Transcriptional kinetic synergy: A complex landscape revealed by integrating modeling and synthetic biology

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Transcription factors (TFs) control gene expression, often acting synergistically. Classical thermodynamic models offer a biophysical explanation for synergy based on binding cooperativity and regulated recruitment of RNA polymerase. Because transcription requires polymerase to transition through multiple states, recent work suggests that "kinetic synergy"can arise through TFs acting on distinct steps of the transcription cycle. These types of synergy are not mutually exclusive and are difficult to disentangle conceptually and experi-mentally. Here, we model and build a synthetic circuit in which TFs bind to a single shared site on DNA, such that TFs cannot synergize by simultaneous binding. We model mRNA production as a function of both TF binding and regulation of the transcription cycle, revealing a complex landscape dependent on TF concentration, DNA binding affinity, and regulatory activity. We use synthetic TFs to confirm that the tran-scription cycle must be integrated with recruitment for a quantitative understanding of gene regulation.
Publisher
CELL PRESS
Issue Date
2023-04
Language
English
Article Type
Article
Citation

CELL SYSTEMS, v.14, no.4, pp.324 - 339

ISSN
2405-4712
DOI
10.1016/j.cels.2023.02.003
URI
http://hdl.handle.net/10203/307065
Appears in Collection
BS-Journal Papers(저널논문)
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