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. 1982 Feb 25;10(4):1327–1334. doi: 10.1093/nar/10.4.1327

Specific interaction of one subunit of eukaryotic initiation factor eIF-3 with 18S ribosomal RNA within the binary complex, eIF-3 small ribosomal subunit, as shown by cross-linking experiments.

O Nygård, P Westermann
PMCID: PMC320528  PMID: 7071015

Abstract

Initiation factor eIF-3 from rat liver forms a binary complex with the small ribosomal subunit. Within this complex, 18S ribosomal RNA can be cross-linked to the 66 000 dalton subunit of eIF-3 by treating the complex with a short bifunctional reagent, diepoxybutane, with a distance of 4A between the reactive groups. In binary complexes containing eIF-3 premodified with the heterobifunctional reagent, methyl-p-azido-benzoylaminoacetimidate (10A), the 66 000 dalton subunit of eIF-3 became covalently bound to 18S rRNA after irradiation of the complex with ultraviolet light. The involvement of only one of the eight eIF-3 subunits in the formation of the covalent RNA-protein complexes indicates a highly specific interaction between 18S rRNA and eIF-3 at the attachment site of the factor on the 40S subunit.

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Selected References

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