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Functional diversification of ROK-family transcriptional regulators of sugar catabolism in the Thermotogae phylum

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gks1184· OSTI ID:1904608
 [1];  [2];  [3];  [2];  [4]
  1. Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation); Sanford-Burnham Medical Research Inst., La Jolla, CA (United States)
  2. Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA (United States)
  3. Russian Academy of Sciences (RAS), Moscow (Russian Federation)
  4. Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation)
Large and functionally heterogeneous families of transcription factors have complex evolutionary histories. What shapes specificities toward effectors and DNA sites in paralogous regulators is a fundamental question in biology. Bacteria from the deep-branching lineage Thermotogae possess multiple paralogs of the repressor, open reading frame, kinase (ROK) family regulators that are characterized by carbohydrate-sensing domains shared with sugar kinases. We applied an integrated genomic approach to study functions and specificities of regulators from this family. A comparative analysis of 11 Thermotogae genomes revealed novel mechanisms of transcriptional regulation of the sugar utilization networks, DNA-binding motifs and specific functions. Reconstructed regulons for seven groups of ROK regulators were validated by DNA-binding assays using purified recombinant proteins from the model bacterium Thermotoga maritima. All tested regulators demonstrated specific binding to their predicted cognate DNA sites, and this binding was inhibited by specific effectors, mono- or disaccharides from their respective sugar catabolic pathways. By comparing ligand-binding domains of regulators with structurally characterized kinases from the ROK family, we elucidated signature amino acid residues determining sugar-ligand regulator specificity. Observed correlations between signature residues and the sugar-ligand specificities provide the framework for structure functional classification of the entire ROK family.
Research Organization:
Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA (United States); University of California, San Diego, CA (United States)
Sponsoring Organization:
Russian Academy of Sciences; Russian Foundation for Basic Research; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FG02-08ER64686; SC0004999
OSTI ID:
1904608
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 2 Vol. 41; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

A genome-wide approach for identification and characterisation of metabolite-inducible systems journal March 2020
Operator recognition by the ROK transcription factor family members, NagC and Mlc journal December 2014
RegPrecise 3.0 – A resource for genome-scale exploration of transcriptional regulation in bacteria journal January 2013
Polysaccharides utilization in human gut bacterium Bacteroides thetaiotaomicron: comparative genomics reconstruction of metabolic and regulatory networks journal January 2013
Simultaneous achievement of high ethanol yield and titer in Clostridium thermocellum journal June 2016
Transcriptional regulation of the carbohydrate utilization network in Thermotoga maritima journal January 2013
Comparative Genomics Reveals the Regulatory Complexity of Bifidobacterial Arabinose and Arabino-Oligosaccharide Utilization journal April 2018

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