Secreted effector that enables the plant pathogenic fungus to manipulate host defenses for successful infection. Binds chitin and suppresses the chitin-induced reactive oxygen species (ROS) burst. Chitin-induced polymerization of homodimers forms a contiguous Mg1LysM highly oligomeric super-complexe that is anchored to the chitin in the fungal cell wall to prevent hydrolysis by host chitinases