Structural Damage of a β-Sheet Protein upon Adsorption onto Molybdenum Disulfide Nanotubes

详细信息    查看全文

• 作者：Yang Ling ; Zonglin Gu ; Seung-gu Kang ; Judong Luo ; Ruhong Zhou
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：March 31, 2016
• 年：2016
• 卷：120
• 期：12
• 页码：6796-6803
• 全文大小：533K
• ISSN：1932-7455

文摘

Molybdenum disulfide (MoS₂), a new type of transition metal dichalcogenides nanomaterial, has attracted significant attention lately in the biomedical industry, with many promising applications such as photothermal-triggered drug delivery agent for cancer. Accompanied with these promising applications are the growing concerns about their potential biocompatibility. Here, we use all-atom molecular dynamics simulations to investigate the interaction of a MoS₂ nanotube with YAP65 WW domain, a mostly antiparallel β-sheet model protein widely used in molecular simulations. We find that YAP65 loses most of its secondary and tertiary structures within a few hundred nanoseconds after adsorbing onto the MoS₂ nanotube surface, indicating that the MoS₂ nanotube displays significant structural damage to YAP65. The strong dispersion interactions, especially from those “signature” aromatic residues (Tyr28 and Trp39), help drive YAP65 adsorption onto the nanotube surface, which thus breaks the native beta strand hydrogen bond network and subsequently destroys the secondary and tertiary structures. These findings might shed new light onto the potential nanotoxicity of MoS₂ nanomaterial and its underlying molecular mechanism.