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Budowa IV systemu sekrecji Legionella pneumophilai jego znaczenie w patogenezie Cover

Budowa IV systemu sekrecji Legionella pneumophilai jego znaczenie w patogenezie

Open Access
|Oct 2021

Abstract

Legionella pneumophila bacteria in the natural environment parasitize the cells of selected species of protozoa and, when present in artificial water distribution systems, they become an important etiological factor of pneumonia in humans. The main determinant of the pathogenicity of these bacteria is the capability to live and multiply in pulmonary macrophages, i.e. cells specialized in phagocytosis, killing, and digesting microorganisms. A prerequisite for the development of infection is the breakdown of the killing mechanisms of macrophages and the formation of the replication vacuole LCV (Legionella-containing vacuole). The biogenesis of the LCV vacuole is possible due to the efficient functioning of the IV secretion system Dot/Icm, which is a multi-protein complex located in the inner and outer membranes of the cell envelope. The Dot/Icm system consists of 27 components, including a core-transmembrane complex, which is the structural backbone of the entire system, and a complex of coupling proteins. Genes encoding the Dot/Icm system components are organized into two regions of the bacterial chromosome. The Dot/Icm secretion system enables L. pneumophila to introduce more than 300 effector proteins into the cytosol of the host cell, whose coordinated action maintains the integrity of the replication vacuole membrane and allows the manipulation of various cell processes. An important element of the intracellular multiplication strategy of L. pneumophila is the modulation of vesicular transport, interaction with the endoplasmic reticulum, and disruption of protein biosynthesis, autophagy, and apoptosis of the host cell. Understanding the complex mechanisms of regulation and function of the Dot/Icm effector proteins is critical in the prevention and treatment of Legionnaires' disease.

Language: English, Polish
Page range: 548 - 562
Submitted on: Sep 19, 2020
Accepted on: Feb 24, 2021
Published on: Oct 21, 2021
Published by: Hirszfeld Institute of Immunology and Experimental Therapy
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2021 Bożena Kowalczyk, Agata Małek, Marta Palusińska-Szysz, published by Hirszfeld Institute of Immunology and Experimental Therapy
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.