Dehghan Zeinab, Ayat Hoda, Mohammad Ahadi Ali
Department of Genetics, School of Science, Shahrekord University, Shahrekord, Iran.
Iran J Pharm Res. 2020 Summer;19(3):206-216. doi: 10.22037/ijpr.2019.15339.13028.
Scorpion venom contains different toxins with multiple biological functions. IMe-AGAP is the first Analgesic-Antitumor like Peptide (AGAP) isolated from Iranian scorpion . This peptide is similar to AGAP toxin with high analgesic activity, extracted from Chinese scorpion and inhibits NaV1.8 and NaV1.9 voltage-gated sodium channels involved in the pain pathway. In this study, IMe-AGAP was cloned in a prokaryotic expression vector; expression of toxin in ) was assayed and then purified. In studies, peptide sequence was compared with other scorpion analgesic toxins. The structures of IMe-AGAP and sodium channels were modeled using homology modeling. Structural evaluation and stereo-chemical analysis of modeled structures were performed using RAMPAGE web server Ramachandran plots. Hex Server was used to investigate the interactions between IMe-AGAP and S3-S4 and also S5-S6 segments of NaV1.8 and NaV1.9. Binding energies calculation was used for evaluation of protein docking. Soluble expression of IMe-AGAP in bacteria was investigated by SDS-PAGE analysis. Pure recombinant protein was obtained by Ni-NTA affinity chromatography. The results of three-dimensional structure prediction showed βαββ topology for the toxin that is similar to the conserved structure of α-toxins. Comparison analysis between IMe-AGAP and AGAP toxins exhibited high similarity in homology modeling. Docking analysis demonstrated that IMe-AGAP can interact with NaV1.8 and NaV1.9 domains involved in pain According to the results of homology studies and docking, IMe-AGAP might be a novel potential drug for pain treatment.
蝎毒含有具有多种生物学功能的不同毒素。IMe - AGAP是从伊朗蝎子中分离出的首个类镇痛 - 抗肿瘤肽(AGAP)。这种肽与从中国蝎子中提取的具有高镇痛活性的AGAP毒素相似,可抑制疼痛通路中涉及的NaV1.8和NaV1.9电压门控钠通道。在本研究中,IMe - AGAP被克隆到原核表达载体中;检测毒素在(此处原文缺失具体内容)中的表达,然后进行纯化。在研究中,将肽序列与其他蝎镇痛毒素进行比较。使用同源建模对IMe - AGAP和钠通道的结构进行建模。使用RAMPAGE网络服务器的拉氏图对建模结构进行结构评估和立体化学分析。使用Hex服务器研究IMe - AGAP与NaV1.8和NaV1.9的S3 - S4以及S5 - S6片段之间的相互作用。使用结合能计算来评估蛋白质对接。通过SDS - PAGE分析研究IMe - AGAP在细菌中的可溶性表达。通过Ni - NTA亲和层析获得纯重组蛋白。三维结构预测结果显示该毒素具有βαββ拓扑结构,与α - 毒素的保守结构相似。IMe - AGAP与AGAP毒素之间的比较分析在同源建模中显示出高度相似性。对接分析表明IMe - AGAP可与参与疼痛的NaV1.8和NaV1.9结构域相互作用。根据同源性研究和对接结果,IMe - AGAP可能是一种新型潜在的疼痛治疗药物。