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. 1991 Nov;173(21):7024–7028. doi: 10.1128/jb.173.21.7024-7028.1991

Fragments of the internal transcribed spacer 1 of pre-rRNA accumulate in Saccharomyces cerevisiae lacking 5'----3' exoribonuclease 1.

A Stevens 1, C L Hsu 1, K R Isham 1, F W Larimer 1
PMCID: PMC209060  PMID: 1938905

Abstract

The portion of the internal transcribed spacer 1 found on 20S pre-rRNA accumulates in Saccharomyces cerevisiae lacking 5'----3' exoribonuclease 1, showing that an endonucleolytic cleavage at the 3' terminus of 18S rRNA is involved in the 20S pre-rRNA to 18S mature rRNA conversion. Smaller fragments of the spacer sequence are also found. The exoribonuclease may be involved as a cytoplasmic RNase in the hydrolysis of the spacer.

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Selected References

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