4jym

From Proteopedia

(Difference between revisions)

Revision as of 21:36, 25 December 2014

crystal Structure of KAI2 in complex with 3-methyl-2H-furo[2,3-c]pyran-2-one

Structural highlights

4jym is a 2 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	4jyp
Gene:	F6G17.120, AT4g37470, At4g37470, AT4G37470 (Arabidopsis thaliana)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[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.^[1] ^[2] ^[3] ^[4]

Publication Abstract from PubMed

Genetic studies in Arabidopsis implicate an alpha/beta-hydrolase, KARRIKIN-INSENSITIVE 2 (KAI2) as a receptor for karrikins, germination-promoting butenolide small molecules found in the smoke of burned plants. However, direct biochemical evidence for the interaction between KAI2 and karrikin and for the mechanism of downstream signaling by a KAI2-karrikin complex remain elusive. We report crystallographic analyses and ligand-binding experiments for KAI2 recognition of karrikins. The karrikin-1 (KAR1) ligand sits in the opening to the active site abutting a helical domain insert but distal from the canonical catalytic triad (Ser95-His246-Asp217) of alpha/beta-hydrolases, consistent with the lack of detectable hydrolytic activity by purified KAI2. The closest approach of KAR1 to Ser95-His246-Asp217 is 3.8 A from His246. Six aromatic side chains, including His246, encapsulate KAR1 through geometrically defined aromatic-aromatic interactions. KAR1 binding induces a conformational change in KAI2 at the active site entrance. A crevice of hydrophobic residues linking the polar edge of KAR1 and the helical domain insert suggests that KAI2-KAR1 creates a contiguous interface for binding signaling partners in a ligand-dependent manner.

Smoke-derived karrikin perception by the alpha/beta-hydrolase KAI2 from Arabidopsis.,Guo Y, Zheng Z, La Clair JJ, Chory J, Noel JP Proc Natl Acad Sci U S A. 2013 Apr 23. PMID:23613584^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Sun XD, Ni M. HYPOSENSITIVE TO LIGHT, an alpha/beta fold protein, acts downstream of ELONGATED HYPOCOTYL 5 to regulate seedling de-etiolation. Mol Plant. 2011 Jan;4(1):116-26. doi: 10.1093/mp/ssq055. Epub 2010 Sep 23. PMID:20864454 doi:10.1093/mp/ssq055
↑ Waters MT, Nelson DC, Scaffidi A, Flematti GR, Sun YK, Dixon KW, Smith SM. Specialisation within the DWARF14 protein family confers distinct responses to karrikins and strigolactones in Arabidopsis. Development. 2012 Apr;139(7):1285-95. doi: 10.1242/dev.074567. Epub 2012 Feb 22. PMID:22357928 doi:10.1242/dev.074567
↑ Waters MT, Smith SM. KAI2- and MAX2-mediated responses to karrikins and strigolactones are largely independent of HY5 in Arabidopsis seedlings. Mol Plant. 2013 Jan;6(1):63-75. doi: 10.1093/mp/sss127. Epub 2012 Nov 9. PMID:23142794 doi:10.1093/mp/sss127
↑ Kagiyama M, Hirano Y, Mori T, Kim SY, Kyozuka J, Seto Y, Yamaguchi S, Hakoshima T. Structures of D14 and D14L in the strigolactone and karrikin signaling pathways. Genes Cells. 2013 Jan 10. doi: 10.1111/gtc.12025. PMID:23301669 doi:10.1111/gtc.12025
↑ Guo Y, Zheng Z, La Clair JJ, Chory J, Noel JP. Smoke-derived karrikin perception by the alpha/beta-hydrolase KAI2 from Arabidopsis. Proc Natl Acad Sci U S A. 2013 Apr 23. PMID:23613584 doi:10.1073/pnas.1306265110

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4jym"

@@ Line 8: / Line 8: @@
 <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=4jym FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4jym OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4jym RCSB], [http://www.ebi.ac.uk/pdbsum/4jym PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://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 ==

4jym

From Proteopedia

Revision as of 21:36, 25 December 2014

crystal Structure of KAI2 in complex with 3-methyl-2H-furo[2,3-c]pyran-2-one

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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