Nucleic Acids Research, 1981, Vol. 9, No. 10 2387-2396
© 1981
MOLECULAR BIOLOGY |
Cross-linking of Met-tRNAf to eIF-2ß and to the ribosomal proteins S3a and S6 within the eukaryotic initiation complex, eIF-2-GMPPCP Met-tRNAf-small ribosomal subunit
Central Institute of Molecular Biology, Academy of Sciences of GDR 1115 Berlin-Buch, GDR *Department of Cell Physiology, The Wenner-Gren Institute, University of Stockholm S-l 13 45 Stockholm, Sweden
+To whom correspondence should be addressed
Received March 12, 1981. In the quaternary initiation complex, eIF-2-GMPPCP-Met-tRNAf-40S ribosomal subunit, the Met-tRNAf can be cross-linked to the B 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-p-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.
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