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FEBS Lett. 2009 Sep 17;583(18):2982-6. doi: 10.1016/j.febslet.2009.08.033. Epub 2009 Aug 29.

Phosphorylation of the Arabidopsis AtrbohF NADPH oxidase by OST1 protein kinase.

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Institut des Sciences du Végétal, Centre National de la Recherche Scientifique, UPR 2355, Gif-sur-Yvette, France.

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  • FEBS Lett. 2009 Oct 20;583(20):3375.


The plant hormone abscisic acid (ABA) triggers production of reactive oxygen species (ROS) in guard cells via the AtrbohD and AtrbohF NADPH oxidases, leading to stomatal closure. The ABA-activated SnRK2 protein kinase open stomata 1 (OST1) (SRK2E/SnRK2.6) acts upstream of ROS in guard cell ABA signaling. Here, we report that OST1 phosphorylates Ser13 and Ser174 on AtrbohF. In addition, substitution of Ser174 to Ala results in a approximately 40% reduction in the phosphorylation of AtrbohF by OST1. We also show that OST1 physically interacts with AtrbohF. These results provide biochemical evidence suggesting that OST1 regulates AtrbohF activity.

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