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Updated: Aug 2, 2026

Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
09:16

Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

Published on: May 3, 2014

Formation of mRNA 3' termini: stability and dissociation of a complex involving the AAUAAA sequence

D Zarkower, M Wickens

    The EMBO Journal
    |January 1, 1987
    PubMed

    Insights

    A conserved sequence in pre-mRNA forms a complex essential for 3' end processing in animal cells. This complex, crucial for cleavage and polyadenylation, can be stabilized to study its role in mRNA maturation.

    Area of Science:

    • Molecular Biology
    • RNA Processing
    • Gene Expression

    Background:

    • Messenger RNA (mRNA) 3' end formation in animal cells is a critical step in gene expression.
    • This process involves endonucleolytic cleavage of pre-mRNA followed by polyadenylation.
    • The conserved AAUAAA sequence within the pre-mRNA plays a recognized role in this process.

    Purpose of the Study:

    • To investigate the role of the AAUAAA sequence in the 3' end processing of mRNA.
    • To identify and characterize the factor that interacts with the AAUAAA sequence.
    • To elucidate the mechanism by which this complex regulates cleavage and polyadenylation.

    Main Methods:

    • In vitro cleavage and polyadenylation assays using crude nuclear extracts.
    • Analysis of complex formation between pre-mRNA sequences and nuclear factors.
    • Site-directed mutagenesis of the AAUAAA sequence to assess its impact on complex formation and cleavage.
    • Use of cordycepin to stabilize the complex for further study.

    Main Results:

    • The highly conserved AAUAAA sequence forms a complex with a nuclear factor during pre-mRNA cleavage.
    • This complex is essential for both endonucleolytic cleavage and subsequent polyadenylation.
    • Complex formation is dependent on the integrity of the AAUAAA sequence; mutations abolish complex formation and cleavage.
    • The complex, normally transient, can be stabilized by the addition of cordycepin to the cleaved RNA.
    • Dissociation of the complex post-polyadenylation allows for subsequent rounds of cleavage.

    Conclusions:

    • A specific nuclear factor forms a transient complex with the AAUAAA sequence, which is indispensable for mRNA 3' end cleavage and polyadenylation.
    • The stability and dissociation dynamics of this complex are key regulatory steps in the mRNA processing pathway.
    • Understanding this complex provides insights into the precise mechanisms governing mRNA maturation in animal cells.

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