Breaking the Code of Polyadenylation-Induced Translation

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Breaking the Code of Polyadenylation-Induced Translation Joel D. Richter  Cell  Volume 132, Issue 3, Pages 335-337 (February 2008) DOI: 10.1016/j.cell.2008.01.024 Copyright © 2008 Elsevier Inc. Terms and Conditions

Figure 1 cis Elements Controlling Polyadenylation and Translation of Maternal mRNAs One model for repression and activation of mRNA polyadenylation and translation in Xenopus oocytes. This mRNA contains two cytoplasmic polyadenylation elements (CPEs), each bound by CPE-binding protein (CPEB), and one Pumilio-binding element (PBE) bound by the Pumilio protein. In this example, one CPE overlaps with the polyadenylation hexanucleotide AAUAAA (HEX); CPEB could thus exclude the interaction of cleavage and polyadenylation specificity factor (CPSF) with HEX. The two CPEB proteins may be bound by Maskin, which in turn interacts with the cap binding factor eIF4E, thereby repressing translation. Following progesterone stimulation of Aurora A activity, both CPEB proteins are phosphorylated, which is soon followed by phosphorylation by cyclin-dependent kinase 1 (cdk1). These second modifications lead to ubiquitin-mediated destruction of CPEB. For some mRNAs the loss of CPEB binding allows CPSF to bind the HEX, which promotes subsequent mRNA polyadenylation. Although necessary, the precise function of CPSF in cytoplasmic polyadenylation is not clear. Cell 2008 132, 335-337DOI: (10.1016/j.cell.2008.01.024) Copyright © 2008 Elsevier Inc. Terms and Conditions