UMass Chan Medical School Faculty Publications

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Program in Molecular Medicine

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Animals; Female; HEK293 Cells; Humans; Oocytes; Peptidylprolyl Isomerase; Phosphorylation; Progesterone; Transcription Factors; Xenopus Proteins; mRNA Cleavage and Polyadenylation Factors


Amino Acids, Peptides, and Proteins | Cell Biology | Molecular Biology | Molecular Genetics | Nucleic Acids, Nucleotides, and Nucleosides


Cytoplasmic polyadenylation is a conserved mechanism that controls mRNA translation and stability. A key protein that promotes polyadenylation-induced translation of mRNAs in maturing Xenopus oocytes is the cytoplasmic polyadenylation element binding protein (CPEB). During this meiotic transition, CPEB is subjected to phosphorylation-dependent ubiquitination and partial destruction, which is necessary for successive waves of polyadenylation of distinct mRNAs. Here we identify the peptidyl-prolyl cis-trans isomerase Pin1 as an important factor mediating CPEB destruction. Pin1 interacts with CPEB in an unusual manner in which it occurs prior to CPEB phosphorylation and prior to Pin1 activation by serine 71 dephosphorylation. Upon induction of maturation, CPEB becomes phosphorylated, which occurs simultaneously with Pin1 dephosphorylation. At this time, the CPEB-Pin1 interaction requires cdk1-catalyzed CPEB phosphorylation on S/T-P motifs. Subsequent CPEB ubiquitination and destruction are mediated by a conformational change induced by Pin1 isomerization of CPEB. Similar to M phase progression in maturing Xenopus oocytes, the destruction of CPEB during the mammalian cell cycle requires Pin1 as well. These data identify Pin1 as a new and essential factor regulating CPEB degradation.

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Mol Cell Biol. 2013 Jan;33(1):48-58. doi: 10.1128/MCB.00904-12. Epub 2012 Oct 22. Link to article on publisher's site

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Molecular and cellular biology

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