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  Unravelling the complexity and redundancy of carbon catabolic repression in Pseudomonas fluorescens SBW25

Liu, Y., Gokhale, C. S., Rainey, P. B., & Zhang, X.-X. (2017). Unravelling the complexity and redundancy of carbon catabolic repression in Pseudomonas fluorescens SBW25. Molecular Microbiology, 105(4), 589-605. doi:10.1111/mmi.13720.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-26CC-F Version Permalink: http://hdl.handle.net/21.11116/0000-0005-1D04-7
Genre: Journal Article

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 Creators:
Liu, Yunhao, Author
Gokhale, Chaitanya S.1, Author              
Rainey, Paul B.2, Author              
Zhang, Xue-Xian, Author
Affiliations:
1Department Evolutionary Theory, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445641              
2Department Microbial Population Biology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_2421699              

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Free keywords: bacterial protein; messenger RNA; protein CbrAB; succinic acid; unclassified drug; untranslated RNA; xylose, Article; bacterial gene; catabolite repression; controlled study; crcY gene; crcZ gene; gene function; gene inactivation; hfq gene; mathematical model; mutagenesis; nonhuman; priority journal; protein RNA binding; Pseudomonas fluorescens; transcription initiation; transposon; xut gene
 Abstract: The two-component system CbrAB is the principal regulator for cellular metabolic balance in Pseudomonas fluorescens SBW25 and is necessary for growth on many substrates including xylose. To understand the regulatory linkage between CbrAB and genes for xylose utilization (xut), we performed transposon mutagenesis of ΔcbrB to select for Xut+ suppressors. This led to identification of crc and hfq. Subsequent genetic and biochemical analysis showed that Crc and Hfq are key mediators of succinate-provoked carbon catabolite repression (CCR). Specifically, Crc/Hfq sequentially bind to mRNAs of both the transcriptional activator and structural genes involved in xylose catabolism. However, in the absence of succinate, repression is relieved through competitive binding by two ncRNAs, CrcY and CrcZ, whose expression is activated by CbrAB. These findings provoke a model for CCR in which it is assumed that crc and hfq are functionally complementary, whereas crcY and crcZ are genetically redundant. Inactivation of either crcY or crcZ produced no effects on bacterial fitness in laboratory media, however, results of mathematical modelling predict that the co-existence of crcY and crcZ requires separate functional identity. Finally, we provide empirical evidence that CCR is advantageous in nutrient-complex environments where preferred carbon sources are present at high concentrations but fluctuate in their availability. © 2017 John Wiley Sons Ltd

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Language(s): eng - English
 Dates: 2017-05-242017-06-192017-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1111/mmi.13720
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Title: Molecular Microbiology
  Other : Mol. Microbiol.
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 105 (4) Sequence Number: - Start / End Page: 589 - 605 Identifier: ISSN: 0950-382X
CoNE: /journals/resource/954925574950