Abstract
AbstractProtein post-translational modifications (PTMs) play a crucial role in countless biological processes, profoundly modulating protein properties on both the spatial and temporal scales. Protein PTMs have also emerged as reliable biomarkers for several diseases. However, only a handful of techniques are available to accurately measure their levels, capture their complexity at a single molecule level and characterize their multifaceted roles in health and disease. Nanopore sensing provides high sensitivity for the detection of low-abundance proteins, holding the potential to impact single-molecule proteomics and PTM detection in particular. Here, we demonstrate the ability of a biological nanopore, the pore-forming toxin aerolysin, to detect and distinguish α-synuclein-derived peptides bearing single or multiple PTMs, namely phosphorylation, nitration and oxidation occurring at different positions and in various combinations. The characteristic current signatures of the α-synuclein peptide and its PTM variants could be confidently identified using a deep learning model for signal processing. We further demonstrate that this framework can quantify α-synuclein peptides at picomolar concentration and detect the C-terminal peptides generated by digestion of full-length α-synuclein. Collectively, our work highlights the unique advantage of using nanopore as a tool for simultaneous detection of multiple PTMs and paves the way for their use in biomarker discovery and diagnostics.
Publisher
Cold Spring Harbor Laboratory
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献