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Nucleic Acids Research, 1987, Vol. 15, No. 20 8417-8438
© 1987

Articles

Characterization of the effects on ovalbumin mRNA of aminomethyltrimethylpsoralen photoreaction with ben oviduct mRNA

Charles D. Liarakos, Gregory Reinhart1, Randall A. Kopper2 and Randolph P. Maddox

Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences Little Rock, AR 72205 1Department of Chemistry, University of Oklahoma Norman, OK 73019 2Department of Chemistry, Hendrix College Conway, AR 72032, USA

Received March 18, 1987. Revised September 14, 1987. Accepted September 14, 1987.

We have described the reaction of 4'-amlnomethyl-4, 5', 8-trimethylpsoralen (AMT) with hen oviduct mRNA and have investigated the specific effects of AMT photoaddition on ovalbumin mRNA which constitutes 60–70% of oviduct mRNA. The photoreaction of AMT with hen oviduct mRNA appeared to occur in two phases - a rapid monoadditlon followed by a slower conversion of monoadducts to diadducts (i.e. crosslinking). Both nondenaturing and denaturing gel electrophoresis revealed a photoreaction time dependent Increase in ovalbumin mRNA electrophoretic mobility indicating the formation of a progressively more compact molecular structure. Identical analysis of photoreacted rabbit globin mRNA revealed no change in electrophoretic mobility suggesting that AMT was stabilizing the AU rich secondary structure of ovalbumin mRNA but having no similar effect on the relatively GC rich secondary structure of globin mRNA. Ovalbumin-speciflc DNA primer extension was used to demonstrate the selective and secondary structure specific photoaddition of AMT to uracll bases at the 5' end of ovalbumin mRNA.


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