Reaction catalyzed by long-chain fatty acid adenylase/transferase FadD23 (6.2.1.57)

		+		a holo-[(hydroxy)phthioceranic acid synthase]	=		AMP	+		a stearoyl-[(hydroxy)phthioceranic acid synthase]
	(stearoyl)adenylate	+		a holo-[(hydroxy)phthioceranic acid synthase]	=		AMP	+		a stearoyl-[(hydroxy)phthioceranic acid synthase]