6DTL

Mitogen-activated protein kinase 6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Bipartite anchoring of SCREAM enforces stomatal initiation by coupling MAP kinases to SPEECHLESS.

Putarjunan, A.Ruble, J.Srivastava, A.Zhao, C.Rychel, A.L.Hofstetter, A.K.Tang, X.Zhu, J.K.Tama, F.Zheng, N.Torii, K.U.

(2019) Nat Plants 5: 742-754

  • DOI: 10.1038/s41477-019-0440-x
  • Primary Citation of Related Structures:  
    6DTL

  • PubMed Abstract: 
  • Cell fate in eukaryotes is controlled by mitogen-activated protein kinases (MAPKs) that translate external cues into cellular responses. In plants, two MAPKs-MPK3 and MPK6-regulate diverse processes of development, environmental response and immunity. However, the mechanism that bridges these shared signalling components with a specific target remains unresolved ...

    Cell fate in eukaryotes is controlled by mitogen-activated protein kinases (MAPKs) that translate external cues into cellular responses. In plants, two MAPKs-MPK3 and MPK6-regulate diverse processes of development, environmental response and immunity. However, the mechanism that bridges these shared signalling components with a specific target remains unresolved. Focusing on the development of stomata-epidermal valves that are essential for gas exchange and transpiration-here, we report that the basic helix-loop-helix protein SCREAM functions as a scaffold that recruits MPK3/6 to downregulate SPEECHLESS, a transcription factor that initiates stomatal cell lineages. SCREAM directly binds to MPK3/6 through an evolutionarily conserved, yet unconventional, bipartite motif. Mutations in this motif abrogate association, phosphorylation and degradation of SCREAM, unmask hidden non-redundancies between MPK3 and MPK6, and result in uncontrolled stomatal differentiation. Structural analyses of MPK6 with a resolution of 2.75 Å showed bipartite binding of SCREAM to MPK6 that is distinct from an upstream MAPKK. Our findings elucidate, at the atomic resolution, the mechanism that directly links extrinsic signals to transcriptional reprogramming during the establishment of stomatal cell fate, and highlight a unique substrate-binding mode adopted by plant MAPKs.


    Organizational Affiliation

    Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, Japan. ktorii@u.washington.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitogen-activated protein kinase 6A, B364Arabidopsis thalianaMutation(s): 0 
Gene Names: MPK6At2g43790F18O19.10
EC: 2.7.11.24
UniProt
Find proteins for Q39026 (Arabidopsis thaliana)
Explore Q39026 
Go to UniProtKB:  Q39026
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.589α = 90
b = 151.589β = 90
c = 85.991γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-06-17 
  • Released Date: 2019-05-15 
  • Deposition Author(s): Ruble, J.

Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-15
    Type: Initial release
  • Version 1.1: 2019-07-10
    Changes: Data collection, Database references
  • Version 1.2: 2019-07-24
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-20
    Changes: Author supporting evidence