topologically distinct .
C0035668
rna
C0035701
rrna