May play a regulatory role in the early step of oligosaccharide elicitor response, downstream of the membrane-associated high-affinity chitin-binding protein. By oligosaccharide elicitor (N-Acetylchitooligosaccharide) extracted from the rice blast fungus (M.grisea) cell wall. Strongest induction by chitin oligomer with greater degree of polymerization (heptamer). By inoculation of M.grisea in rice cell suspension culture. Induction by oligosaccharide elicitor is independent of de novo protein synthesis. Belongs to the GRAS family.