4-Coumarate:coenzyme A ligase isoform 3 from <i>Piper nigrum</i> (Pn4CL3) catalyzes the CoA thioester formation of 3,4-methylenedioxycinnamic and piperic acids
作者:Zhehao Jin、Juraithip Wungsintaweekul、Sang-Hoon Kim、Jeong-Han Kim、Yongho Shin、Dae-Kyun Ro、Soo-Un Kim
DOI:10.1042/bcj20190527
日期:2020.1.17
enzyme, exhibited general 4CL activity towards coumaric and ferulic acids. However, Pn4CL3 was also active towards piperonylic acid, 3,4-MDCA, and piperic acid. Pn4CL3 possessed ∼2.6 times higher catalytic efficiency (kcat/KM) towards 3,4-MDCA and piperic acid than towards coumaric and ferulic acids, suggesting its specific role in piperine biosynthesis. Different substrate preference among the Pn4CL isoforms
黑胡椒,Piper nigrum L.的干绿色水果,是世界上最受欢迎的家用香料。胡椒碱是黑胡椒的刺激性化合物,被认为部分源自苯丙烷途径。在胡椒碱的生物合成中,4-香豆酸酯:CoA连接酶(4CL)必须在将中间酸活化为相应的CoA硫酯作为底物方面发挥关键作用。基于转录组数据,我们从未成熟的胡椒中分离出三种黑假单胞菌4CL亚型(Pn4CL1,-2和-3)。这些Pn4CLs在大肠杆菌中表达,用于使用假定的底物,即肉桂酸,香豆酸,阿魏酸,胡椒基,3,4-亚甲基二氧肉桂酸(3,4-MDCA)和胡椒酸进行体外酶法测定。系统发育分析和底物使用研究表明,对香豆酸和阿魏酸有活性的Pn4CL1属于木质素合成的I类4CL。Pn4CL2是典型的肉桂酸酯特异的香豆酸盐:CoA连接酶样(CLL)蛋白。作为II类酶的Pn4CL3对香豆酸和阿魏酸具有一般的4CL活性。然而,Pn4CL3也对胡椒酸,3,4-MDCA和胡椒酸有活性。Pn4CL3对3