Activation of long-chain fatty acids for both synthesis of cellular lipids, and degradation via beta-oxidation. Preferentially uses palmitate, palmitoleate, oleate and linoleate. a long-chain fatty acid + ATP + CoA = a long-chain fatty acyl-CoA + AMP + diphosphate Lipid metabolism; fatty acid metabolism. Highly expressed in developing seeds and young rosette leaves. Reduced amount long-chain fatty acid (LCFA). Belongs to the ATP-dependent AMP-binding enzyme family.