Suvaithenamudhan Suvaiyarasan, Parthasarathy Subbiah
Department of Bioinformatics, School of Life Sciences, Bharathidasan University, Tiruchirappalli - 620 024, Tamil Nadu, India.
Curr Comput Aided Drug Des. 2017;13(3):234-248. doi: 10.2174/1573409913666170301120421.
BACKGROUND: Top five best hit compounds (ZINC59376795, ZINC60175365, ZINC36922620, ZINC39550705 and ZINC36953975) were obtained through our high throughput virtual screening (HTVS) analysis with resistant 5204-PBP2B (5204 Penicillin Binding Protein 2B) and sensitive R6-PBP2B (R6 Penicillin Binding Protein 2B) proteins of Streptococcus pneumoniae. OBJECTIVE: To gain insight in molecular docking and dynamics simulations of these top five best hit compounds with both resistant 5204-PBP2B and sensitive R6-PBP2B targets. METHODS: We have employed Glide XP docking and molecular dynamics simulations of these five best hit compounds with 5204-PBP2B and R6-PBP2B targets. The stability analysis has been carried out through DFT, prime-MM/GBSA binding free energy, RMSD, RMSF and Principal Component Analysis. RESULTS: The reference drug, penicillin G forms stable complex with sensitive R6-PBP2B protein. Similar stability is observed for the mutant resistant 5204-PBP2B with the top scoring compound ZINC592376795 which implies that this compound may act as an effective potential inhibitor. The compound ZINC59376795 forms a total of five hydrogen bonds with resistant 5204-PBP2B protein of which three are with mutated residues. Similarly, the other four compounds including penicillin G also form hydrogen bonds with mutated residue. The MD simulations and stability analysis of the complexes of wild and mutant forms are evaluated for a trajectory period of 16ns and further MD simulations of ZINC59376795 with resistant 5204-PBP2B and sensitive R6-PBP2B confirmed the stability for 50 ns. CONCLUSION: These results suggest that the top five best hit compounds are found to be a promising gateway for the further development of anti-pneumococcal therapeutics.
背景:通过我们对肺炎链球菌耐药的5204 - PBP2B(5204青霉素结合蛋白2B)和敏感的R6 - PBP2B(R6青霉素结合蛋白2B)蛋白进行的高通量虚拟筛选(HTVS)分析,获得了排名前五的最佳命中化合物(ZINC59376795、ZINC60175365、ZINC36922620、ZINC39550705和ZINC36953975)。 目的:深入了解这排名前五的最佳命中化合物与耐药的5204 - PBP2B和敏感的R6 - PBP2B靶点的分子对接和动力学模拟情况。 方法:我们对这五个最佳命中化合物与5204 - PBP2B和R6 - PBP2B靶点进行了Glide XP对接和分子动力学模拟。通过密度泛函理论(DFT)、Prime - MM/GBSA结合自由能、均方根偏差(RMSD)、均方根波动(RMSF)和主成分分析进行稳定性分析。 结果:参考药物青霉素G与敏感的R6 - PBP2B蛋白形成稳定复合物。对于突变耐药的5204 - PBP2B与得分最高的化合物ZINC592376795也观察到类似的稳定性,这表明该化合物可能作为一种有效的潜在抑制剂。化合物ZINC59376795与耐药的5204 - PBP2B蛋白总共形成了五个氢键,其中三个与突变残基形成氢键。同样,包括青霉素G在内的其他四种化合物也与突变残基形成氢键。对野生型和突变型复合物进行了16纳秒轨迹周期的分子动力学模拟和稳定性分析,对ZINC59376795与耐药的5204 - PBP2B和敏感的R6 - PBP2B的进一步分子动力学模拟证实了50纳秒的稳定性。 结论:这些结果表明,排名前五的最佳命中化合物有望成为抗肺炎球菌治疗药物进一步开发的切入点。
Antimicrob Agents Chemother. 2004-5
J Antimicrob Chemother. 2006-1