Open AccessCross-linking of mRNA to initiation factor eIF-3, 24 kDa cap binding protein and ribosomal proteins SI, S3/3a, S6 and S11 within the 48S pre-initiation complex
Author(s) -
Peter Westermann,
Odd Nygård
Publication year - 1984
Publication title -
nucleic acids research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 9.008
H-Index - 537
eISSN - 1362-4954
pISSN - 0305-1048
DOI - 10.1093/nar/12.23.8887
Subject(s) - biology , ribosomal protein , messenger rna , reticulocyte , microbiology and biotechnology , polysome , ribosomal rna , initiation factor , 30s , ribosome , eukaryotic initiation factor , eif4a , biochemistry , translation (biology) , rna , gene
Native small ribosomal subunits from rabbit reticulocytes contain all initiation factors necessary for the formation of the mRNA-containing 48S pre-initiation complex. The complex formed in the presence of Met-tRNAf and 125I-labelled globin mRNA was cross-linked with diepoxybutane, and the covalent mRNA-protein complexes were isolated under denaturating conditions. The proteins of the covalent complex were identified as the 110, 95 and 66/64 kDa subunits of eIF-3. In addition, the 24 kDa cap binding protein and the ribosomal proteins S1, S3/3a, S6 and S11 were found covalently linked to the mRNA. Ribosomal proteins S3/3a and S6 were also involved in the ribosomal mRNA-binding domain of reticulocyte polysomes.