Botrytis-induced kinase 1 (BIK1) from Arabidopsis thaliana

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 

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This is version 1.2 of the entry. See complete history


The Receptor-like Cytoplasmic Kinase BIK1 Localizes to the Nucleus and Regulates Defense Hormone Expression during Plant Innate Immunity.

Lal, N.K.Nagalakshmi, U.Hurlburt, N.K.Flores, R.Bak, A.Sone, P.Ma, X.Song, G.Walley, J.Shan, L.He, P.Casteel, C.Fisher, A.J.Dinesh-Kumar, S.P.

(2018) Cell Host Microbe 23: 485-497.e5

  • DOI: https://doi.org/10.1016/j.chom.2018.03.010
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Plants employ cell-surface pattern recognition receptors (PRRs) to detect pathogens. Although phytohormones produced during PRR signaling play an essential role in innate immunity, a direct link between PRR activation and hormone regulation is unknown. EFR is a PRR that recognizes bacterial EF-Tu and activates immune signaling. Here we report that EFR regulates the phytohormone jasmonic acid (JA) through direct phosphorylation of a receptor-like cytoplasmic kinase, BIK1. The BIK1 structure revealed that the EFR-phosphorylated sites reside on a uniquely extended loop away from the BIK1 kinase core domain. Phosphomimetic mutations of these sites resulted in increased phytohormones and enhanced resistance to bacterial infections. In addition to its documented plasma membrane localization, BIK1 also localizes to the nucleus and interacts directly with WRKY transcription factors involved in the JA and salicylic acid (SA) regulation. These findings demonstrate the mechanistic basis of signal transduction from PRR to phytohormones, mediated through a PRR-BIK1-WRKY axis.

  • Organizational Affiliation

    Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA 95616, USA. Electronic address: nkrlal@ucdavis.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase BIK1
A, B
395Arabidopsis thalianaMutation(s): 0 
Gene Names: BIK1At2g39660F12L6.32F17A14.3
Find proteins for O48814 (Arabidopsis thaliana)
Explore O48814 
Go to UniProtKB:  O48814
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO48814
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEP
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.19α = 90
b = 72.09β = 108.41
c = 93.88γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-18
    Type: Initial release
  • Version 1.1: 2018-08-29
    Changes: Data collection, Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description