Elicitin
beta-cinnamomin in complex with ergosterol
Identifiers
SymbolElicitin
PfamPF00964
InterProIPR002200
SCOP21beo / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

In molecular biology, elicitins are a family of small, highly conserved proteins secreted by phytopathogenic microorganisms belonging to the Phytophthora and Pythium species.[1] They are toxic proteins responsible for inducing a necrotic and systemic hypersensitive response in plants from the Solanaceae and Cruciferae families. Leaf necrosis provides immediate control of fungal invasion and induces systemic acquired resistance; both responses mediate basic protection against subsequent pathogen inoculation.

Members of this family share a high level of sequence similarity, but they differ in net charge, dividing them into two classes: alpha and beta.[1] Alpha-elicitins are highly acidic, with a valine residue at position 13, whereas beta-elicitins are basic, with a lysine at the same position. Residue 13 is known to be involved in the control of necrosis and, being exposed, is thought to be involved in ligand/receptor binding.[2] Phenotypically, the two classes can be distinguished by their necrotic properties: beta-elicitins are 100-fold more toxic and provide better subsequent protection.[1]

References

  1. 1 2 3 Yu LM (May 1995). "Elicitins from Phytophthora and basic resistance in tobacco". Proc. Natl. Acad. Sci. U.S.A. 92 (10): 4088–94. Bibcode:1995PNAS...92.4088Y. doi:10.1073/pnas.92.10.4088. PMC 41891. PMID 7753775.
  2. Fefeu S, Bouaziz S, Huet JC, Pernollet JC, Guittet E (November 1997). "Three-dimensional solution structure of beta cryptogein, a beta elicitin secreted by a phytopathogenic fungus Phytophthora cryptogea". Protein Sci. 6 (11): 2279–84. doi:10.1002/pro.5560061101. PMC 2143581. PMID 9385630.
This article incorporates text from the public domain Pfam and InterPro: IPR002200
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