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. 1978 Sep;5(9):3389–3407. doi: 10.1093/nar/5.9.3389

A photoaffinity labelling study of the messenger RNA-binding region of Escherichia coli ribosomes.

H Towbin, D Elson
PMCID: PMC342257  PMID: 360171

Abstract

A photoaffinity labelling study of the messenger RNA-binding region of E. coli ribosomes has been made, using oligoadenylic acids as mRNA analogs. The oligonucleotides, of chain length 6 to 8 and thus several nucleotides longer than oligonucleotides previously employed for this purpose, carried a radioactive photolabile aromatic azide reagent bound covalently to the 3'-terminal ribose moiety. The synthesis of the reagent, p-azidobenzoyl-(3H)-glycylhydrazide, is described. The derivatized oligonucleotides were shown to be functional messengers. They stimulated the binding of the cognate aminoacyl-tRNA, lysyl-tRNA: their binding was reciprocally stimulated by lysyl-tRNA; and they competed with underivatized oligoadenylates for ribosomal binding sites. When the 70 S ribosomal binding complex was irradiated, the photolabile reagent reacted covalently with both RNA and proteins of the 30 S subunit and with tRNA, but not with the 50 S subunit. The 16 S RNA appeared to be labelled at more than one site. Of the proteins, S3 and S5 reacted with the reagent with high specificity; and the possibility was not eliminated that S4 may have been labelled to a minor degree. Functional studies in other laboratories have implicated S3 and S5 in the decoding process, but these proteins were not labelled by any of the previously reported mRNA affinity labelling analogs. The results reported here therefore indicate that S3 and S5 not only affect the decoding process, but are located in the mRNA-binding region of the ribosome, presumably to the 3' side of the decoding site.

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Selected References

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