Self-assembly of temperature-responsive protein–polymer bioconjugates
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2015-09-16Rights
© 2015 The Authors. This is an Open Access article distributed under the Creative Commons CC-BY license (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html)Peer-Reviewed
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We report a simple temperature-responsive bioconjugate system comprising superfolder green fluorescent protein (sfGFP) decorated with poly[(oligo ethylene glycol) methyl ether methacrylate] (PEGMA) polymers. We used amber suppression to site-specifically incorporate the non-canonical azide-functional amino acid p-azidophenylalanine (pAzF) into sfGFP at different positions. The azide moiety on modified sfGFP was then coupled using copper-catalyzed “click” chemistry with the alkyne terminus of a PEGMA synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. The protein in the resulting bioconjugate was found to remain functionally active (i.e., fluorescent) after conjugation. Turbidity measurements revealed that the point of attachment of the polymer onto the protein scaffold has an impact on the thermoresponsive behavior of the resultant bioconjugate. Furthermore, small-angle X-ray scattering analysis showed the wrapping of the polymer around the protein in a temperature-dependent fashion. Our work demonstrates that standard genetic manipulation combined with an expanded genetic code provides an easy way to construct functional hybrid biomaterials where the location of the conjugation site on the protein plays an important role in determining material properties. We anticipate that our approach could be generalized for the synthesis of complex functional materials with precisely defined domain orientation, connectivity, and composition.Version
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Moatsou D, Li J, Ranji A, Pitto-Barry A et al (2015) Self-assembly of temperatureresponsive protein–polymer bioconjugates. Bioconjugate Chemistry. 26(9): 1890-1899.Link to Version of Record
https://doi.org/10.1021/acs.bioconjchem.5b00264Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1021/acs.bioconjchem.5b00264