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 (By similarity). an acyl-CoA + glycine = an N-acylglycine + CoA + H(+) Belongs to the glycine N-acyltransferase family. Truncated C-terminus.