Molecular Mechanisms of Interactions between Monolayered Transition Metal Dichalcogenides and Biological Molecules
Molybdenum
Hydrolases
Surface Properties
beta-Glucosidase
Clostridium cellulovorans
02 engineering and technology
Molecular Dynamics Simulation
Sphingomonas
Vibration
Tungsten
Lactococcus lactis
Bacterial Proteins
Spectroscopy, Fourier Transform Infrared
Adsorption
Disulfides
0210 nano-technology
Hydrophobic and Hydrophilic Interactions
Glucosidases
DOI:
10.1021/jacs.9b03641
Publication Date:
2019-06-03T19:12:45Z
AUTHORS (7)
ABSTRACT
Single layered two-dimensional (2D) materials such as transition metal dichalcogenides (TMDs) show great potential in many microelectronic or nanoelectronic applications. For example, because of extremely high sensitivity, TMD-based biosensors have become promising candidates for next-generation label-free detection. However, very few studies have been conducted on understanding the fundamental interactions between TMDs and other molecules including biological molecules, making the rational design of TMD-based sensors (including biosensors) difficult. This study focuses on the investigations of the fundamental interactions between proteins and two widely researched single-layered TMDs, MoS2, and WS2 using a combined study with linear vibrational spectroscopy attenuated total reflectance FTIR and nonlinear vibrational spectroscopy sum frequency generation vibrational spectroscopy, supplemented by molecular dynamics simulations. It was concluded that a large surface hydrophobic region in a relatively flat location on the protein surface is required for the protein to adsorb onto a monolayered MoS2 or WS2 surface with preferred orientation. No disulfide bond formation between cysteine groups on the protein and MoS2 or WS2 was found. The conclusions are general and can be used as guiding principles to engineer proteins to attach to TMDs. The approach adopted here is also applicable to study interactions between other 2D materials and biomolecules.
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