View source for 4hrx


==Crystal structure of KAI2==
<StructureSection load='4hrx' size='340' side='right'caption='[[4hrx]], [[Resolution|resolution]] 2.11&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4hrx]] is a 1 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=4HRX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4HRX FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.11&#8491;</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=4hrx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4hrx OCA], [https://pdbe.org/4hrx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4hrx RCSB], [https://www.ebi.ac.uk/pdbsum/4hrx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4hrx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KAI2_ARATH KAI2_ARATH] Involved in seed germination and seedling development. Essential for plant responses to karrikins, a class of butenolide compounds, structurally similar to strigolactones, released from burning vegetation that stimulate seed germination and enhance seedling photomorphogenesis. KAI2 is not required for strigolactone-mediated responses, but MAX2 is necessary for responses to karrikins and strigolactones.<ref>PMID:20864454</ref> <ref>PMID:22357928</ref> <ref>PMID:23142794</ref> <ref>PMID:23301669</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
KARRIKIN INSENSITIVE 2 (KAI2) is an alpha/beta hydrolase involved in seed germination and seedling development. It is essential for plant responses to karrikins, a class of butenolide compounds derived from burnt plant material that are structurally similar to strigolactone plant hormones. The mechanistic basis for the function of KAI2 in plant development remains unclear. We have determined the crystal structure of Arabidopsis thaliana KAI2 in space groups P2(1) 2(1) 2(1) (a = 63.57 A, b = 66.26 A, c = 78.25 A) and P2(1) (a = 50.20 A, b = 56.04 A, c = 52.43 A, beta = 116.12 degrees ) to 1.55 and 2.11 A respectively. The catalytic residues are positioned within a large hydrophobic pocket similar to that of DAD2, a protein required for strigolactone response in Petunia hybrida. KAI2 possesses a second solvent-accessible pocket, adjacent to the active site cavity, which offers the possibility of allosteric regulation. The structure of KAI2 is consistent with its designation as a serine hydrolase, as well as previous data implicating the protein in karrikin and strigolactone signalling.

The Structure of the Karrikin-Insensitive Protein (KAI2) in Arabidopsis thaliana.,Bythell-Douglas R, Waters MT, Scaffidi A, Flematti GR, Smith SM, Bond CS PLoS One. 2013;8(1):e54758. doi: 10.1371/journal.pone.0054758. Epub 2013 Jan 18. PMID:23349965<ref>PMID:23349965</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4hrx" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Arabidopsis thaliana]]
[[Category: Large Structures]]
[[Category: Bond CS]]
[[Category: Bythell-Douglas R]]
[[Category: Flematti GR]]
[[Category: Scaffidi A]]
[[Category: Smith SM]]
[[Category: Waters MT]]