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Title: Topology effects on protein–polymer block copolymer self-assembly

Journal Article · · Polymer Chemistry
DOI:https://doi.org/10.1039/C8PY01228H· OSTI ID:1497923
 [1]; ORCiD logo [2]
  1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, USA, Yokkaichi Research Center
  2. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, USA

Bioconjugates made of the model red fluorescent protein mCherry and synthetic polymer blocks show that topology, i.e. the BA, BA2, ABA and ABC chain structure of the block copolymers, where B represents the protein and A and C represent polymers, has a significant effect on ordering transitions and the type and size of nanostructures formed during microphase separation. ABA and ABC type block copolymers were synthesized by using two site-specific bioconjugation reactions: the thiol–ene reaction with a cysteine on mCherry and maleimide functionalized polymers, and the sortase A ligation reaction with an LPETG sequence at the C-terminus on mCherry and a triglycine functionalized polymer. The phase behaviors of mCherry–poly(N-isopropylacrylamide) (PNIPAM) and mCherry–(PNIPAM)2 show that the shapes of the phase diagrams are similar overall, but mCherry–(PNIPAM)2, i.e. BA2 type, yields a narrower domain spacing than mCherry–PNIPAM, i.e. BA type. PNIPAM–mCherry–PNIPAM (ABA type) shows only lamellar phases in the range of conditions under which ordered structures appear. PDMAPS–mCherry–PNIPAM (ABC type) shows an ordered structure across the widest range of conditions in the four bioconjugates and also the widest range of different nanodomain structures. The phase behavior of the ABC type implies that the repulsive interaction between two water-soluble coil polymers can be a key factor in enhancing the self-assembly of globular protein–polymer block copolymers.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
DOE-SC0007106; SC0007106
OSTI ID:
1497923
Alternate ID(s):
OSTI ID: 1610937
Journal Information:
Polymer Chemistry, Journal Name: Polymer Chemistry Vol. 10 Journal Issue: 14; ISSN 1759-9954
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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