Enables glycerol-3-phosphate O-acyltransferase activity. Acts upstream of or within several processes, including glycerolipid metabolic process; lipid homeostasis; and negative regulation of activation-induced cell death of T cells. Located in mitochondrion. Is expressed in several structures, including alimentary system; genitourinary system; nervous system; respiratory system; and sensory organ. Orthologous to human GPAM (glycerol-3-phosphate acyltransferase, mitochondrial). [provided by Alliance of Genome Resources, Apr 2022]