TY  - JOUR
A1  - Vi, Son Lang
A1  - Trost, Gerda
A1  - Lange, Peggy
A1  - Czesnick, Hjördis
A1  - Rao, Nishta
A1  - Lieber, Diana
A1  - Laux, Thomas
A1  - Gray, William M.
A1  - Manley, James L.
A1  - Groth, Detlef
A1  - Kappel, Christian
A1  - Lenhard, Michael
T1  - Target specificity among canonical nuclear poly(A) polymerases in plants
 modulates organ growth and pathogen response
JF  - PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
 AMERICA
N2  - 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 Arabidopsis are functionally specialized owing to their evolutionarily divergent C-terminal domains. A strong loss-of-function mutation in PAPS1 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 PAPS2 and PAPS4 function are viable with wild-type leaf growth. Polyadenylation of SMALL AUXIN UP RNA (SAUR) mRNAs depends specifically on PAPS1 function. The resulting reduction in SAUR activity in paps1 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.
Y1  - 2013
U6  - https://doi.org/10.1073/pnas.1303967110
SN  - 0027-8424
VL  - 110
IS  - 34
SP  - 13994
EP  - 13999
PB  - NATL ACAD SCIENCES
CY  - WASHINGTON
ER  -