Protein Information

Name OST1
Synonyms Dolichyl diphosphooligosaccharide protein glycosyltransferase 67 kDa subunit; Dolichyl diphosphooligosaccharide protein glycosyltransferase 67 kDa subunit; Dolichyl diphosphooligosaccharide protein glycosyltransferase 67 kDa subunit precursor; OST 1; OST1; RBPH 1; RBPH1; RPN 1…

Compound Information

Name abscisic acid
CAS

Reference List

PubMed Abstract RScore(About this table)
19924127 Fujii H, Chinnusamy V, Rodrigues A, Rubio S, Antoni R, Park SY, Cutler SR, Sheen J, Rodriguez PL, Zhu JK: In vitro reconstitution of an abscisic acid signalling pathway. Nature. 2009 Dec 3;462(7273):660-4. Epub 2009 Nov 18.

Here we show that by combining the recently identified ABA receptor PYR1 with the type 2C protein phosphatase (PP2C) ABI1, the serine/threonine protein kinase SnRK2.6/OST1 and the transcription factor ABF2/AREB1, we can reconstitute ABA-triggered phosphorylation of the transcription factor in vitro.
1(0,0,0,1) Details
19420218 Fujii H, Zhu JK: Arabidopsis mutant deficient in 3 abscisic acid-activated protein kinases reveals critical roles in growth, reproduction, and stress. Proc Natl Acad Sci U S A. 2009 May 19;106(20):8380-5. Epub 2009 May 6.

These SnRK2s, SnRK2.2, SnRK2.3, and SnRK2.6 (also known as OST1), are activated by ABA and can phosphorylate the ABA-responsive element binding factor family of b-ZIP transcription factors, which are important for the activation of ABA-responsive genes.
1(0,0,0,1) Details
19785574 Sato A, Sato Y, Fukao Y, Fujiwara M, Umezawa T, Shinozaki K, Hibi T, Taniguchi M, Miyake H, Goto DB, Uozumi N: Threonine at position 306 of the KAT1 potassium channel is essential for channel activity and is a target site for ABA-activated SnRK2/OST1/SnRK2.6 protein kinase. Biochem J. 2009 Dec 10;424(3):439-48.

In the present study, we have demonstrated that the C-terminal region of KAT1 acts as a phosphorylation target for the Arabidopsis calcium-independent ABA (abscisic acid)-activated protein kinase SnRK2.6 (Snf1-related protein kinase 2.6).
1(0,0,0,1) Details
19181866 Sirichandra C, Wasilewska A, Vlad F, Valon C, Leung J: The guard cell as a single-cell model towards understanding drought tolerance and abscisic acid action. J Exp Bot. 2009;60(5):1439-63. Epub 2009 Jan 30.

Indeed, the first regulatory enzymes underpinning these transport processes revealed genetically were several protein phosphatases of the 2C class and the OST1 kinase, a member of the SnRK2 family.
1(0,0,0,1) Details
15064385 Suhita D, Raghavendra AS, Kwak JM, Vavasseur A: Cytoplasmic alkalization precedes reactive oxygen species production during methyl jasmonate- and abscisic acid-induced stomatal closure. Plant Physiol. 2004 Apr;134(4):1536-45. Epub 2004 Apr 2.

Our results further indicate that JAR1, as OST1, functions upstream of ROS produced by NAD (P) H oxidases and that the cytoplasmic alkalization precedes ROS production during MJ or ABA signal transduction in guard cells.
1(0,0,0,1) Details
16959575 Melotto M, Underwood W, Koczan J, Nomura K, He SY: Plant stomata function in innate immunity against bacterial invasion. Cell. 2006 Sep 8;126(5):969-80.


Stomatal guard cells of Arabidopsis perceive bacterial surface molecules, which requires the FLS2 receptor, production of nitric oxide, and the guard-cell-specific OST1 kinase.
1(0,0,0,1) Details
16365038 Yoshida R, Umezawa T, Mizoguchi T, Takahashi S, Takahashi F, Shinozaki K: The regulatory domain of SRK2E/OST1/SnRK2.6 interacts with ABI1 and integrates abscisic acid (ABA) and osmotic stress signals controlling stomatal closure in Arabidopsis. J Biol Chem. 2006 Feb 24;281(8):5310-8. Epub 2005 Dec 19.
87(1,1,1,7) Details
19855047 Vlad F, Rubio S, Rodrigues A, Sirichandra C, Belin C, Robert N, Leung J, Rodriguez PL, Lauriere C, Merlot S: Protein phosphatases 2C regulate the activation of the Snf1-related kinase OST1 by abscisic acid in Arabidopsis. Plant Cell. 2009 Oct;21(10):3170-84. Epub 2009 Oct 23.
35(0,1,1,5) Details
19716822 Sirichandra C, Gu D, Hu HC, Davanture M, Lee S, Djaoui M, Valot B, Zivy M, Leung J, Merlot S, Kwak JM: Phosphorylation of the Arabidopsis AtrbohF NADPH oxidase by OST1 protein kinase. FEBS Lett. 2009 Sep 17;583(18):2982-6. Epub 2009 Aug 29.

