Effector that promotes P.infestans virulence in Nicotiana benthamiana and potato (PubMed:29588335). Attenuates cell death triggered by the pathogen-associated molecular pattern infestin 1 (INF1), indicating that the effector suppresses pattern-triggered immunity. However, it does not attenuate cell death triggered by a range of resistance proteins, suggesting that it specifically suppresses INF1-triggered cell death (ICD) (PubMed:29588335). Targets host MAP3K VIK in order to utilize or promote its ability to negatively regulate immunity (PubMed:29588335). Interacts directly with the potato ortholog of vascular highway 1 (VH1)-interacting kinase (VIK), encoding a predicted MEK kinase (MAP3K). Expression is up-regulated during the biotrophic phase of infection on host plants. The RxLR-dEER motif acts to carry the protein into the host cell cytoplasm through binding to cell surface phosphatidylinositol-3-phosphate. Belongs to the RxLR effector family.