Computational improvement of small-molecule inhibitors of Bacillus anthracis protective antigen activation through isostere-based substitutions

• Autor(a) principal: Silva, Pedro J.
• Data de Publicação: 2020
• Outros Autores: Silva, Sandra V.R.L.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10284/8816
• topic: Anthrax; Lead compounds; Molecular dynamics; Docking

There has recently been interest in the development of small-molecule inhibitors of the oligomerization of Bacillus anthracis protective antigen for therapeutic use. Some of the proposed lead compounds have, however, unfavorable solubility in aqueous medium, which prevents their clinical use. In this computational work, we have designed several hundreds of derivatives with progressively higher hydro-solubility and tested their ability to dock the relevant binding cavity. The highest-ranking docking hits were then subjected to 125 nslong simulations to ascertain the stability of the binding modes. Several of the potential candidates performed quite disappointingly, but two molecules showed very stable binding modes throughout the complete simulations. Besides the identification of these two promising leads, these molecular dynamics simulations allowed the discovery of several insights that shall prove useful in the further improvement of these candidate towards higher potency and stability.