Abstract
The precise assembly and engineering of molecular machines capable of handling biomolecules play crucial roles in most single-molecule methods. In this work we use components from all three domains of life to fabricate an integrated multiprotein complex that controls the unfolding and threading of individual proteins across a nanopore. This 900 kDa multicomponent device was made in two steps. First, we designed a stable and low-noise β-barrel nanopore sensor by linking the transmembrane region of bacterial protective antigen to a mammalian proteasome activator. An archaeal 20S proteasome was then built into the artificial nanopore to control the unfolding and linearized transport of proteins across the nanopore. This multicomponent molecular machine opens the door to two approaches in single-molecule protein analysis, in which selected substrate proteins are unfolded, fed to into the proteasomal chamber and then addressed either as fragmented peptides or intact polypeptides.
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Data availability
All relevant data are included in the article and its Supplementary Information. Statistical source data, unmodified gels, and molecular dynamics simulations results are provided in Source data. Data is also available from the authors upon reasonable request. Source data are provided with this paper.
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Acknowledgements
This work is financially supported by ERC consolidator grant (no. 726151).
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Authors and Affiliations
Contributions
S.Z. and G.M. designed the experiments. G.M. supervised the project. S.Z. performed the experiments and data analysis. B.M.H.B., P.C.T.d.S. and S.-J.M. conducted the simulation work. G.M. and S.Z. wrote the paper. All authors discussed the results, and commented on the manuscript.
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Competing interests
G.M. is a founder, director and shareholder of Portal Biotech Limited, a company engaged in the development of nanopore technologies. This work was not supported by Portal Biotech Limited.
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Peer review information Nature Chemistry thanks Ulrich Keyser, Yi-Lun Ying and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Supplementary information
Supplementary Information
Additional discussion, methods, Supplementary Figs. 1–29, Table 1 and references.
Supplementary Data 1
molecular dynamics simulations of REG–nanopore for Fig. 1d.
Supplementary Data 2
molecular dynamics simulations of proteasome–nanopore for Fig. 1h.
Supplementary Data 3
Statistical Source Data for Supplementary Fig. 7.
Supplementary Data 4
Statistical Source Data for Supplementary Fig. 28.
Supplementary Data
Unprocessed gels.
Source data
Source Data Fig. 3
Statistical Source Data.
Source Data Fig. 4
Unprocessed gels.
Source Data Fig. 5
Statistical Source Data.
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Zhang, S., Huang, G., Versloot, R.C.A. et al. Bottom-up fabrication of a proteasome–nanopore that unravels and processes single proteins. Nat. Chem. 13, 1192–1199 (2021). https://doi.org/10.1038/s41557-021-00824-w
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DOI: https://doi.org/10.1038/s41557-021-00824-w
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