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Target specificity among canonical nuclear poly(A) polymerases in plants modulates organ growth and pathogen response
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| Zeitschriftentitel: | Proceedings of the National Academy of Sciences |
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| Personen und Körperschaften: | , , , , , , , , , , , |
| In: | Proceedings of the National Academy of Sciences, 110, 2013, 34, S. 13994-13999 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Proceedings of the National Academy of Sciences
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| Schlagwörter: |
| Zusammenfassung: | <jats:p> Polyadenylation of pre-mRNAs is critical for efficient nuclear export, stability, and translation of the mature mRNAs, and thus for gene expression. The bulk of pre-mRNAs are processed by canonical nuclear poly(A) polymerase (PAPS). Both vertebrate and higher-plant genomes encode more than one isoform of this enzyme, and these are coexpressed in different tissues. However, in neither case is it known whether the isoforms fulfill different functions or polyadenylate distinct subsets of pre-mRNAs. Here we show that the three canonical nuclear PAPS isoforms in <jats:italic>Arabidopsis</jats:italic> are functionally specialized owing to their evolutionarily divergent C-terminal domains. A strong loss-of-function mutation in <jats:italic>PAPS1</jats:italic> causes a male gametophytic defect, whereas a weak allele leads to reduced leaf growth that results in part from a constitutive pathogen response. By contrast, plants lacking both <jats:italic>PAPS2</jats:italic> and <jats:italic>PAPS4</jats:italic> function are viable with wild-type leaf growth. Polyadenylation of <jats:italic>SMALL AUXIN UP RNA</jats:italic> ( <jats:italic>SAUR</jats:italic> ) mRNAs depends specifically on <jats:italic>PAPS1</jats:italic> function. The resulting reduction in <jats:italic>SAUR</jats:italic> activity in <jats:italic>paps1</jats:italic> mutants contributes to their reduced leaf growth, providing a causal link between polyadenylation of specific pre-mRNAs by a particular PAPS isoform and plant growth. This suggests the existence of an additional layer of regulation in plant and possibly vertebrate gene expression, whereby the relative activities of canonical nuclear PAPS isoforms control de novo synthesized poly(A) tail length and hence expression of specific subsets of mRNAs. </jats:p> |
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| Umfang: | 13994-13999 |
| ISSN: |
1091-6490
0027-8424 |
| DOI: | 10.1073/pnas.1303967110 |