HopA1 Effector from Pseudomonas syringae pv syringae Strain 61 Affects NMD Processes and Elicits Effector-Triggered Immunity

International Journal of Molecular Sciences

Sang Hee Kim¹  Daipayan Ghosh²  Saikat Bhattacharjee²  Shraddha K. Dahale²  Kishor D. Ingole²  Anup Chugani³ 

[1] Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research Center, Division of Life Science, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Korea;Laboratory of Signal Transduction and Plant Resistance, UNESCO-Regional Centre for Biotechnology (RCB), NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad 121 001, Haryana, India;MedGenome Labs Ltd., 3rd Floor, Narayana Nethralaya Building, Narayana Health City, 258/A, Bommasandra, Hosur Road, Bengaluru 560099, Karnataka, India;

关键词: effectors;    virulence;    PAMP-triggered immunity;    effector-triggered immunity;    alternative splicing;    nonsense-mediated decay;   

DOI  :  10.3390/ijms22147440

来源: DOAJ

【 摘 要 】

Pseudomonas syringae-secreted HopA1 effectors are important determinants in host range expansion and increased pathogenicity. Their recent acquisitions via horizontal gene transfer in several non-pathogenic Pseudomonas strains worldwide have caused alarming increase in their virulence capabilities. In Arabidopsis thaliana, RESISTANCE TO PSEUDOMONAS SYRINGAE 6 (RPS6) gene confers effector-triggered immunity (ETI) against HopA1_pss derived from P. syringae pv. syringae strain 61. Surprisingly, a closely related HopA1_pst from the tomato pathovar evades immune detection. These responsive differences in planta between the two HopA1s represents a unique system to study pathogen adaptation skills and host-jumps. However, molecular understanding of HopA1′s contribution to overall virulence remain undeciphered. Here, we show that immune-suppressive functions of HopA1_pst are more potent than HopA1_pss. In the resistance-compromised ENHANCED DISEASE SUSCEPTIBILITY 1 (EDS1) null-mutant, transcriptomic changes associated with HopA1_pss-elicited ETI are still induced and carry resemblance to PAMP-triggered immunity (PTI) signatures. Enrichment of HopA1_pss interactome identifies proteins with regulatory roles in post-transcriptional and translational processes. With our demonstration here that both HopA1 suppress reporter-gene translations in vitro imply that the above effector-associations with plant target carry inhibitory consequences. Overall, with our results here we unravel possible virulence role(s) of HopA1 in suppressing PTI and provide newer insights into its detection in resistant plants.

【 授权许可】

Unknown