In-silico identification of the binding mode of synthesized adamantyl derivatives inside cholinesterase enzymes
作者:Amal Al-Aboudi、Raed A Al-Qawasmeh、Alaa Shahwan、Uzma Mahmood、Asaad Khalid、Zaheer Ul-Haq
DOI:10.1038/aps.2014.173
日期:2015.7
To investigate the binding mode of synthesized adamantly derivatives inside of cholinesterase enzymes using molecular docking simulations. A series of hybrid compounds containing adamantane and hydrazide moieties was designed and synthesized. Their inhibitory activities against acetylcholinesterase (AChE) and (butyrylcholinesterase) BChE were assessed in vitro. The binding mode of the compounds inside cholinesterase enzymes was investigated using Surflex-Dock package of Sybyl7.3 software. A total of 26 adamantyl derivatives were synthesized. Among them, adamantane-1-carboxylic acid hydrazide had an almost equal inhibitory activity towards both enzymes, whereas 10 other compounds exhibited moderate inhibitory activity against BChE. The molecular docking studies demonstrated that hydrophobic interactions between the compounds and their surrounding residues in the active site played predominant roles, while hydrophilic interactions were also found. When the compounds were docked inside each enzyme, they exhibited stronger interactions with BChE over AChE, possibly due to the larger active site of BChE. The binding affinities of the compounds for BChE and AChE estimated were in agreement with the experimental data. The new adamantly derivatives selectively inhibit BChE with respect to AChE, thus making them good candidates for testing the hypothesis that BChE inhibitors would be more efficient and better tolerated than AChE inhibitors in the treatment of Alzheimer's disease.
通过分子对接模拟研究合成的金刚烷衍生物在胆碱酯酶中的结合模式。设计并合成了一系列含有金刚烷和酰肼基团的杂化化合物,并在体外评估了它们对乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BChE)的抑制活性。利用Sybyl7.3软件中的Surflex-Dock包研究了这些化合物在胆碱酯酶中的结合模式。总共合成了26种金刚烷衍生物。其中,金刚烷-1-羧酸酰肼对两种酶的抑制活性几乎相等,而另外10种化合物对BChE表现出中等的抑制活性。分子对接研究表明,化合物与活性位点周围残基之间的疏水相互作用起主导作用,同时也发现了亲水相互作用。当这些化合物对接在每种酶内部时,它们与BChE的相互作用更强于AChE,这可能是因为BChE的活性位点较大。对化合物对BChE和AChE的结合亲和力的估算与实验数据一致。新型的金刚烷衍生物对BChE相对于AChE具有选择性抑制作用,因此它们是检验以下假设的良好候选物:与AChE抑制剂相比,BChE抑制剂在治疗阿尔茨海默病方面更为有效且更易耐受。