1'-[1,2-diacyl-sn-glycero-3-phospho],3'-[1-acyl-sn-glycero-3-phospho]-glycerol + (5Z,8Z,11Z,14Z)-eicosatetraenoyl-CoA <=> 1'-[1,2-diacyl-sn-glycero-3-phospho],3'-[1-acyl,2-(5Z,8Z,11Z,14Z)-eicosatetraenoyl-sn-glycero-3-phospho]-glycerol + CoA