Premium
Identification by RNA‐protein cross‐linking of ribosomal proteins located at the interface between the small and the large subunits of mammalian ribosomes.
Author(s) -
Nygård O.,
Nika H.
Publication year - 1982
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1982.tb01174.x
Subject(s) - ribosome , ribosomal rna , eukaryotic large ribosomal subunit , eukaryotic ribosome , ribosomal protein , biology , protein subunit , eukaryotic small ribosomal subunit , rna , microbiology and biotechnology , 30s , 5s ribosomal rna , biochemistry , gene
Protein constituents at the subunit interface of rat liver ribosomes were analysed by cross‐linking with the bifunctional reagent, diepoxybutane (distance between reactive groups 4 A). Isolated 40S and 60S subunits were labelled with 125I and recombined with unlabelled complementary subunits. The two kinds of selectively labelled 80S ribosomes were treated with diepoxybutane at low concentration. Radioactive ribosomal proteins covalently attached to the rRNA of the unlabelled complementary subparticles were isolated by repeated gradient centrifugation. The RNA‐bound, labelled proteins were identified by two‐dimensional gel electrophoresis. The experiments showed that proteins S2, S3, S4, S6, S7, S13, and S14 in the small subunit of rat liver ribosomes are located at the ribosomal interface in close proximity to 28S rRNA. Similarly, proteins L3, L6, L7, and L8 were found at the the interface of the large ribosomal subunit in the close vicinity of 18S rRNA.