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4rqw

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Revision as of 07:04, 30 September 2015

Crystal structure of Myc3 N-terminal JAZ-binding domain [44-238] from Arabidopsis

Structural highlights

4rqw is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Related:	4rru
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[MYC3_ARATH] Transcription factor involved in tryptophan, jasmonic acid (JA) and other stress-responsive gene regulation. With MYC2 and MYC4, controls additively subsets of JA-dependent responses. Can form complexes with all known glucosinolate-related MYBs to regulate glucosinolate biosynthesis. Binds to the G-box (5'-CACGTG-3') of promoters. Activates multiple TIFY/JAZ promoters.^[1] ^[2] ^[3] ^[4] ^[5]

Publication Abstract from PubMed

The plant hormone jasmonate plays crucial roles in regulating plant responses to herbivorous insects and microbial pathogens and is an important regulator of plant growth and development. Key mediators of jasmonate signalling include MYC transcription factors, which are repressed by jasmonate ZIM-domain (JAZ) transcriptional repressors in the resting state. In the presence of active jasmonate, JAZ proteins function as jasmonate co-receptors by forming a hormone-dependent complex with COI1, the F-box subunit of an SCF-type ubiquitin E3 ligase. The hormone-dependent formation of the COI1-JAZ co-receptor complex leads to ubiquitination and proteasome-dependent degradation of JAZ repressors and release of MYC proteins from transcriptional repression. The mechanism by which JAZ proteins repress MYC transcription factors and how JAZ proteins switch between the repressor function in the absence of hormone and the co-receptor function in the presence of hormone remain enigmatic. Here we show that Arabidopsis MYC3 undergoes pronounced conformational changes when bound to the conserved Jas motif of the JAZ9 repressor. The Jas motif, previously shown to bind to hormone as a partly unwound helix, forms a complete alpha-helix that displaces the amino (N)-terminal helix of MYC3 and becomes an integral part of the MYC N-terminal fold. In this position, the Jas helix competitively inhibits MYC3 interaction with the MED25 subunit of the transcriptional Mediator complex. Our structural and functional studies elucidate a dynamic molecular switch mechanism that governs the repression and activation of a major plant hormone pathway.

Structural basis of JAZ repression of MYC transcription factors in jasmonate signalling.,Zhang F, Yao J, Ke J, Zhang L, Lam VQ, Xin XF, Zhou XE, Chen J, Brunzelle J, Griffin PR, Zhou M, Xu HE, Melcher K, He SY Nature. 2015 Aug 10. doi: 10.1038/nature14661. PMID:26258305^[6]

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

References

↑ Smolen GA, Pawlowski L, Wilensky SE, Bender J. Dominant alleles of the basic helix-loop-helix transcription factor ATR2 activate stress-responsive genes in Arabidopsis. Genetics. 2002 Jul;161(3):1235-46. PMID:12136026
↑ Cheng Z, Sun L, Qi T, Zhang B, Peng W, Liu Y, Xie D. The bHLH transcription factor MYC3 interacts with the Jasmonate ZIM-domain proteins to mediate jasmonate response in Arabidopsis. Mol Plant. 2011 Mar;4(2):279-88. doi: 10.1093/mp/ssq073. Epub 2011 Jan 17. PMID:21242320 doi:http://dx.doi.org/10.1093/mp/ssq073
↑ Niu Y, Figueroa P, Browse J. Characterization of JAZ-interacting bHLH transcription factors that regulate jasmonate responses in Arabidopsis. J Exp Bot. 2011 Mar;62(6):2143-54. doi: 10.1093/jxb/erq408. Epub 2011 Feb 14. PMID:21321051 doi:http://dx.doi.org/10.1093/jxb/erq408
↑ Fernandez-Calvo P, Chini A, Fernandez-Barbero G, Chico JM, Gimenez-Ibanez S, Geerinck J, Eeckhout D, Schweizer F, Godoy M, Franco-Zorrilla JM, Pauwels L, Witters E, Puga MI, Paz-Ares J, Goossens A, Reymond P, De Jaeger G, Solano R. The Arabidopsis bHLH transcription factors MYC3 and MYC4 are targets of JAZ repressors and act additively with MYC2 in the activation of jasmonate responses. Plant Cell. 2011 Feb;23(2):701-15. doi: 10.1105/tpc.110.080788. Epub 2011 Feb 18. PMID:21335373 doi:http://dx.doi.org/10.1105/tpc.110.080788
↑ Schweizer F, Fernandez-Calvo P, Zander M, Diez-Diaz M, Fonseca S, Glauser G, Lewsey MG, Ecker JR, Solano R, Reymond P. Arabidopsis basic helix-loop-helix transcription factors MYC2, MYC3, and MYC4 regulate glucosinolate biosynthesis, insect performance, and feeding behavior. Plant Cell. 2013 Aug;25(8):3117-32. doi: 10.1105/tpc.113.115139. Epub 2013 Aug, 13. PMID:23943862 doi:http://dx.doi.org/10.1105/tpc.113.115139
↑ Zhang F, Yao J, Ke J, Zhang L, Lam VQ, Xin XF, Zhou XE, Chen J, Brunzelle J, Griffin PR, Zhou M, Xu HE, Melcher K, He SY. Structural basis of JAZ repression of MYC transcription factors in jasmonate signalling. Nature. 2015 Aug 10. doi: 10.1038/nature14661. PMID:26258305 doi:http://dx.doi.org/10.1038/nature14661

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/4rqw"

@@ Line 6: / Line 6: @@
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4rru|4rru]]</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=4rqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4rqw OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4rqw RCSB], [http://www.ebi.ac.uk/pdbsum/4rqw PDBsum]</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=4rqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4rqw OCA], [http://pdbe.org/4rqw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4rqw RCSB], [http://www.ebi.ac.uk/pdbsum/4rqw PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 18: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4rqw" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4rqw

From Proteopedia

Revision as of 07:04, 30 September 2015

Crystal structure of Myc3 N-terminal JAZ-binding domain [44-238] from Arabidopsis

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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