Semisynthetic Nanoreactor for Reversible Single-Molecule Covalent Chemistry
Joongoo Lee1, Arnold J Boersma2, Marc A Boudreau3
1Department of Chemistry, University of Oxford , Oxford OX1 3TA, U.K.
ACS Nano
|August 19, 2016
Summary
Protein engineering created novel heptameric α-hemolysin (αHL) pores using native chemical ligation. This advancement enables studying reversible covalent chemistry at the single-molecule level within these engineered nanoreactors.
Area of Science:
- Biotechnology
- Protein Engineering
- Nanotechnology
Background:
- Protein pores like heptameric α-hemolysin (αHL) are engineered for biotechnological applications.
- Previous studies focused on cysteine chemistry or irreversible reactions in αHL nanoreactors.
- Expanding the chemical repertoire in αHL pores is crucial for advanced single-molecule studies.
Purpose of the Study:
- To engineer novel αHL pores using native chemical ligation (NCL) for single-molecule studies.
- To investigate the potential of NCL in creating complex protein structures for nanoreactors.
- To extend the application of αHL nanoreactors to reversible covalent chemistry.
Main Methods:
- Engineering of four distinct αHL pores by coupling two or three fragments via NCL.
- Folding of synthetic αHL monomers and incorporation into heptameric pores.
- Validation of pore functionality using hemolysis assays and single-channel current recording.
Main Results:
- Successful construction of four novel αHL pores through fragment condensation using NCL.
- Demonstration of functional heptameric pores formed from synthetic monomers.
- Extension of the nanoreactor approach to study reversible covalent chemistry using a ketone amino acid.
Conclusions:
- Native chemical ligation is a viable method for engineering complex protein pores like αHL.
- Engineered αHL pores can serve as functional nanoreactors for studying diverse chemical reactions.
- This work expands the scope of single-molecule chemistry investigations using protein nanopores.
