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Nucleic Acids Research, 1980, Vol. 8, No. 23 5685-5701
© 1980

MOLECULAR BIOLOGY

Proteins crosslinked to messenger RNA by irradiating polyribosomes with ultraviolet light

Jay R. Greenberg

The Worcester Foundation for Experimental Biology 222 Maple Avenue, Shrewsbury, MA 01545, USA

Received August 28, 1980. A set of proteins crosslinked to L-cell mRNA by irradiating polyribosomes with 254 nm ultraviolet light has been identified. 35S-methionine-labeled crosslinked mRNA-protein complexes were isolated by chromatography on oligo(dT)-cellulose under conditions that prevented non-covalent binding of proteins to RNA and to the column. After enzymatic removal of the RNA the proteins were analyzed in sodium dodecylsulfate/polyacrylamide gels. Six proteins having molecular weights of 98,000, 78,000, 75,000, 68,000, 62,000, and 52,000 were crosslinked to mRNA whether intact polyribosomes or EDTA-released mRNA-protein complexes were irradiated. Digestions with specific RNAases and chromatography on oligo(dT)-cellulose were used to show that a protein of 78,000 daltons was the only one crosslinked to poly(A), and the other proteins were crosslinked to sequences other than poly(A). However, a 78,000 dalton protein was also crosslinked to a sequence other than poly(A).


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