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| | ==X-ray crystal structure of the PYL2-quinabactin-Hab1 ternary complex== | | ==X-ray crystal structure of the PYL2-quinabactin-Hab1 ternary complex== |
| - | <StructureSection load='4la7' size='340' side='right' caption='[[4la7]], [[Resolution|resolution]] 1.98Å' scene=''> | + | <StructureSection load='4la7' size='340' side='right'caption='[[4la7]], [[Resolution|resolution]] 1.98Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4la7]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LA7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4LA7 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4la7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LA7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LA7 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=A1O:QUINABACTIN'>A1O</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.98Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">At2g26040, PYL2, RCAR14, T19L18.15 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 Arabidopsis thaliana]), At1g72770, F28P22.4, HAB1, HAB1 (Residues 179-511), P2C-HA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 Arabidopsis thaliana])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1O:QUINABACTIN'>A1O</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoprotein_phosphatase Phosphoprotein phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.16 3.1.3.16] </span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4la7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4la7 OCA], [https://pdbe.org/4la7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4la7 RCSB], [https://www.ebi.ac.uk/pdbsum/4la7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4la7 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4la7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4la7 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4la7 RCSB], [http://www.ebi.ac.uk/pdbsum/4la7 PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PYL2_ARATH PYL2_ARATH]] Receptor for abscisic acid (ABA) required for ABA-mediated responses such as stomatal closure and germination inhibition. Inhibits the activity of group-A protein phosphatases type 2C (PP2Cs) when activated by ABA.<ref>PMID:19898420</ref> <ref>PMID:19893533</ref> [[http://www.uniprot.org/uniprot/P2C16_ARATH P2C16_ARATH]] Key component and repressor of the abscisic acid (ABA) signaling pathway that regulates numerous ABA responses, such as stomatal closure, seed germination and inhibition of vegetative growth. Confers enhanced sensitivity to drought.<ref>PMID:14731256</ref> <ref>PMID:16876791</ref> <ref>PMID:16798945</ref> <ref>PMID:19033529</ref> | + | [https://www.uniprot.org/uniprot/PYL2_ARATH PYL2_ARATH] Receptor for abscisic acid (ABA) required for ABA-mediated responses such as stomatal closure and germination inhibition. Inhibits the activity of group-A protein phosphatases type 2C (PP2Cs) when activated by ABA.<ref>PMID:19898420</ref> <ref>PMID:19893533</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 4la7" style="background-color:#fffaf0;"></div> |
| | | | |
| | ==See Also== | | ==See Also== |
| - | *[[PYR/PYL/RCAR family of ABA receptors|PYR/PYL/RCAR family of ABA receptors]] | + | *[[Abscisic acid receptor 3D structures|Abscisic acid receptor 3D structures]] |
| - | *[[Protein phosphatase|Protein phosphatase]] | + | *[[Protein phosphatase 3D structures|Protein phosphatase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Arabidopsis thaliana]] | | [[Category: Arabidopsis thaliana]] |
| - | [[Category: Phosphoprotein phosphatase]] | + | [[Category: Large Structures]] |
| - | [[Category: Cutler, S R]] | + | [[Category: Cutler SR]] |
| - | [[Category: Peterson, F C]] | + | [[Category: Peterson FC]] |
| - | [[Category: Volkman, B F]] | + | [[Category: Volkman BF]] |
| - | [[Category: Hab1]]
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| - | [[Category: Hydrolase-receptor-inhibitor complex]]
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| - | [[Category: Pp2c inhibition]]
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| - | [[Category: Pyl2]]
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| Structural highlights
Function
PYL2_ARATH Receptor for abscisic acid (ABA) required for ABA-mediated responses such as stomatal closure and germination inhibition. Inhibits the activity of group-A protein phosphatases type 2C (PP2Cs) when activated by ABA.[1] [2]
Publication Abstract from PubMed
Abscisic acid (ABA) is an essential molecule in plant abiotic stress responses. It binds to soluble pyrabactin resistance1/PYR1-like/regulatory component of ABA receptor receptors and stabilizes them in a conformation that inhibits clade A type II C protein phosphatases; this leads to downstream SnRK2 kinase activation and numerous cellular outputs. We previously described the synthetic naphthalene sulfonamide ABA agonist pyrabactin, which activates seed ABA responses but fails to trigger substantial responses in vegetative tissues in Arabidopsis thaliana. Here we describe quinabactin, a sulfonamide ABA agonist that preferentially activates dimeric ABA receptors and possesses ABA-like potency in vivo. In Arabidopsis, the transcriptional responses induced by quinabactin are highly correlated with those induced by ABA treatments. Quinabactin treatments elicit guard cell closure, suppress water loss, and promote drought tolerance in adult Arabidopsis and soybean plants. The effects of quinabactin are sufficiently similar to those of ABA that it is able to rescue multiple phenotypes observed in the ABA-deficient mutant aba2. Genetic analyses show that quinabactin's effects in vegetative tissues are primarily mediated by dimeric ABA receptors. A PYL2-quinabactin-HAB1 X-ray crystal structure solved at 1.98-A resolution shows that quinabactin forms a hydrogen bond with the receptor/PP2C "lock" hydrogen bond network, a structural feature absent in pyrabactin-receptor/PP2C complexes. Our results demonstrate that ABA receptors can be chemically controlled to enable plant protection against water stress and define the dimeric receptors as key targets for chemical modulation of vegetative ABA responses.
Activation of dimeric ABA receptors elicits guard cell closure, ABA-regulated gene expression, and drought tolerance.,Okamoto M, Peterson FC, Defries A, Park SY, Endo A, Nambara E, Volkman BF, Cutler SR Proc Natl Acad Sci U S A. 2013 Jul 16;110(29):12132-7. doi:, 10.1073/pnas.1305919110. Epub 2013 Jul 1. PMID:23818638[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Melcher K, Ng LM, Zhou XE, Soon FF, Xu Y, Suino-Powell KM, Park SY, Weiner JJ, Fujii H, Chinnusamy V, Kovach A, Li J, Wang Y, Li J, Peterson FC, Jensen DR, Yong EL, Volkman BF, Cutler SR, Zhu JK, Xu HE. A gate-latch-lock mechanism for hormone signalling by abscisic acid receptors. Nature. 2009 Dec 3;462(7273):602-8. PMID:19898420 doi:10.1038/nature08613
- ↑ Yin P, Fan H, Hao Q, Yuan X, Wu D, Pang Y, Yan C, Li W, Wang J, Yan N. Structural insights into the mechanism of abscisic acid signaling by PYL proteins. Nat Struct Mol Biol. 2009 Dec;16(12):1230-6. Epub 2009 Nov 5. PMID:19893533 doi:10.1038/nsmb.1730
- ↑ Okamoto M, Peterson FC, Defries A, Park SY, Endo A, Nambara E, Volkman BF, Cutler SR. Activation of dimeric ABA receptors elicits guard cell closure, ABA-regulated gene expression, and drought tolerance. Proc Natl Acad Sci U S A. 2013 Jul 16;110(29):12132-7. doi:, 10.1073/pnas.1305919110. Epub 2013 Jul 1. PMID:23818638 doi:10.1073/pnas.1305919110
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