Enables G protein-coupled receptor activity. Involved in positive regulation of inflammatory response and regulation of vascular permeability. Acts upstream of or within several processes, including blood vessel development; negative regulation of angiogenesis; and response to acidic pH. Predicted to be located in plasma membrane. Predicted to be integral component of plasma membrane. Orthologous to human GPR4 (G protein-coupled receptor 4). [provided by Alliance of Genome Resources, Apr 2022]