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. 1980 Feb 25;8(4):889–903.

3'-terminal processing of ribosomal RNA precursors in mammalian cells.

H Hamada, R Kominami, M Muramatsu
PMCID: PMC327319  PMID: 7433119

Abstract

The 3'-terminal structures of ribosomal 28S RNA and its precursors from rat and mouse were analyzed by means of periodate oxidation followed by reduction with 3H-borohydride. 3'-terminal labeled nucleoside derivatives produced by RNase T2 digestion were determined by thin-layer chromatography and oligonucleotides generated by RNase T1 digestion were analyzed by DEAE-Sephadex chromatography. In the rat, the major 3'-terminal sequences of ribosomal 28S RNA, nucleolar 28S, 32S, 41S, and 45S RNAs were YGUoh, GZ2Uoh, GZ12Uoh, GZ2Uoh, and GZ7Goh, respectively, whereas in the mouse corresponding sequences were YGUoh, GZ1,2, or 3Uoh, Goh, Uoh and GZ 13Uoh, respectively. (Y: pyrimidine nucleoside, Z: any nucleoside other than guanosine) These results suggest that a "transcribed spacer" sequence is present at the 3'-terminus of the 45S pre-ribosomal RNA, which is gradually removed during the steps of processing.

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Selected References

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