Enables glycerol-3-phosphate O-acyltransferase activity. Involved in several processes, including glycerolipid biosynthetic process; positive regulation of triglyceride biosynthetic process; and response to fructose. Located in mitochondrial outer membrane. Biomarker of nephrotic syndrome and obesity. Orthologous to human GPAM (glycerol-3-phosphate acyltransferase, mitochondrial). [provided by Alliance of Genome Resources, Apr 2022]