Enables substance P receptor binding activity. Involved in several processes, including learning or memory; positive regulation of secretion; and positive regulation of synaptic transmission. Located in extracellular space and plasma membrane. Used to study central sleep apnea and pulmonary hypertension. Biomarker of colitis and respiratory syncytial virus infectious disease. Orthologous to human TAC1 (tachykinin precursor 1). [provided by Alliance of Genome Resources, Apr 2022]