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.
6(0,0,0,6) Details
16766677 Belin C, de Franco PO, Bourbousse C, Chaignepain S, Schmitter JM, Vavasseur A, Giraudat J, Barbier-Brygoo H, Thomine S: Identification of features regulating OST1 kinase activity and OST1 function in guard cells. Plant Physiol. 2006 Aug;141(4):1316-27. Epub 2006 Jun 9.

The phytohormone abscisic acid (ABA) mediates drought responses in plants and, in particular, triggers stomatal closure.
6(0,0,0,6) Details
19955405 Geiger D, Scherzer S, Mumm P, Stange A, Marten I, Bauer H, Ache P, Matschi S, Liese A, Al-Rasheid KA, Romeis T, Hedrich R: Activity of guard cell anion channel SLAC1 is controlled by drought-stress signaling kinase-phosphatase pair. Proc Natl Acad Sci U S A. 2009 Dec 15;106(50):21425-30. Epub 2009 Dec 2.

In response to drought stress the phytohormone ABA (abscisic acid) induces stomatal closure and, therein, activates guard cell anion channels in a calcium-dependent as well as-independent manner.
Two key components of the ABA signaling pathway are the protein kinase OST1 (open stomata 1) and the protein phosphatase ABI1 (ABA insensitive 1).
4(0,0,0,4) Details
20345603 Ache P, Bauer H, Kollist H, Al-Rasheid KA, Lautner S, Hartung W, Hedrich R: Stomatal action directly feeds back on leaf turgor: New insights into the regulation of the plant water status from non-invasive pressure probe measurements. Plant J. 2010 Mar 25.

Leaf turgor of wild type plants responded to CO (2), light, humidity, ozone and abscisic acid (ABA) in a guard cell-specific manner.
Under water stress the protein kinase OST1 activates the guard cell anion release channel SLAC1 and thereby triggers stomatal closure.
3(0,0,0,3) Details
19955427 Lee SC, Lan W, Buchanan BB, Luan S: A protein kinase-phosphatase pair interacts with an ion channel to regulate ABA signaling in plant guard cells. Proc Natl Acad Sci U S A. 2009 Dec 15;106(50):21419-24. Epub 2009 Dec 2.

The plant hormone abscisic acid (ABA) serves as a physiological monitor to assess the water status of plants and, under drought conditions, induces stomatal pore closure by activating specific ion channels, such as a slow-anion channel (SLAC1) that, in turn, mediate ion efflux from the guard cells.
Here we show that the OST1 kinase interacts with the SLAC1 anion channel, leading to its activation via phosphorylation.
2(0,0,0,2) Details
19541597 Nakashima K, Fujita Y, Kanamori N, Katagiri T, Umezawa T, Kidokoro S, Maruyama K, Yoshida T, Ishiyama K, Kobayashi M, Shinozaki K, Yamaguchi-Shinozaki K: Three Arabidopsis SnRK2 protein kinases, SRK2D/SnRK2.2, SRK2E/SnRK2.6/OST1 and SRK2I/SnRK2.3, involved in ABA signaling are essential for the control of seed development and dormancy. Plant Cell Physiol. 2009 Jul;50(7):1345-63. Epub 2009 Jun 18.

2(0,0,0,2) Details
16682349 Xie X, Wang Y, Williamson L, Holroyd GH, Tagliavia C, Murchie E, Theobald J, Knight MR, Davies WJ, Leyser HM, Hetherington AM: The identification of genes involved in the stomatal response to reduced atmospheric relative humidity. Curr Biol. 2006 May 9;16(9):882-7.


OST1 encodes a protein kinase involved in ABA-mediated stomatal closure while ABA2 encodes an enzyme involved in ABA biosynthesis.
2(0,0,0,2) Details
16828085 Riera M, Redko Y, Leung J: Arabidopsis RNA-binding protein UBA2a relocalizes into nuclear speckles in response to abscisic acid. FEBS Lett. 2006 Jul 24;580(17):4160-5. Epub 2006 Jun 30.

Our results showed that despite the resemblance between the corresponding Vicia and Arabidopsis proteins, it appears that the function of UBA2a is independent of OST1 phosphorylation.
1(0,0,0,1) Details
19874541 Nishimura N, Sarkeshik A, Nito K, Park SY, Wang A, Carvalho PC, Lee S, Caddell DF, Cutler SR, Chory J, Yates JR, Schroeder JI: PYR/PYL/RCAR family members are major in-vivo ABI1 protein phosphatase 2C-interacting proteins in Arabidopsis. Plant J. 2010 Jan;61(2):290-9. Epub 2009 Oct 26.

Abscisic acid (ABA) mediates resistance to abiotic stress and controls developmental processes in plants.
We confirm previous studies in yeast and now show that ABI1 interacts with the ABA-signalling kinases OST1, SnRK2.2 and SnRK2.3 in plants.
1(0,0,0,1) Details