A Canonical Biophysical Model of the CsrA Global Regulator Suggests Flexible Regulator-Target Interactions.

Abstract:

:Bacterial global post-transcriptional regulators execute hundreds of interactions with targets that display varying molecular features while retaining specificity. Herein, we develop, validate, and apply a biophysical, statistical thermodynamic model of canonical target mRNA interactions with the CsrA global post-transcriptional regulator to understand the molecular features that contribute to target regulation. Altogether, we model interactions of CsrA with a pool of 236 mRNA: 107 are experimentally regulated by CsrA and 129 are suspected interaction partners. Guided by current understanding of CsrA-mRNA interactions, we incorporate (i) mRNA nucleotide sequence, (ii) cooperativity of CsrA-mRNA binding, and (iii) minimization of mRNA structural changes to identify an ensemble of likely binding sites and their free energies. The regulatory impact of bound CsrA on mRNA translation is determined with the RBS calculator. Predicted regulation of 66 experimentally regulated mRNAs adheres to the principles of canonical CsrA-mRNA interactions; the remainder implies that other, diverse mechanisms may underlie CsrA-mRNA interaction and regulation. Importantly, results suggest that this global regulator may bind targets in multiple conformations, via flexible stretches of overlapping predicted binding sites. This novel observation expands the notion that CsrA always binds to its targets at specific consensus sequences.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Leistra AN,Gelderman G,Sowa SW,Moon-Walker A,Salis HM,Contreras LM

doi

10.1038/s41598-018-27474-2

subject

Has Abstract

pub_date

2018-07-02 00:00:00

pages

9892

issue

1

issn

2045-2322

pii

10.1038/s41598-018-27474-2

journal_volume

8

pub_type

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