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. 1980 Jul 25;8(14):3229–3246. doi: 10.1093/nar/8.14.3229

Ribosome binding by tRNAs with fluorescent labeled 3' termini.

B D Wells, C R Cantor
PMCID: PMC324366  PMID: 6160468

Abstract

Yeast and E. coli tRNAPhe samples were oxidized and labeled at the 3' end with dansyl hydrazine or fluorescein thiosemicarbazide. These tRNAs can bind to poly(U)-programmed E. coli 70S tight couple ribosomes in 25 mM magnesium at 8 degrees C. Two binding sites with binding constants of about 1 X 10(9) M-1 (P) and 3 X 10(7) M-1 (A) were determined for the yeast tRNAPhe derivatives. With E. coli tRNAPhe the A site affinity is similar to yeast tRNAPhe but the P site affinity is 5-fold weaker. Singlet-singlet energy transfer showd that the distance from the 3' end of tRNAPhe in the P site to a fluorescein derivative of erythromycin is 23 A. This supports in vitro studies suggesting that erythromycin binds near the peptide moiety of peptidyl tRNA. A distance of 34 A between the 3' ends of 2 tRNAs bound simulatneously on the ribosome was also measured. This long distance may mean that the deacylated fluorescent tRNA binds to the A site in an orientation like that in the stringent response rather than in protein synthesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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