Burden-driven feedback control of gene expression

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Title: Burden-driven feedback control of gene expression
Authors: Ceroni, F
Furini, S
Gorochowski, T
Boo, A
Borkowski, O
Ladak, Y
Awan, A
Gilbert, C
Stan, G-B
Ellis, T
Item Type: Journal Article
Abstract: Cells use feedback regulation to ensure robust growth despite fluctuating demands for resources and differing environmental conditions. However, the expression of foreign proteins from engineered constructs is an unnatural burden that cells are not adapted for. Here we combined RNA-seq with an in vivo assay to identify the major transcriptional changes that occur in Escherichia coli when inducible synthetic constructs are expressed. We observed that native promoters related to the heat-shock response activated expression rapidly in response to synthetic expression, regardless of the construct. Using these promoters, we built a dCas9-based feedback-regulation system that automatically adjusts the expression of a synthetic construct in response to burden. Cells equipped with this general-use controller maintained their capacity for native gene expression to ensure robust growth and thus outperformed unregulated cells in terms of protein yield in batch production. This engineered feedback is to our knowledge the first example of a universal, burden-based biomolecular control system and is modular, tunable and portable.
Issue Date: 20-Aug-2017
Date of Acceptance: 1-Aug-2017
Publisher: Cold Spring Harbor Laboratory
Start Page: 387
End Page: 393
Journal / Book Title: BioRxiv
Copyright Statement: The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-ND 4.0 International license.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/J021849/1
Publication Status: Published
Appears in Collections:Faculty of Engineering
Chemical Engineering

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