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Cross-linking of Met-tRNAf to eIF-2 beta and to the ribosomal proteins S3a and S6 within the eukaryotic inhibition complex, eIF-2 .GMPPCP.Met-tRNAf.small ribosomal subunit.

In the quaternary initiation complex, eIF-2.GMPPCP.Met-tRNAf.40S ribosomal subunit, the Met-tRNAf can be cross-linked to the beta subunit of initiation factor eIF-2 as well as to ribosomal proteins S3a and S6 by treatment with the bifunctional reagent, diepoxybutane. Using 40S subunits, modified in advance with the heterobifunctional reagent, methyl-rho-azido-benzoylaminoacetimidate, Met-tRNAf is covalently bound to the same ribosomal proteins (S3a and S6) upon irradiation of the complex with ultraviolet light. Under both conditions proteins S3a and S6, together with a limited number of other ribosomal proteins, are covalently bound to 18S ribosomal RNA.