ja6b10231_si_001.pdf (3.79 MB)
Near-Quantitative Aqueous Synthesis of Rotaxanes via Bioconjugation to Oligopeptides and Proteins
journal contribution
posted on 2016-11-08, 00:00 authored by Carson
J. Bruns, Hanwei Liu, Matthew B. FrancisIn spite of widespread
interest in rotaxane-based molecular machines
and materials, rotaxanes have not been attached covalently to proteins.
We describe the near-quantitative aqueous synthesis of [2]rotaxanes
based on neutral and charged aqueous hostscucurbit[7]uril
(CB7) and cyclobis(paraquat-p-phenylene) (CBPQT4+), respectivelyusing the thiol-ene addition of cysteine
and maleimide as a stoppering protocol. After verifying the high efficiency
of the reaction using glutathione (GSH) as an oligopeptide stopper,
we have employed cytochrome C (CytC) as a protein stopper to produce
the first well-characterized protein-rotaxane bioconjugates. We anticipate
that this methodology will enable the preparation of novel materials
that combine the unique properties of proteins and mechanical bonds.