Rust effector delivered into infected tissues to modulate host functions and contribute to pathogen virulence (PubMed:27868319). Enhances leaf colonization by the bacteria Pseudomonas syringae and the oomycete Hyaloperonospora arabidopsidis pathogens in an Arabidopsis thaliana infection model (PubMed:27868319). Expression is induced during host infection. Belongs to the CPGH1 family.