4MNA image
Deposition Date 2013-09-10
Release Date 2013-12-04
Last Version Date 2024-10-30
Entry Detail
PDB ID:
4MNA
Keywords:
Title:
Crystal structure of the free FLS2 ectodomains
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
4.00 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.25
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:LRR receptor-like serine/threonine-protein kinase FLS2
Gene (Uniprot):FLS2
Chain IDs:A
Chain Length:662
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Structural basis for flg22-induced activation of the Arabidopsis FLS2-BAK1 immune complex.
Science 342 624 628 (2013)
PMID: 24114786 DOI: 10.1126/science.1243825

Abstact

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.

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Primary Citation of related structures