2muk: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
==1H, 13C, and 15N Chemical Shift Assignments for AUX/IAA17== | ==1H, 13C, and 15N Chemical Shift Assignments for AUX/IAA17== | ||
<StructureSection load='2muk' size='340' side='right'caption='[[2muk | <StructureSection load='2muk' size='340' side='right'caption='[[2muk]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2muk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[2muk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MUK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2MUK FirstGlance]. <br> | ||
</td></tr> | </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=2muk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2muk OCA], [https://pdbe.org/2muk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2muk RCSB], [https://www.ebi.ac.uk/pdbsum/2muk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2muk ProSAT]</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=2muk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2muk OCA], [https://pdbe.org/2muk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2muk RCSB], [https://www.ebi.ac.uk/pdbsum/2muk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2muk ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/IAA17_ARATH IAA17_ARATH] | |||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
| Line 20: | Line 21: | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Arabidopsis thaliana]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Han | [[Category: Han M]] | ||
[[Category: Suh | [[Category: Suh J]] | ||
Revision as of 11:07, 8 March 2023
1H, 13C, and 15N Chemical Shift Assignments for AUX/IAA171H, 13C, and 15N Chemical Shift Assignments for AUX/IAA17
Structural highlights
FunctionPublication Abstract from PubMedAuxin is the central hormone that regulates plant growth and organ development. Transcriptional regulation by auxin is mediated by the auxin response factor (ARF) and the repressor, AUX/IAA. Aux/IAA associates with ARF via domain III-IV for transcriptional repression that is reversed by auxin-induced Aux/IAA degradation. It has been known that Aux/IAA and ARF form homo- and hetero-oligomers for the transcriptional regulation, but what determines their association states is poorly understood. Here we report, to our knowledge, the first solution structure of domain III-IV of Aux/IAA17 (IAA17), and characterize molecular interactions underlying the homotypic and heterotypic oligomerization. The structure exhibits a compact beta-grasp fold with a highly dynamic insert helix that is unique in Aux/IAA family proteins. IAA17 associates to form a heterogeneous ensemble of front-to-back oligomers in a concentration-dependent manner. IAA17 and ARF5 associate to form homo- or hetero-oligomers using a common scaffold and binding interfaces, but their affinities vary significantly. The equilibrium dissociation constants (KD) for homo-oligomerization are 6.6 muM and 0.87 muM for IAA17 and ARF5, respectively, whereas hetero-oligomerization reveals a approximately 10- to approximately 100-fold greater affinity (KD = 73 nM). Thus, individual homo-oligomers of IAA17 and ARF5 spontaneously exchange their subunits to form alternating hetero-oligomers for transcriptional repression. Oligomerization is mainly driven by electrostatic interactions, so that charge complementarity at the interface determines the binding affinity. Variable binding affinity by surface charge modulation may effectively regulate the complex interaction network between Aux/IAA and ARF family proteins required for the transcriptional control of auxin-response genes. Structural basis for the auxin-induced transcriptional regulation by Aux/IAA17.,Han M, Park Y, Kim I, Kim EH, Yu TK, Rhee S, Suh JY Proc Natl Acad Sci U S A. 2014 Dec 30;111(52):18613-8. doi:, 10.1073/pnas.1419525112. Epub 2014 Dec 15. PMID:25512488[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
|
| ||||||||||||||