Inhibitors of two enzymes which metabolize cytokinins
作者:Charles W. Parker、Barrie Entsch、David S. Letham
DOI:10.1016/s0031-9422(00)85471-0
日期:1986.1
3-methyl-7-n-pentylaminopyrazolo[4,3-d]pyrimidine, which acted competitively (Ki, 22 μM), and the diaminopurine, 6-benzylamino-2-(2-hydroxyethylamino)-9-methylpurine (Ki, 3.3 μM). However these compounds were ineffective as inhibitors of the cytokinin-alanine synthase which was inhibited competitively by IAA (Ki 70 μM) and relatedcompounds, especially 5,7-dichloro-IAA (Ki 0.4 μM). Certain urea derivatives were moderately
摘要 抑制细胞分裂素自然代谢失活的化合物具有重要的生理意义。在这项研究中,发现了两种酶的抑制剂,它们形成细胞分裂素碱基的葡萄糖和丙氨酸结合物,即细胞分裂素 7-葡萄糖基转移酶和 β-(9-细胞分裂素)丙氨酸合酶。对前一种酶发现的最有效抑制剂是细胞分裂素类似物 3-methyl-7-n-pentylaminopyrazolo[4,3-d]pyrimidine,它具有竞争性(Ki,22 μM)和二氨基嘌呤,6-benzylamino-2 -(2-羟乙基氨基)-9-甲基嘌呤 (Ki, 3.3 μM)。然而,这些化合物作为细胞分裂素-丙氨酸合酶的抑制剂无效,该酶被 IAA (Ki 70 μM) 和相关化合物,尤其是 5,7-二氯-IAA (Ki 0.4 μM) 竞争性抑制。
Promiscuous enzyme-catalyzed regioselective Michael addition of purine derivatives to α,β-unsaturated carbonyl compounds in organic solvent
作者:Jun-Liang Wang、Jian-Ming Xu、Qi Wu、De-Shui Lv、Xian-Fu Lin
DOI:10.1016/j.tet.2009.01.056
日期:2009.3
Michael addition of purine derivatives to α,β-unsaturatedcarbonylcompounds could be catalyzed by d-aminoacylase amano (DA) in DMSO. The influence of reaction conditions on the Michael addition, including solvent, temperature, and enzyme concentration was systematically investigated. Then we extended this methodology to six structurally diverse purine derivatives and a variety of α,β-unsaturated carbonyl