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Relevant bibliographies by topics / Shigella flexneri. Iron

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Journal articles
Dissertations / Theses

Academic literature on the topic 'Shigella flexneri. Iron'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Shigella flexneri. Iron"

1

Runyen-Janecky, L. J., S. A. Reeves, E. G. Gonzales, and S. M. Payne. "Contribution of the Shigella flexneri Sit, Iuc, and Feo Iron Acquisition Systems to Iron Acquisition In Vitro and in Cultured Cells." Infection and Immunity 71, no. 4 (2003): 1919–28. http://dx.doi.org/10.1128/iai.71.4.1919-1928.2003.

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ABSTRACT Shigella flexneri possesses multiple iron acquisition systems, including proteins involved in the synthesis and uptake of siderophores and the Feo system for ferrous iron utilization. We identified an additional S. flexneri putative iron transport gene, sitA, in a screen for S. flexneri genes that are induced in the eukaryotic intracellular environment. sitA was present in all Shigella species and in most enteroinvasive Escherichia coli strains but not in any other E. coli isolates tested. The sit locus consists of four genes encoding a potential ABC transport system. The deduced amin

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2

Boulette, Megan L., and Shelley M. Payne. "Anaerobic Regulation of Shigella flexneri Virulence: ArcA Regulates fur and Iron Acquisition Genes." Journal of Bacteriology 189, no. 19 (2007): 6957–67. http://dx.doi.org/10.1128/jb.00621-07.

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ABSTRACT Invasion and plaque formation in epithelial monolayers are routinely used to assess the virulence of Shigella flexneri, a causative agent of dysentery. A modified plaque assay was developed to identify factors contributing to the virulence of S. flexneri under the anaerobic conditions present in the colon. This assay demonstrated the importance of the ferrous iron transport system Feo, as well as the global transcription factors Fur, ArcA, and Fnr, for Shigella plaque formation in anoxic environments. Transcriptional analyses of S. flexneri iron transport genes indicated that anaerobi

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3

Fisher, Carolyn R., Nicola M. L. L. Davies, Elizabeth E. Wyckoff, Zhengyu Feng, Edwin V. Oaks, and Shelley M. Payne. "Genetics and Virulence Association of the Shigella flexneri Sit Iron Transport System." Infection and Immunity 77, no. 5 (2009): 1992–99. http://dx.doi.org/10.1128/iai.00064-09.

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ABSTRACT The sit-encoded iron transport system is present within pathogenicity islands in all Shigella spp. and some pathogenic Escherichia coli strains. The islands contain numerous insertion elements and sequences with homology to bacteriophage genes. The Shigella flexneri sit genes can be lost as a result of deletion within the island. The formation of deletions was dependent upon RecA and occurred at relatively high frequency. This suggests that the sit region is inherently unstable, yet sit genes are maintained in all of the clinical isolates tested. Characterization of the sitABCD genes

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Luck, Shelley N., Sally A. Turner, Kumar Rajakumar, Harry Sakellaris, and Ben Adler. "Ferric Dicitrate Transport System (Fec) of Shigella flexneri 2a YSH6000 Is Encoded on a Novel Pathogenicity Island Carrying Multiple Antibiotic Resistance Genes." Infection and Immunity 69, no. 10 (2001): 6012–21. http://dx.doi.org/10.1128/iai.69.10.6012-6021.2001.

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ABSTRACT Iron uptake systems which are critical for bacterial survival and which may play important roles in bacterial virulence are often carried on mobile elements, such as plasmids and pathogenicity islands (PAIs). In the present study, we identified and characterized a ferric dicitrate uptake system (Fec) in Shigella flexneriserotype 2a that is encoded by a novel PAI termed theShigella resistance locus (SRL) PAI. Thefec genes are transcribed in S. flexneri, and complementation of a fec deletion inEscherichia coli demonstrated that they are functional. However, insertional inactivation of f

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5

Runyen-Janecky, Laura, Aaron Daugherty, Benjamin Lloyd, Christopher Wellington, Haig Eskandarian, and Matthew Sagransky. "Role and Regulation of Iron-Sulfur Cluster Biosynthesis Genes in Shigella flexneri Virulence." Infection and Immunity 76, no. 3 (2008): 1083–92. http://dx.doi.org/10.1128/iai.01211-07.

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ABSTRACT Shigella flexneri, a causative agent of bacterial dysentery, possesses two predicted iron-sulfur cluster biosynthesis systems called Suf and Isc. S. flexneri strains containing deletion mutations in the entire suf operon (UR011) or the iscSUA genes (UR022) were constructed. Both mutants were defective in surviving exposure to oxidative stress. The suf mutant showed growth that was comparable to that of the parental strain in both iron-replete and iron-limiting media; however, the isc mutant showed reduced growth, relative to the parental strain, in both media. Although the suf mutant

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Runyen-Janecky, Laura, Ellyn Dazenski, Stephanie Hawkins, and Lisa Warner. "Role and Regulation of the Shigella flexneri Sit and MntH Systems." Infection and Immunity 74, no. 8 (2006): 4666–72. http://dx.doi.org/10.1128/iai.00562-06.

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ABSTRACT Shigella flexneri possesses at least two putative high-affinity manganese acquisition systems, SitABCD and MntH. Mutations in the genes encoding the components of both of these systems were constructed in S. flexneri. The sitA mntH mutant showed reduced growth, relative to the wild type, in Luria broth (L broth) containing the divalent metal chelator ethylene diamino-o-dihydroxyphenyl acetic acid, and the addition of either iron or manganese restored growth to the level of the wild-type strain. Although the sitA mntH mutant was not defective in surviving exposure to superoxide generat

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7

Runyen-Janecky, L. J., and S. M. Payne. "Identification of Chromosomal Shigella flexneri Genes Induced by the Eukaryotic Intracellular Environment." Infection and Immunity 70, no. 8 (2002): 4379–88. http://dx.doi.org/10.1128/iai.70.8.4379-4388.2002.

