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Role of magnesium and a phagosomal P-type ATPase in intracellular bacterial killing.
MedLine Citation:
PMID:  21040356     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Bacterial ingestion and killing by phagocytic cells are essential processes to protect the human body from infectious microorganisms. However, only few proteins implicated in intracellular bacterial killing have been identified to date. We used Dictyostelium discoideum, a phagocytic bacterial predator, to study intracellular killing. In a random genetic screen we identified Kil2, a type V P-ATPase as an essential element for efficient intracellular killing of Klebsiella pneumoniae bacteria. Interestingly, kil2 knockout cells still killed efficiently several other species of bacteria, and did not show enhanced susceptibility to Mycobacterium marinum intracellular replication. Kil2 is present in the phagosomal membrane, and its structure suggests that it pumps cations into the phagosomal lumen. The killing defect of kil2 knockout cells was rescued by the addition of magnesium ions, suggesting that Kil2 may function as a magnesium pump. In agreement with this, kil2 mutant cells exhibited a specific defect for growth at high concentrations of magnesium. Phagosomal protease activity was lower in kil2 mutant cells than in wild-type cells, a phenotype reversed by the addition of magnesium to the medium. Kil2 may act as a magnesium pump maintaining magnesium concentration in phagosomes, thus ensuring optimal activity of phagosomal proteases and efficient killing of bacteria.
Authors:
Emmanuelle Lelong; Anna Marchetti; Aurélie Guého; Wanessa C Lima; Natascha Sattler; Maëlle Molmeret; Monica Hagedorn; Thierry Soldati; Pierre Cosson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-11-02
Journal Detail:
Title:  Cellular microbiology     Volume:  13     ISSN:  1462-5822     ISO Abbreviation:  Cell. Microbiol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883691     Medline TA:  Cell Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  246-58     Citation Subset:  IM    
Copyright Information:
© 2010 Blackwell Publishing Ltd.
Affiliation:
Département de Physiologie Cellulaire et Métabolisme, Faculté de Médecine de Genève, Centre Médical Universitaire, Geneva 4, Switzerland.
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