So it has increasing commercial demand . escherichia coli and many other microoganism synthesize aromatic amino acids through the condensation reaction between phosphoenolpyru vate ( pep ) and erythrose - 4 - phosphate ( e4p ) to form 3 - deoxy - d - arabinohep tulosonate 7 - phosphate ( dahp ) . pep and e4p are limiting substrates for formation of dahp 大肠杆菌和许多微生物一样，其合成芳香族氨基酸的起始物是由磷酸烯醇式丙酮酸( pep )和4 -磷酸赤癣糖( e4p )二者缩合形成的3 -脱氧- -阿拉伯庚酮糖酸- 7 -磷酸( dahp ) 。
With the increase of - cyclodextrin concentration , the decrease of temperature and prolongation of time , the inclusion complexes of - cyclodextrin with these aromatic ami no acids became more stable . these results showed that the inclusion was a reversible equilibrium process and the inclusion of - cyclodextrin with these aromatic amino acids was exothermic 从紫外光谱和荧光光谱测试结果表明， ?环糊精用量的增加、温度的降低、时间的延长，有利于?环糊精与这三种芳香族氨基酸形成较为稳定的包合物。
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。
The 1 : 1 inclusion complexes of - cyclodextrin with phenylalanine and tyrosine were formed ; but 2 : 1 complex was afford from - cyclodextrin with tryptophan owing to the various sites and chaps of different amino acids . the inclusion behaviors of - cyclodextrin and its polylactide - garfted copolymer with insulin were also studied via ultraviolet and fluorescent spectrometry 随着?环糊精用量的增加和作用时间的延长， ?坏糊精对芳香族氨基酸的包合作用增强，揭示了?环糊精与芳香族氨基酸包合物在水溶液中的形成是一动态平衡过程。
The common biosynthesis pathway of aromatic amino acids includes seven steps from dahp to chorismate acid . for the common pathway , 3 - dehydroquinate ( dhq ) synthase ( encoded by arob ) , 5 - enolpyruv - oylshikimate s - phosphate ( epsp ) synthase ( encoded by aroa ) , and chorisma - te synthase ( encoded by aroc ] are rate - limiting enzymes 芳香族氨基酸的合成步骤有七步是共同的，亦即从dahp到分支酸的合成步骤，其中脱氢奎宁酸合成酶( arob ) 、 5 -烯醇式丙酮酰莽草酸合成酶( aroa )和分支酸合成酶( aroc )是此代谢途径的关键酶。
