4YZ6

Crystal Structure of Myc3[44-238] from Arabidopsis in complex with Jaz1 peptide [200-221]


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of JAZ repression of MYC transcription factors in jasmonate signalling.

Zhang, F.Yao, J.Ke, J.Zhang, L.Lam, V.Q.Xin, X.F.Zhou, X.E.Chen, J.Brunzelle, J.Griffin, P.R.Zhou, M.Xu, H.E.Melcher, K.He, S.Y.

(2015) Nature 525: 269-273

  • DOI: 10.1038/nature14661
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 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 transcriptio ...

    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 α-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.


    Organizational Affiliation

    Laboratory of Structural Sciences and Laboratory of Structural Biology and Biochemistry, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcription factor MYC3
A
195Arabidopsis thalianaMutation(s): 0 
Gene Names: MYC3 (ATR2, BHLH5, EN36)
Find proteins for Q9FIP9 (Arabidopsis thaliana)
Go to UniProtKB:  Q9FIP9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein TIFY 10A
B
22Arabidopsis thalianaMutation(s): 0 
Gene Names: TIFY10A (JAZ1)
Find proteins for Q9LMA8 (Arabidopsis thaliana)
Go to UniProtKB:  Q9LMA8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 86.209α = 90.00
b = 86.209β = 90.00
c = 59.360γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACrefinement
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01 GM102545
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01AI060761

Revision History 

  • Version 1.0: 2015-08-05
    Type: Initial release
  • Version 1.1: 2015-08-26
    Type: Database references
  • Version 1.2: 2015-09-23
    Type: Database references
  • Version 1.3: 2017-09-06
    Type: Author supporting evidence, Database references, Derived calculations