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
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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
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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。