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Nucleic Acids Research, 1977, Vol. 4, No. 1 229-240
© 1977


Articles

Heterogeneity of 5'-termini of nucleolar 45S, 32S and 28S RNA In mouse hepatoma

Ryo Kominami and Maasami Muramatsu

Department of Biochemistry, Tokushima University School of Medicine Tokushima, Japan

Received November 11, 1976. The 5'-termini of nucleolar 45S, 32S and 28S RNA's were analyzed by means of thin layer chromatography and Dowex-1column chromatography.

45S RNA did not bear a triphosphate at the 5'-terminus, but various monophosphates were found. 5'-termini of 32S and28S RNA's were also heterogeneous.

These resultsindicate that 45S molecules as isolated with the conventional procedure may not contain the primary transcript of the ribosomal gene, but a collection of large precursors with different degrees of processing at the 5'-terminus.The processing of the primary transcript may thus involve some unknown trimming processes at the 5'-terminus before the first major cleavage takes place.


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