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Extracellular self-assembly of functional and tunable protein conjugates from Bacillus subtilis

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Title: Extracellular self-assembly of functional and tunable protein conjugates from Bacillus subtilis
Authors: Gilbert, C
Howarth, M
Harwood, CR
Ellis, T
Item Type: Journal Article
Abstract: The ability to stably and specifically conjugate recombinant proteins to one another is a powerful approach for engineering multifunctional enzymes, protein therapeutics, and novel biological materials. While many of these applications have been illustrated through in vitro and in vivo intracellular protein conjugation methods, extracellular self-assembly of protein conjugates offers unique advantages: simplifying purification, reducing toxicity and burden, and enabling tunability. Exploiting the recently described SpyTag-SpyCatcher system, we describe here how enzymes and structural proteins can be genetically encoded to covalently conjugate in culture media following programmable secretion from Bacillus subtilis. Using this approach, we demonstrate how self-conjugation of a secreted industrial enzyme, XynA, dramatically increases its resilience to boiling, and we show that cellular consortia can be engineered to self-assemble functional protein–protein conjugates with tunable composition. This novel genetically encoded modular system provides a flexible strategy for protein conjugation harnessing the substantial advantages of extracellular self-assembly.
Issue Date: 23-Feb-2017
Date of Acceptance: 1-Feb-2017
URI: http://hdl.handle.net/10044/1/45032
DOI: https://dx.doi.org/10.1021/acssynbio.6b00292
ISSN: 2161-5063
Publisher: American Chemical Society
Start Page: 957
End Page: 967
Journal / Book Title: ACS Synthetic Biology
Volume: 6
Issue: 6
Copyright Statement: © 2017 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/J02175X/1
Keywords: SpyTag-SpyCatcher
extracellular self-assembly
microbial consortia
protein conjugation
Publication Status: Published
Appears in Collections:Bioengineering
Faculty of Engineering