O-acetyltransferase activity N-acetylneuraminate 9-O-acetyltransferase activity https://github.com/geneontology/go-ontology/issues/29625 https://github.com/geneontology/go-ontology/issues/30557 acetyl-CoA:N-acetylneuraminate-9(or 7)-O-acetyltransferase activity glycoprotein 7(9)-O-acetyltransferase activity acetyl-CoA:N-acetylneuraminate 7-O(or 9-O)-acetyltransferase activity acetyl-CoA:N-acetylneuraminate-9(7)-O-acetyltransferase activity acetyl-CoA:N-acetylneuraminate-7- and/or 8-O-acetyltransferase activity MetaCyc:RXN-7864 N-acetylneuraminate 7(8)-O-acetyltransferase activity Catalysis of the reaction: CMP-N-acetyl-beta-neuraminate + acetyl-CoA = CMP-N-acetyl-9-O-acetyl-beta-neuraminate + CoA. N-acetylneuraminate 7-O(or 9-O)-acetyltransferase activity EC:2.3.1.45 N-acetylneuraminate 7,8-O-acetyltransferase activity acetyl-CoA:N-acetylneuraminate-7- or 8-O-acetyltransferase activity RHEA:81827 molecular_function sialate O-acetyltransferase N-acetylneuraminate O7-(or O9-)acetyltransferase activity GO:0047186