This domain is found in AvrM-A present in Melampsora lini. AvrM-A is a natural variant of AvrM which is a secreted effector protein that can internalize into plant cells in the absence of the pathogen and bind to phosphoinositides. AvrM results in effector-triggered immunity. This domain makes up part of the C-terminal region, which is highly conserved in AvrM. The domain is required for M-dependent effector-triggered immunity [1].

1: Structures of the flax-rust effector AvrM reveal insights into the molecular basis of plant-cell entry and effector-triggered immunity. Ve T, Williams SJ, Catanzariti AM, Rafiqi M, Rahman M, Ellis JG, Hardham AR, Jones DA, Anderson PA, Dodds PN, Kobe B; Proc Natl Acad Sci U S A. 2013;110:17594-17599. PMID:24101475