Real-time conformational changes and controlled orientation of native proteins inside a protein nanoreactor

Veerle Van Meervelt, Misha Soskine, Shubham Singh, Gea Schuurman-Wolters, Hein J Wijma, Bert Poolman, Giovanni Maglia

Research output: Contribution to journalArticleAcademicpeer-review

48 Citations (Scopus)
383 Downloads (Pure)

Abstract

Protein conformations play crucial roles in most, if not all, biological processes. Here we show that the current carried through a nanopore by ions allows monitoring conformational changes of native substrate-binding domains (SBD) of an ATP-Binding Cassette importer in real-time. Comparison with single-molecule Förster Resonance Energy Transfer (smFRET) and ensemble measurements revealed that proteins trapped inside the nanopore have bulk-like properties. Two ligand-free and two ligand-bound conformations of SBD proteins were inferred and their kinetic constants were determined. Remarkably, internalized proteins aligned with the applied voltage bias, and their orientation could be controlled by the addition of a single charge to the protein surface. Nanopores can thus be used to immobilize proteins on a surface with a specific orientation, and will be employed as nanoreactors for single-molecule studies of native proteins. Moreover, nanopores with internal protein adaptors might find further practical applications in multianalyte sensing devices.

Original languageEnglish
Article numberjacs.7b10106
Pages (from-to)18640-18646
Number of pages7
JournalJournal of the American Chemical Society
Volume139
Issue number51
Early online date5-Dec-2017
DOIs
Publication statusPublished - 5-Dec-2017

Keywords

  • protein nanoreactor
  • nanopores
  • conformation changes
  • native proteins
  • BIOLOGICAL NANOPORE
  • ENERGY LANDSCAPES
  • CLYA NANOPORE
  • BINDING
  • DYNAMICS
  • RECOGNITION
  • STABILITY
  • MECHANISM
  • RECEPTOR
  • CHANNEL

Cite this