Plant elicitor peptide.

AtPep1 is an endogenous peptide elicitor from Arabidopsis leaves that signals the activation of components of the innate immune response against pathogens. Atpep1 derives from the carboxyl-terminalof the precursor propeptide PROPEP1, and on microbe-associated molecular pattern (MAMP) perception or cell damage, vacuolar membrane-resident PROPEP1 is processed by type II metacaspases to release AtPep1 which binds to the leucine-rich repeat receptor kinase (LLR-RK) PEPR1. AtPep1 binding to PEPR1 leads to heterodimerization with the shared receptor kinase Brassinosteroid-Insensitive 1-Associated Receptor Kinase 1 (BAK1) and consequent activation of the receptor complex, resulting in immune responses similar to those induced by pathogens.

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