Catalyzes the conversion of fatty acids such as long-chain and very long-chain fatty acids to their active form acyl-CoAs for both synthesis of cellular lipids, and degradation via beta-oxidation (By similarity) (PubMed:11112418, PubMed:12975357, PubMed:14516277). Can activate diverse saturated, monosaturated and polyunsaturated fatty acids (PubMed:11112418, PubMed:14516277). a long-chain fatty acid + ATP + CoA = a long-chain fatty acyl-CoA + AMP + diphosphate (E)-hexadec-2-enoate + ATP + CoA = (2E)-hexadecenoyl-CoA + AMP + diphosphate ATP + CoA + hexadecanoate = AMP + diphosphate + hexadecanoyl-CoA Mainly expressed in brain. Also expressed in adrenal gland and testis. In brain, it is present in cerebral cortical and cerebellar neurons and in steroidogenic cells of the adrenal gland, testis and ovary (at protein level). First detected on embryonic day 18 and increases steadily towards adulthood. Belongs to the ATP-dependent AMP-binding enzyme family. Bubblegum subfamily. Extended N-terminus.