Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt.
Chemistry of Medicinal Plants Department, Biology Unit, Central Laboratory for Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt.
Z Naturforsch C J Biosci. 2020 Dec 24;76(7-8):301-315. doi: 10.1515/znc-2020-0198. Print 2021 Jul 27.
Pentacyclic triterpenes and cardenolides were isolated from leaves. Their chemical structures were determined based on comprehensive 1D and 2D NMR spectroscopy. Their MIC was determined against 12 microorganisms. Their exerted cytotoxicity on the immortalized normal cells, hTERT-RPE1 was assessed by the sulforhodamine-B assay. The viral inhibitory effects of compounds against Newcastle disease virus (NDV) and H5N1 influenza virus IV were evaluated. Four antioxidant assays were performed in comparison with BHT and trolox and a weak activity was exhibited. Acovenoside A was with potent against H5N1-IV and NDV with IC ≤ 3.2 and ≤ 2.1 μg/ml and SI values of 93.75 and 95.23%, respectively, in comparison to ribavirin. Its CC record on Vero cells was > 400 and 200 μg/ml, respectively. Acobioside A was the most active compound against a broad range of microbes while was the most sensitive. Its MIC (0.07 μg/ml) was 1/100-fold of the recorded CC (7.1 μg/ml/72 h) against hTERT-RPE1. The molecular docking of compounds on human DNA topoisomerase I (Top1-DNA) and IV glycoprotein hemagglutinin were studied using MOE program. This study has introduced the cardenolides rather than triterpenoids with the best docking score and binding interaction with the active site of the studied proteins.
五环三萜和强心苷从叶片中分离得到。基于全面的 1D 和 2D NMR 光谱确定了它们的化学结构。测定了它们对 12 种微生物的 MIC。通过磺基罗丹明 B 测定法评估了它们对永生化正常细胞 hTERT-RPE1 的细胞毒性。用新城疫病毒 (NDV) 和 H5N1 流感病毒 IV 评估了化合物的抗病毒效果。与 BHT 和 Trolox 进行了四项抗氧化测定，显示出较弱的活性。Acovenoside A 对 H5N1-IV 和 NDV 的 IC 分别为 ≤ 3.2 和 ≤ 2.1μg/ml，SI 值分别为 93.75 和 95.23%，与利巴韦林相比。其在 Vero 细胞上的 CC 记录分别为 >400 和 200μg/ml。Acobioside A 对广谱微生物最具活性，而 最敏感。其 MIC（0.07μg/ml）是 hTERT-RPE1 记录 CC（7.1μg/ml/72h）的 1/100 倍。使用 MOE 程序研究了化合物与人 DNA 拓扑异构酶 I（Top1-DNA）和 IV 糖蛋白血凝素的分子对接。本研究介绍了强心苷而不是三萜类化合物，它们具有最佳的对接评分和与研究蛋白活性位点的结合相互作用。
