Teaching an old dog new tricks: Suppressing activation of specific mitogen-activated kinases as a potential virulence function of the bacterial AvrRpt2 effector protein.
AvrRpt2 is one of the first Pseudomonas syringae effector proteins demonstrated to be delivered into host cells. It suppresses plant immunity by modulating auxin signaling and cleavage of the membrane-localized defense regulator RIN4. We recently uncovered a novel potential virulence function of AvrRpt2, where it specifically blocked activation of mitogen-activated protein kinases, MPK4 and MPK11, but not of MPK3 and MPK6. Putative AvrRpt2 homologs from different phytopathogens and plant-associated bacteria showed distinct activities with respect to MPK4/11 activation suppression and RIN4 cleavage. Apart from differences in sequence similarity, 3 of the analyzed homologs were apparently "truncated." To examine the role of the AvrRpt2 N-terminus, we modeled the structures of these AvrRpt2 homologs and performed deletion and domain swap experiments. Our results strengthen the finding that RIN4 cleavage is irrelevant for the ability to suppress defense-related MPK4/11 activation and indicate that full protease activity or cleavage specificity is affected by the N-terminus.
a Department of Stress & Developmental Biology , Leibniz Institute of Plant Biochemistry , Halle/Saale , Germany.
Lennart
L
Eschen-Lippold
a Department of Stress & Developmental Biology , Leibniz Institute of Plant Biochemistry , Halle/Saale , Germany.
Dierk
D
Scheel
a Department of Stress & Developmental Biology , Leibniz Institute of Plant Biochemistry , Halle/Saale , Germany.
Justin
J
Lee
D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D057056:Cysteine Proteases / Q000235:genetics / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism*; D057865:Plant Immunity / Q000235:genetics / Q000502:physiology; D044224:Pseudomonas syringae / Q000235:genetics / Q000378:metabolism / Q000472:pathogenicity; D014774:Virulence / Q000235:genetics / Q000502:physiology
D029681:Arabidopsis Proteins; D001426:Bacterial Proteins; D020928:Mitogen-Activated Protein Kinases; D057056:Cysteine Proteases
Arabidopsis thaliana; MAP kinase; PAMP-triggered immunity; Pseudomonas syringae; cysteine protease; defense