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. 1989 Nov 11;17(21):8767–8782. doi: 10.1093/nar/17.21.8767

Ribosomal proteins S7 and L1 are located close to the decoding site of E. coli ribosome--affinity labeling studies with modified tRNAs carrying photoreactive probes attached adjacent to the 3'-end of the anticodon.

J Podkowiński 1, P Górnicki 1
PMCID: PMC335042  PMID: 2685749

Abstract

Two photoreactive azidonitrophenyl probes have been attached to Yeast methionine elongator tRNA by chemical modification of the N6-(threoninocarbonyl)adenosine located next to the 3'-end of the anticodon. The maximum distance between the purine ring and the azido group estimated for the two probes is 16-17 and 23-24A, respectively. Binding and cross-linking of the uncharged, modified tRNAs to E. coli ribosomes have been studied with and without poly(A,U,G) as a message, under conditions directing uncharged tRNAs preferentially to the P-site. The modified tRNAs retain their binding activity and upon irradiation bind covalently to the ribosome with very high yields. Protein S7 is the major cross-linking target for both modified tRNAs, in the presence or absence of poly(A,U,G). Protein L1 and to a lesser extent proteins L33 and L27 have been found to be cross-linked with the short probe. Cross-linking to 168 rRNA reaches significant levels only in the absence of the message.

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Selected References

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