Mitochondrial acyltransferase which transfers the acyl group to the N-terminus of glycine. Can conjugate a multitude of substrates to form a variety of N-acylglycines. Catalyzes the conjugation of arylacetic acids with glycine but does not have activity towards any alkyl-CoA. glycine + phenylacetyl-CoA = CoA + H(+) + phenylacetylglycine Belongs to the glycine N-acyltransferase family.