Crystal structure of the LRR ectodomain of the receptor kinase SOBIR1 from Arabidopsis thaliana.

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

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Crystal structure of the leucine-rich repeat ectodomain of the plant immune receptor kinase SOBIR1.

Hohmann, U.Hothorn, M.

(2019) Acta Crystallogr D Struct Biol 75: 488-497

  • DOI: https://doi.org/10.1107/S2059798319005291
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Plant-unique membrane receptor kinases with leucine-rich repeat (LRR) extracellular domains are key regulators of development and immune responses. Here, the 1.55 Å resolution crystal structure of the immune receptor kinase SOBIR1 from Arabidopsis is presented. The ectodomain structure reveals the presence of five LRRs sandwiched between noncanonical capping domains. The disulfide-bond-stabilized N-terminal cap harbours an unusual β-hairpin structure. The C-terminal cap features a highly positively charged linear motif which was found to be largely disordered in this structure. Size-exclusion chromatography and right-angle light-scattering experiments suggest that SOBIR1 is a monomer in solution. The protruding β-hairpin, a set of highly conserved basic residues at the inner surface of the SOBIR LRR domain and the presence of a genetic missense allele in LRR2 together suggest that the SOBIR1 ectodomain may mediate protein-protein interaction in plant immune signalling.

  • Organizational Affiliation

    Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leucine-rich repeat receptor-like serine/threonine/tyrosine-protein kinase SOBIR1
A, B
300Arabidopsis thalianaMutation(s): 0 
Gene Names: SOBIR1EVRAt2g31880F20M17.8
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q9SKB2 (Arabidopsis thaliana)
Explore Q9SKB2 
Go to UniProtKB:  Q9SKB2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SKB2
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.246α = 90
b = 82.246β = 90
c = 109.863γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland31CP30_180213

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-08
    Type: Initial release
  • Version 1.1: 2019-05-15
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary