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AvrRps4 effector family processing and recognition in lettuce.

Quang-Minh Nguyen¹, Arya Bagus Boedi Iswanto¹, Geon Hui Son¹

¹Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Republic of Korea.

Molecular Plant Pathology

|May 26, 2022

Summary

This summary is machine-generated.

Pathogen effector processing and recognition are uncoupled in lettuce for the AvrRps4 family. Distinct structural requirements for effector perception were identified in lettuce for AvrRps4, HopK1, and XopO.

Keywords:

AvrRps4 XopO effector-triggered immunity hypersensitive response processing recognition

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Screening and Identification of RNA Silencing Suppressors from Secreted Effectors of Plant Pathogens

Screening and Identification of RNA Silencing Suppressors from Secreted Effectors of Plant Pathogens

Published on: February 3, 2020

Area of Science:

Plant-pathogen interactions
Molecular plant pathology
Plant immunity

Background:

Pathogen effector proteins facilitate host invasion but can be recognized, triggering plant immunity.
The effector AvrRps4 is processed into N-terminal (AvrRps4^N) and C-terminal (AvrRps4^C) parts, with different roles in immunity.
AvrRps4^N induces a hypersensitive response (HR) in lettuce, dependent on a specific arginine residue (R112).

Purpose of the Study:

To investigate the uncoupling of effector processing and recognition in lettuce for the AvrRps4 effector family.
To compare the recognition of AvrRps4 and its homologues (HopK1, XopO) by lettuce.
To determine the structural requirements for effector recognition in lettuce.

Main Methods:

Analysis of effector processing and hypersensitive response (HR) induction in lettuce.
Site-directed mutagenesis of conserved arginine residues in AvrRps4 homologues.
Comparative analysis of effector recognition across the AvrRps4 family.

Main Results:

Effector processing and recognition are uncoupled in lettuce for the AvrRps4 family.
AvrRps4^N induces HR in lettuce, requiring R112 for processing and HR induction.
Mutations in XopO (R111, E114) abolished HR, indicating distinct structural requirements for effector recognition compared to AvrRps4 and HopK1.

Conclusions:

Lettuce exhibits distinct mechanisms for recognizing different members of the AvrRps4 effector family.
Structural variations in effectors influence their perception and the subsequent plant immune response.
This study provides insights into the complex interplay of effector processing and recognition in plant immunity.