4MN8

Crystal structure of flg22 in complex with the FLS2 and BAK1 ectodomains


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.06 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.227 

wwPDB Validation 3D Report Full Report



Literature

Structural basis for flg22-induced activation of the Arabidopsis FLS2-BAK1 immune complex.

Sun, Y.Li, L.Macho, A.P.Han, Z.Hu, Z.Zipfel, C.Zhou, J.M.Chai, J.

(2013) Science 342: 624-628

  • DOI: 10.1126/science.1243825
  • Primary Citation of Related Structures:  
    4MNA, 4MN8

  • PubMed Abstract: 
  • Flagellin perception in Arabidopsis is through recognition of its highly conserved N-terminal epitope (flg22) by flagellin-sensitive 2 (FLS2). Flg22 binding induces FLS2 heteromerization with BRASSINOSTEROID INSENSITIVE 1-associated kinase 1 (BAK1) a ...

    Flagellin perception in Arabidopsis is through recognition of its highly conserved N-terminal epitope (flg22) by flagellin-sensitive 2 (FLS2). Flg22 binding induces FLS2 heteromerization with BRASSINOSTEROID INSENSITIVE 1-associated kinase 1 (BAK1) and their reciprocal activation followed by plant immunity. Here, we report the crystal structure of FLS2 and BAK1 ectodomains complexed with flg22 at 3.06 angstroms. A conserved and a nonconserved site from the inner surface of the FLS2 solenoid recognize the C- and N-terminal segment of flg22, respectively, without oligomerization or conformational changes in the FLS2 ectodomain. Besides directly interacting with FLS2, BAK1 acts as a co-receptor by recognizing the C terminus of the FLS2-bound flg22. Our data reveal the molecular mechanisms underlying FLS2-BAK1 complex recognition of flg22 and provide insight into the immune receptor complex activation.


    Organizational Affiliation

    School of Life Sciences, Tsinghua University, Beijing 100084, China, and Tsinghua-Peking Center for Life Sciences, Beijing 100084, China.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LRR receptor-like serine/threonine-protein kinase FLS2A782Arabidopsis thalianaMutation(s): 0 
Gene Names: FLS2At5g46330MPL12.13MPL12.8
EC: 2.7.11.1
Find proteins for Q9FL28 (Arabidopsis thaliana)
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Go to UniProtKB:  Q9FL28
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BRASSINOSTEROID INSENSITIVE 1-associated receptor kinase 1B226Arabidopsis thalianaMutation(s): 0 
Gene Names: BAK1ELGSERK3At4g33430F17M5.190
EC: 2.7.10.1 (PDB Primary Data), 2.7.11.1 (PDB Primary Data)
Find proteins for Q94F62 (Arabidopsis thaliana)
Explore Q94F62 
Go to UniProtKB:  Q94F62
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
flg22C22N/AMutation(s): 0 
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
2 N-Glycosylation
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
A
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.06 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.227 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.865α = 90
b = 113.683β = 90
c = 164.363γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-04
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary