Enables protein phosphatase inhibitor activity. Involved in defense response to Gram-positive bacterium; negative regulation of cytokine production; and ubiquitin-dependent protein catabolic process. Located in cytoplasm. Is expressed in several structures, including central nervous system; gut; hemolymphoid system gland; integumental system; and male reproductive gland or organ. Orthologous to human PPP1R11 (protein phosphatase 1 regulatory inhibitor subunit 11). [provided by Alliance of Genome Resources, Apr 2022]