The enzyme 5 - enolpyuvyl - 3 - phosphoshikimic acid synthase ( epsp synthase ; ec2 . 5 . 1 . 19 ) , encoded by anoa locus , is a key enzyme present in microorganisms and plants where it has a function in the biosynthesis of aromatic amino acids . glyphosate ( n - phosphonomethyl - glycine ) is an effective non - selective , broad spectrum , postemergence herbicide , which has been shown to inhibit epsp synthase activity in a competitive manner . glyphosate tolerant plants can be mediated by either overproduction of the target enzyme or by the presence of an altered enzyme 植物和微生物芳香族氨基酸生物合成过程中的一个关键酶? ? 5 -烯醇丙酮莽草酸- 3 -磷酸合成酶( epspsynthase ； ec2 . 5 . 1 . 19 )由aroa基因编码，该酶受广谱灭生性、内吸传导型除草剂草甘膦的竞争性抑制，将epsp合成酶基因转入植物中可获得草甘膦耐受植株。
