scholarly journals MntP and YiiP Contribute to Manganese Efflux in Salmonella enterica Serovar Typhimurium under Conditions of Manganese Overload and Nitrosative Stress

2022 ◽  
Author(s):  
Annie Ouyang ◽  
Kendall M. Gasner ◽  
Stephanie L. Neville ◽  
Christopher A. McDevitt ◽  
Elaine R. Frawley
Keyword(s):  
Transition Metal ◽  
Salmonella Enterica ◽  
Metal Ion ◽  
Nitrosative Stress ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Metal Cations ◽  
Transition Metal Cations ◽  
Bacterial Physiology ◽  
Area Of Interest ◽  
Serovar Typhimurium

Transition metal cations are required for the function of many proteins but can mediate toxicity when present in excess. Identifying transporters that facilitate metal ion export, the conditions under which they are expressed, and the role they play in bacterial physiology is an evolving area of interest for environmental and pathogenic organisms.

scholarly journals Effect of transition metal cations on commensurate freezing of n-hexane confined in micropores of ZSM-5

2015 ◽  
Vol 80 (10) ◽  
pp. 1297-1309
Author(s):  
Radmila Hercigonja ◽  
Vladislav Rac ◽  
Vesna Rakic ◽  
Aline Auroux
Keyword(s):  
Transition Metal ◽  
Metal Ion ◽  
Gas Adsorption ◽  
Practical Importance ◽  
Metal Cations ◽  
Transition Metal Cations ◽  
Transition Metal Ion ◽  
Charge Balancing ◽  
Modified Forms

Besides its importance concerning fundamental studies on gas adsorption in narrow pores, investigation of commensurate freezing of fluid within the zeolite is of practical importance in application of zeolite in the process of adsorption, separation and catalysis. In this work the adsorption of n-hexane on HZSM-5 and its transition metal ion-exchanged modified forms was studied at 303 K by means of microcalorimetry. The thermal molar entropies of adsorption were calculated and thus, the freezing like behaviour of n-hexane inside the structure of zeolite as a confinement media was noticed. This effect is governed by the attractive interactions between n-hexane molecules and the pore walls, and is also influenced by the length of the pores and the nature of charge-balancing cations. Among the investigated zeolites, solid like phase of n-hexane in the pores of zeolites with Fe2+ ions is the most like a solid n-hexane bulk, while the presence of Cu2+ ions contribute to the lowest ordering obtained solid like phase of n-hexane.

scholarly journals The Salmonella enterica Serovar Typhimurium Divalent Cation Transport Systems MntH and SitABCD Are Essential for Virulence in an Nramp1G169 Murine Typhoid Model

2004 ◽  
Vol 72 (9) ◽  
pp. 5522-5525 ◽  
Author(s):  
Michelle L. Zaharik ◽  
Vivian Li Cullen ◽  
Angela M. Fung ◽  
Stephen J. Libby ◽  
Sonya L. Kujat Choy ◽  
...  
Keyword(s):  
Salmonella Enterica ◽  
Metal Ion ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Divalent Cations ◽  
Systemic Infection ◽  
Transport Systems ◽  
Phagocytic Cells ◽  
Serovar Typhimurium ◽  
Genes Encoding ◽  
Metal Ion Uptake

ABSTRACT Nramp1 is a transporter that pumps divalent cations from the vacuoles of phagocytic cells and is associated with the innate resistance of mice to diverse intracellular pathogens. We demonstrate that sitA and mntH, genes encoding high-affinity metal ion uptake systems in Salmonella enterica serovar Typhimurium, are upregulated when Salmonella is internalized by Nramp1-expressing macrophages and play an essential role in systemic infection of congenic Nramp1-expressing mice.

scholarly journals Manganese import protects Salmonella enterica serovar Typhimurium against nitrosative stress

Metallomics ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1791-1801
Author(s):  
Shehla Yousuf ◽  
Joyce E. Karlinsey ◽  
Stephanie L. Neville ◽  
Christopher A. McDevitt ◽  
Stephen J. Libby ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Salmonella Enterica ◽  
Iron Uptake ◽  
Nitrosative Stress ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Serovar Typhimurium

In response to nitric oxide, Salmonella typhimurium acquires manganese and exports zinc, magnesium and iron. Uptake is driven by expression of transporters MntH and SitABCD as well as by ZupT.

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