In the current study, the cyclopeptide alkaloid discarine D-derived tri-peptides fragments were synthesized and then investigated for their inhibitory potential against krait (Bungarus sindanus) venom acetylcholinesterase (AChE) enzyme. The tri-peptides L-Leu- threo-D-Pheser-L-Phe and L-Leu- threo-L-Pheser-L-Phe were chemically synthesized by a conventional method using the benzyloxycarbonyl group for the alpha-amino (α-amino) safety and the methyl esters an amino acids derivative used for the safety of carboxyl group. The present paper described that the general synthetic strategy of tri-peptide allows the tri-peptide sequence to be acquired with the N-terminal extreme protected. Kinetic studies using the Lineweaver Burk plot indicated that tri-peptides fragments cause an un-competitive type of inhibition i.e. both Km and Vmax values decreased with the increase of tri-peptides fragment concentration (13.5–22.5 µM). The estimated Ki and IC50 for krait venom AChE were found to be 17.5 µM and 19.5 µM, respectively. Thus the present paper, clarified that the freshly produced tri-peptides fragment can be deliberated as a beneficial mediator for the inhibition of krait venom AChE.
本研究合成了环肽
生物碱 Discarine D 衍生的三肽片段,并研究了它们对甲壳虫(Bungarus sindanus)毒液
乙酰胆碱酯酶(AChE)的抑制潜力。L-Leu- threo-D-Pheser-L-Phe和L-Leu- threo-L-Pheser-L-Phe三肽的
化学合成采用传统方法,以苄氧羰基为α-
氨基(α-amino)安全基,以
氨基酸衍
生物甲酯为羧基安全基。本文介绍了三肽的一般合成策略,可以获得 N 端极端受保护的三肽序列。使用 Lineweaver Burk 图谱进行的动力学研究表明,三肽片段会产生非竞争性抑制,即 Km 和 Vmax 值会随着三肽片段浓度(13.5-22.5 µM)的增加而降低。据估计,甲龙虾毒 AChE 的 Ki 和 IC50 分别为 17.5 µM 和 19.5 µM。因此,本文明确指出,新鲜生产的三肽片段可被视为抑制甲龙蛇毒 AChE 的有益介质。