5LPW

Crystal structure of the apo-BRI1 kinase domain (865-1160)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.431 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structures of the phosphorylated BRI1 kinase domain and implications for brassinosteroid signal initiation.

Bojar, D.Martinez, J.Santiago, J.Rybin, V.Bayliss, R.Hothorn, M.

(2014) Plant J. 78: 31-43

  • DOI: 10.1111/tpj.12445
  • Primary Citation of Related Structures:  
  • Also Cited By: 5LPY

  • PubMed Abstract: 
  • Brassinosteroids, which control plant growth and development, are sensed by the membrane receptor kinase BRASSINOSTEROID INSENSITIVE 1 (BRI1). Brassinosteroid binding to the BRI1 leucine-rich repeat (LRR) domain induces heteromerisation with a SOMATI ...

    Brassinosteroids, which control plant growth and development, are sensed by the membrane receptor kinase BRASSINOSTEROID INSENSITIVE 1 (BRI1). Brassinosteroid binding to the BRI1 leucine-rich repeat (LRR) domain induces heteromerisation with a SOMATIC EMBRYOGENESIS RECEPTOR KINASE (SERK)-family co-receptor. This process allows the cytoplasmic kinase domains of BRI1 and SERK to interact, trans-phosphorylate and activate each other. Here we report crystal structures of the BRI1 kinase domain in its activated form and in complex with nucleotides. BRI1 has structural features reminiscent of both serine/threonine and tyrosine kinases, providing insight into the evolution of dual-specificity kinases in plants. Phosphorylation of Thr1039, Ser1042 and Ser1044 causes formation of a catalytically competent activation loop. Mapping previously identified serine/threonine and tyrosine phosphorylation sites onto the structure, we analyse their contribution to brassinosteroid signaling. The location of known genetic missense alleles provide detailed insight into the BRI1 kinase mechanism, while our analyses are inconsistent with a previously reported guanylate cyclase activity. We identify a protein interaction surface on the C-terminal lobe of the kinase and demonstrate that the isolated BRI1, SERK2 and SERK3 cytoplasmic segments form homodimers in solution and have a weak tendency to heteromerise. We propose a model in which heterodimerisation of the BRI1 and SERK ectodomains brings their cytoplasmic kinase domains in a catalytically competent arrangement, an interaction that can be modulated by the BRI1 inhibitor protein BKI1.


    Organizational Affiliation

    Structural Plant Biology Lab, Friedrich Miescher Laboratory of the Max Planck Society, Spemannstrasse 39, 72076, Tuebingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein BRASSINOSTEROID INSENSITIVE 1
A
296Arabidopsis thalianaMutation(s): 1 
Gene Names: BRI1
EC: 2.7.10.1, 2.7.11.1
Find proteins for O22476 (Arabidopsis thaliana)
Go to UniProtKB:  O22476
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A
L-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
A
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.431 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 
  • Space Group: P 62
Unit Cell:
Length (Å)Angle (°)
a = 116.137α = 90.00
b = 116.137β = 90.00
c = 50.295γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
XSCALEdata scaling
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-24
    Type: Initial release