title: Adjacent codon-anticodon interactions of both tRNAs present at the ribosomal A and P or P and E sites.
abstract: A labeled tRNA present at the A, P or E site can be partially chased from the ribosome, a cognate nonlabeled tRNA as chasing substrate being 3-12-times more efficient than non-cognate tRNA at a molar ratio tRNA: 70 S = 10:1. These findings indicate that a tRNA bound to a programmed ribosome undergoes codon-anticodon interaction at all three sites (A, P and E site). Furthermore, both labeled tRNA present on the ribosome can be chased more effectively with cognate than with non-cognate substrate at the same time. This finding provides strong evidence that both tRNAs present on the ribosome exhibit simultaneous codon-anticodon interaction. This is valid for both the pretranslocational state (Ac[3H]Lys-tRNALys in the A and [14C]tRNALys in the P site) as well as the posttranslocational state (Ac[3H]Lys-tRNALys in the P and [14C]tRNALys in the E site).
mesh_terms: D000926:Anticodon; D001665:Binding Sites; D003062:Codon; D004926:Escherichia coli / Q000235:genetics; D012333:RNA, Messenger; D012343:RNA, Transfer / Q000378:metabolism*; D012346:RNA, Transfer, Amino Acyl / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism*
chemical_list: D000926:Anticodon; D003062:Codon; D012333:RNA, Messenger; D012346:RNA, Transfer, Amino Acyl; D012343:RNA, Transfer