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. 1987 Jan;7(1):495–503. doi: 10.1128/mcb.7.1.495

Requirements for accurate and efficient mRNA 3' end cleavage and polyadenylation of a simian virus 40 early pre-RNA in vitro.

L C Ryner, J L Manley
PMCID: PMC365093  PMID: 3031477

Abstract

Using a pre-RNA containing the simian virus 40 early introns and poly(A) addition site, we investigated several possible requirements for accurate and efficient mRNA 3' end cleavage and polyadenylation in a HeLa cell nuclear extract. Splicing and 3' end formation occurred under the same conditions but did not appear to be coupled in any way in vitro. Like splicing, 3' end cleavage and polyadenylation each required Mg2+, although spermidine could substitute in the cleavage reaction. Additionally, cleavage of this pre-RNA, but not others, was totally blocked by EDTA, indicating that structural features of pre-RNA may affect the ionic requirements of 3' end formation. The ATP analog 3' dATP inhibited both cleavage and polyadenylation even in the presence of ATP, possibly reflecting the coupled nature of these activities. A 5' cap structure appears not to be required for mRNA 3' end processing in vitro because neither the presence or absence of a 5' cap on the pre-RNA nor the addition of cap analogs to reaction mixtures had any effect on the efficiency of 3' end processing. Micrococcal nuclease pretreatment of the nuclear extract inhibited cleavage and polyadenylation. However, restoration of activity was achieved by addition of purified Escherichia coli RNA, suggesting that the inhibition caused by such a nuclease treatment was due to a general requirement for mass of RNA rather than to destruction of a particular nucleic acid-containing component such as a small nuclear ribonucleoprotein.

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