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Single-molecule peptide fingerprinting.


ABSTRACT: Proteomic analyses provide essential information on molecular pathways of cellular systems and the state of a living organism. Mass spectrometry is currently the first choice for proteomic analysis. However, the requirement for a large amount of sample renders a small-scale proteomics study challenging. Here, we demonstrate a proof of concept of single-molecule FRET-based protein fingerprinting. We harnessed the AAA+ protease ClpXP to scan peptides. By using donor fluorophore-labeled ClpP, we sequentially read out FRET signals from acceptor-labeled amino acids of peptides. The repurposed ClpXP exhibits unidirectional processing with high processivity and has the potential to detect low-abundance proteins. Our technique is a promising approach for sequencing protein substrates using a small amount of sample.

SUBMITTER: van Ginkel J 

PROVIDER: S-EPMC5879649 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Single-molecule peptide fingerprinting.

van Ginkel Jetty J   Filius Mike M   Szczepaniak Malwina M   Tulinski Pawel P   Meyer Anne S AS   Joo Chirlmin C  

Proceedings of the National Academy of Sciences of the United States of America 20180312 13


Proteomic analyses provide essential information on molecular pathways of cellular systems and the state of a living organism. Mass spectrometry is currently the first choice for proteomic analysis. However, the requirement for a large amount of sample renders a small-scale proteomics study challenging. Here, we demonstrate a proof of concept of single-molecule FRET-based protein fingerprinting. We harnessed the AAA+ protease ClpXP to scan peptides. By using donor fluorophore-labeled ClpP, we se  ...[more]

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