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ABSTRACT Upon entry into the eukaryotic cytosol, the facultative intracellular bacterium Shigella flexneri is exposed to an environment that may necessitate the expression of particular genes for it to survive and grow intracellularly. To identify genes that are induced in response to the intracellular environment, we screened a library containing fragments of the S. flexneri chromosome fused to a promoterless green fluorescent protein gene (gfp). Bacteria containing promoter fusions that had a higher level of gfp expression when S. flexneri was intracellular (in Henle cells) than when S. flex

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8

Lozano Aguirre, Luis Fernando, Juan Carlos Salazar, José Ignacio Vásquez, and Víctor Antonio García-Angulo. "Interdependency of regulatory effects of iron and riboflavin in the foodborne pathogen Shigella flexneri determined by integral transcriptomics." PeerJ 8 (September 15, 2020): e9553. http://dx.doi.org/10.7717/peerj.9553.

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Shigella flexneri is the causative agent of dysentery. For pathogens, iron is a critical micronutrient as its bioavailability is usually low in bacterial niches. This metal is involved in critical physiological processes mainly as a component of important metabolic molecules involved in redox reactions. Usually bacteria respond to fluctuations in iron availability to regulate iron acquisition and other iron-related functions. Recently the close metabolic feedback between iron and riboflavin, another pivotal biological redox agent, began to draw attention in bacteria. This is a widespread biolo

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9

Lucchini, Sacha, Hong Liu, Qi Jin, Jay C. D. Hinton, and Jun Yu. "Transcriptional Adaptation of Shigella flexneri during Infection of Macrophages and Epithelial Cells: Insights into the Strategies of a Cytosolic Bacterial Pathogen." Infection and Immunity 73, no. 1 (2005): 88–102. http://dx.doi.org/10.1128/iai.73.1.88-102.2005.

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ABSTRACT Shigella flexneri, the etiologic agent of bacillary dysentery, invades epithelial cells as well as macrophages and dendritic cells and escapes into the cytosol soon after invasion. Dissection of the global gene expression profile of the bacterium in its intracellular niche is essential to fully understand the biology of Shigella infection. We have determined the complete gene expression profiles for S. flexneri infecting human epithelial HeLa cells and human macrophage-like U937 cells. Approximately one quarter of the S. flexneri genes showed significant transcriptional adaptation dur

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Mey, Alexandra R., Elizabeth E. Wyckoff, Lindsey A. Hoover, Carolyn R. Fisher, and Shelley M. Payne. "Vibrio cholerae VciB Promotes Iron Uptake via Ferrous Iron Transporters." Journal of Bacteriology 190, no. 17 (2008): 5953–62. http://dx.doi.org/10.1128/jb.00569-08.

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ABSTRACT Vibrio cholerae uses a variety of strategies for obtaining iron in its diverse environments. In this study we report the identification of a novel iron utilization protein in V. cholerae, VciB. The vciB gene and its linked gene, vciA, were isolated in a screen for V. cholerae genes that permitted growth of an Escherichia coli siderophore mutant in low-iron medium. The vciAB operon encodes a predicted TonB-dependent outer membrane receptor, VciA, and a putative inner membrane protein, VciB. VciB, but not VciA, was required for growth stimulation of E. coli and Shigella flexneri strains

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Dissertations / Theses on the topic "Shigella flexneri. Iron"

1

Luck, Shelley Narelle. "The SRL pathogenicity island of Shigella flexneri 2a YSH6000." Monash University, Dept. of Microbiology, 2003. http://arrow.monash.edu.au/hdl/1959.1/9549.

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Davies, Nicola Mary Lisa. "Iron acquisition by Shigella dysenteriae and Shigella flexneri." Thesis, 2006. http://hdl.handle.net/2152/2711.

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Oglesby, Amanda Gail. "Iron regulation of acid resistance in Shigella flexneri." Thesis, 2005. http://hdl.handle.net/2152/2326.

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Boulette, Megan Leigh 1975. "Shigella flexneri ArcA and Fnr regulate iron acquisition and contribute to plaque formation under anaerobic conditions." Thesis, 2007. http://hdl.handle.net/2152/3195.

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Shigella flexneri is a Gram negative, intracellular pathogen responsible for bacillary dysentery in humans. To achieve infection of the human colonic epithelium, S. flexneri must adapt to varying environmental conditions, including fluctuations in pH, osmolarity, and nutrient and oxygen availabilities. The plaque assay is commonly used to measure the ability of S. flexneri to invade epithelial cells, grow intracellularly, and spread intercellularly to adjacent cells. However, as traditionally performed, this assay is of limited use in testing the virulence of Shigella in response to many of

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5

Ma, Li doctor of cellular and molecular biology. "Cellular iron metabolism and reductase systems in Escherichia coli and Shigella flexneri." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6160.

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The ability to acquire sufficient iron from the environment is essential for growth of most bacteria, including Escherichia coli and Shigella flexneri. In E. coli, the enterobactin-mediated iron acquisition system is the major way for the cells to get iron under iron-limiting conditions. Enterobactin is a siderophore that is synthesized and secreted in response to iron limitation to scavenge external ferric iron with high affinity. In this work, I showed that the alkyl hydroperoxide reductase (Ahp) system participates in cellular iron metabolism in both E. coli and S. flexneri. The Ahp system

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