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Related Experiment Videos

Nuclear polyadenylation factors recognize cytoplasmic polyadenylation elements

A Bilger1, C A Fox, E Wahle

  • 1Department of Biochemistry, College of Agriculture and Life Sciences, University of Wisconsin, Madison 53706.

Genes & Development
|May 1, 1994
PubMed
Summary
This summary is machine-generated.

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Polyadenylation activates mRNA translation in oocytes. Nuclear and cytoplasmic polyadenylation share identical factors, including cleavage and polyadenylation specificity factor (CPSF) and poly(A) polymerase (PAP), suggesting a conserved mechanism.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • RNA Biology

Background:

  • Polyadenylation of mRNA in the cytoplasm activates translation in oocytes and early embryos.
  • Nuclear polyadenylation is crucial for mRNA processing and involves specific sequence elements and protein factors.

Purpose of the Study:

  • To investigate whether cytoplasmic and nuclear polyadenylation share common trans-acting factors.
  • To elucidate the sequence specificity and regulatory mechanisms of polyadenylation in different cellular compartments.

Main Methods:

  • Purification of cleavage and polyadenylation specificity factor (CPSF) and poly(A) polymerase (PAP) from calf thymus.
  • Assaying polyadenylation activity using RNA substrates with varying sequence elements.
  • Comparing polyadenylation specificity in nuclear and cytoplasmic extracts from frog oocytes.

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Main Results:

  • Purified CPSF and PAP exhibit sequence specificity similar to cytoplasmic polyadenylation, requiring both AAUAAA and a proximal U-rich sequence.
  • U-rich sequences enhance polyadenylation by increasing RNA affinity for CPSF.
  • Dilute frog nuclear polyadenylation factors display cytoplasmic sequence specificity, suggesting concentration-dependent regulation.

Conclusions:

  • Nuclear and cytoplasmic polyadenylation likely involve identical core factors, CPSF and PAP.
  • Differences in factor concentrations between the nucleus and cytoplasm may explain distinct sequence specificities.
  • The onset of polyadenylation during early development could be regulated by CPSF availability.