serine O-acyltransferase activity RHEA:68288 RHEA:68300 molecular_function RHEA:68284 RHEA:68280 GO:0016412 RHEA:59972 RHEA:68276 RHEA:68272 RHEA:68296 RHEA:68292 RHEA:59964 Catalysis of the reaction: a fatty acyl-CoA + L-seryl-[protein] = CoA + O-fatty acyl-L-seryl-[protein]. acyltransferase activity, transferring groups other than amino-acyl groups