Abstract
The csgD gene codes for the regulatory protein CsgD. CsgD upregulates the synthesis of the adhesive fimbriae, curli, that are important for biofilm formation and downregulates flagellar synthesis. We compared the expression of genes involved in folate metabolism and a gene (hmp) in strains with an intact csgD gene and with a deletion in csgD. The hmp gene codes a flavohemoglobin that inactivates nitric oxide. Expression was monitored by measuring light production from single copy lux operon fusions. At late times of growth, expression of genes responsible for methylene tetrahydrofolate synthesis (glyA and gcvTHP) and formyltetrahydrofolate recycling (purU) was higher in cells with CsgD than those without. In contrast, expression of hmp was lower in the presence of CsgD throughout the period monitored. We used a novel defined medium which should assist in defining nutritional factors that contribute to curli formation.
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Acknowledgments
This research was supported by a Discovery Grant (6727) awarded to M. B. H. by the Natural Sciences and Engineering Council of Canada. We thank the Centre for Structural and Functional Genomics, Concordia University for providing equipment that facilitated this research. We thank the following students who participated in this research: Amanda Beyde, Di Han, Stephanie Little, Tara MacRae, Pegah Malekazari, Jonas Morel, Cédric Nemers, Guillaume Sescousse, Jamieson Thompson-Tevendale, and Cristina Yuntas Yanes. We also thank the researchers who provided us with strains and plasmids. M. B. H. thanks Concordia University for an interesting career.
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Communicated by Jorge Membrillo-Hernández.
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Herrington, M.B., Sitaras, C. The influence of CsgD on the expression of genes of folate metabolism and hmp in Escherichia coli K-12. Arch Microbiol 195, 559–569 (2013). https://doi.org/10.1007/s00203-013-0909-3
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DOI: https://doi.org/10.1007/s00203-013-0909-3