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Pyrophosphate modulates plant stress responses via SUMOylation.


ABSTRACT: Pyrophosphate (PPi), a byproduct of macromolecule biosynthesis is maintained at low levels by soluble inorganic pyrophosphatases (sPPase) found in all eukaryotes. In plants, H+-pumping pyrophosphatases (H+-PPase) convert the substantial energy present in PPi into an electrochemical gradient. We show here, that both cold- and heat stress sensitivity of fugu5 mutants lacking the major H+-PPase isoform AVP1 is correlated with reduced SUMOylation. In addition, we show that increased PPi concentrations interfere with SUMOylation in yeast and we provide evidence that SUMO activating E1-enzymes are inhibited by micromolar concentrations of PPi in a non-competitive manner. Taken together, our results do not only provide a mechanistic explanation for the beneficial effects of AVP1 overexpression in plants but they also highlight PPi as an important integrator of metabolism and stress tolerance.

SUBMITTER: Patir-Nebioglu MG 

PROVIDER: S-EPMC6382351 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Pyrophosphate (PPi), a byproduct of macromolecule biosynthesis is maintained at low levels by soluble inorganic pyrophosphatases (sPPase) found in all eukaryotes. In plants, H<sup>+</sup>-pumping pyrophosphatases (H<sup>+</sup>-PPase) convert the substantial energy present in PPi into an electrochemical gradient. We show here, that both cold- and heat stress sensitivity of <i>fugu5</i> mutants lacking the major H<sup>+</sup>-PPase isoform AVP1 is correlated with reduced SUMOylation. In addition,  ...[more]

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