Phospholipase hydrolyzes phosphatidylcholine to generate phosphatidic acid, a lipid that favors membranes with negative curvature and thus can facilitate virion envelopment, and later membrane fission and fusion.
Lipase activities of p37, the major envelope protein of vaccinia virus
S H Baek, J Y Kwak, S H Lee, T Lee, S H Ryu, D J Uhlinger, J D Lambeth
J Biol Chem. 1997 Dec 19;272(51):32042-9.