Page 211 - 《精细化工》2022年第3期
P. 211

第 39 卷第 3 期                             精   细   化   工                                  Vol.39, No.3
             2022 年 3 月                              FINE CHEMICALS                                 Mar.  2022


              精细化工中间体
                         FgaPT2 酶催化合成 C-4 异戊烯基化吲哚


                                  二酮哌嗪和定向诱变增强收率



                                                                                            2
                                                                  2
                                                                               2
                            张弘弛      1,2 ,刘   瑞    1,2* ,高志慧 ,李   慧 ,杨   阳
                 (1.  山西大同大学  生命科学学院  山西  大同   037009;2.  山西大同大学  应用生物技术研究所  山西  大
                 同  037009)

                 摘要:在二甲基烯丙基二磷酸存在下,通过 FgaPT2 酶催化合成了一系列 C-4 异戊烯基化吲哚二酮哌嗪,测试了
                 其生物活性,对生物活性最高的产物,探讨了通过定点诱变提高酶合成的可行性。结果表明,FgaPT2 酶催化合
                 成了 7 个 C-4 异戊烯基化吲哚二酮哌嗪,FgaPT2 对底物具有一定的选择性,环-L-色氨酸-L-酪氨酸(Ⅰe)异戊
                 烯基化催化效果最好,产物环-L-4-二甲基烯丙基-色氨酸-L-酪氨酸(Ⅱe)收率达 36.1%。C-4 异戊烯基化显著
                 提高了吲哚二酮哌嗪的生物活性,尤其是环-L-4-二甲基烯丙基-色氨酸-L-色氨酸(Ⅱf)对 A549 和 MCF-7 细胞
                 达到 50%抑制效果时抑制剂的浓度(IC 50 值)分别为 54.6 和 30.7 μmol/L,对测试细菌和真菌的最低抑制浓度(MIC
                 值)在 0.5~4 mg/L,1,1-二苯基-2-三硝基苯肼自由基清除活性的 IC 50 值为 98 μmol/L。Arg-244 的定点诱变表明,
                 在 19 个突变体中,52.6%的 FgaPT2 突变体提高了Ⅱf 收率,动力学参数验证了环-L-色氨酸-L-色氨酸(Ⅰf)与
                 突变 FgaPT2 之间的相互作用,可以提高Ⅱf 收率,其中 R244M 对Ⅰf 的亲和力最高,Michaelis-Menten 常数(K M )
                 为 0.14 mmol/L,转化数(k cat )为 0.0647 1/s,k cat /K M 为 462.14 L/(s·mmol),产物收率最高,为 36.9%±1.2%。
                 关键词:吲哚二酮哌嗪;异戊二烯色氨酸合成酶;生物活性;定向诱变;精细化工中间体
                 中图分类号:O629.3;TQ251.3;TQ426      文献标识码:A      文章编号:1003-5214 (2022) 03-0633-11


               FgaPT2 enzymatic synthesis of C-4 isopentenylated indole diketopiperazines

                                    and directed mutagenesis enhanced yield

                                                                                           2
                                                                       2
                                                                              2
                                              1,2
                              ZHANG Hongchi , LIU Rui   1,2* , GAO Zhihui , LI hui , YANG Yang
                 (1.  College of Life Science, Shanxi Datong University, Datong  037009,  Shanxi, China; 2. Applied  Biotechnology
                 Institute, Shanxi Datong University, Datong 037009, Shanxi, China)
                 Abstract: In the  presence of dimethylallyl diphosphate, a  series of C-4 isopentenylated indole
                 diketopiperazines  were synthesized by FgaPT2 enzymatic catalysis. The  bioactivity  of the products was
                 tested. For the product with the highest biological activity, the feasibility of site-directed mutagenesis to
                 increase the yield of enzyme synthesis was studied.  The  results showed that seven C-4 isopentenylated
                 indole diketopiperazines were obtained. FgaPT2 exhibited certain selectivity for substrates, and had the best
                 catalytic effect on cyclo-L-tryptophan-L-tyrosine (Ⅰe), the product cyclo-L-4-dimethylallyl-Trp-L-Tyr (Ⅱe)
                 had a yield of 36.1%. C-4 isopentenylation significantly improved the biological activity of indoledione
                 piperazine. Especially, for cyclo-L-4-dimethylallyl-Trp-L-Trp (Ⅱf), the IC 50 [half maximal (50%) inhibitory
                 concentration] values on A549 and MCF-7 cells were 54.6 and 30.7 μmol/L, respectively, the MIC (minimum
                 inhibitory concentration) values of test bacteria  and  fungi  were  0.5~4  mg/L,  and  the  IC 50 value of
                 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity was  98  μmol/L. Site-directed mutagenesis of
                 Arg-244 showed that among nineteen mutants, 52.6% of  FgaPT2 mutants increased the yield  of  Ⅱf.
                 Kinetic parameters verified the interaction between cyclo-L-Trp-L-Trp (Ⅰf) and mutant of FgaPT2, which


                 收稿日期:2021-08-25;  定用日期:2021-11-10; DOI: 10.13550/j.jxhg.20210862
                 基金项目:山西省应用基础研究计划(201801D221240);山西省高等学校科技创新项目(2020L0485);山西大同大学科研基金
                 (2019K15)
                 作者简介:张弘弛(1980—),男,副教授,E-mail:zhanghclw@163.com。联系人:刘   瑞(1982—),女,教授,E-mail: liurlw@163.com。
   206   207   208   209   210   211   212   213   214   215   216