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Ying, Yi-Lun; Long, Yi-Tao
Journal of the American Chemical Society, 10/2019, Volume: 141, Issue: 40Journal Article
Single-molecule measurements have greatly enhanced our understanding of living systems. Biological systems offer nanopores, a sub-class of membrane proteins, the well-defined confined space for accommodating a single molecule. The biological nanopore acts as a single-biomolecule interface for capturing and identifying a single molecule of interest, and thus it can be used as a single-molecule sensor. In this Perspective, we focus on biological nanopore-based single-biomolecule interfaces for single-biomolecule detection. First, we outline the design of the nanopore-based single-biomolecule interface, which provides rich stochastic information regarding each biomolecule. Next, we highlight future research directions beyond DNA sequencing, including detection of rare species, identification of hidden intermediates, spectral analysis of covalent/noncovalent interactions, and tracing of the dynamic pathways of single-biopolymer behaviors. The concept of a “single-molecule ionic spectrum” is discussed, which may allow mapping of noncovalent interactions at an atomic level in the future. We also discuss the challenges and goals for the future to make this measurement possible for addressing entirely new types of biological questions, which would be an exciting area of future research.
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