Article
Immunology
Jackson A. Campbell, Nicholas P. Cianciotto
Summary: This study reveals that Cas2 protein in Legionella pneumophila promotes intracellular infection and thermal tolerance through regulating the expression of HspC2 protein. These findings provide new insights into the noncanonical functions of CRISPR-Cas proteins.
INFECTION AND IMMUNITY
(2022)
Article
Microbiology
Breanne M. Head, Christopher I. Graham, Teassa MacMartin, Yoav Keynan, Ann Karen C. Brassinga
Summary: The incidence of Legionnaires' disease, caused by Legionella pneumophila, is increasing. Little is known about the >25 different Legionella spp. that can cause disease in humans, but the use of a GFP-expressing plasmid may be a viable approach for real-time investigation of these non-pneumophila Legionella strains.
Review
Medicine, General & Internal
Valeria Iliadi, Jeni Staykova, Sergios Iliadis, Ina Konstantinidou, Polina Sivykh, Gioulia Romanidou, Daniil F. Vardikov, Dimitrios Cassimos, Theocharis G. Konstantinidis
Summary: Legionella spp. is a potentially fatal bacterium that can cause pneumonia and can be transmitted through inhalation of aerosols. It can invade various organs and cause severe manifestations, including septic shock.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Biochemistry & Molecular Biology
Christopher I. Graham, Palak G. Patel, Jennifer R. Tanner, Jacqueline Hellinga, Teassa L. MacMartin, Georg Hausner, Ann Karen C. Brassinga
Summary: PsrA in Legionella pneumophila is a host-specific requirement for optimal temporal progression of the intracellular lifecycle in A. castellanii, affecting bacterial intracellular growth and transmissive cyst formation.
MOLECULAR MICROBIOLOGY
(2021)
Article
Microbiology
Ana Domazetovska, Slade O. Jensen, Matthew Gray, Michael Radzieta, Michael Maley
Summary: This study developed a CRISPR/Cas9-based targeted next-generation sequencing (NGS) method for direct sequencing of Legionella pneumophila from patient samples. The method was more efficient than whole-genome sequencing and accurately classified patients. This method has the potential to be widely applicable in microbial outbreak investigations.
MICROBIOLOGY SPECTRUM
(2022)
Article
Biochemistry & Molecular Biology
Joseph Saoud, Thangadurai Mani, Petra Rohrbach, Sebastien P. Faucher
Summary: Legionella pneumophila is a pathogenic bacterium causing severe pneumonia in humans. Its replication and virulence are influenced by host immune response, secretion system, and proteases.
CANADIAN JOURNAL OF MICROBIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Joseph Saoud, Thangadurai Mani, Petra Rohrbach, Sebastien P. Faucher
Summary: Legionella pneumophila is a Gram-negative bacterium that causes Legionnaires' disease. The bacterium replicates in water systems and amoebas/ciliates, and in humans it replicates in lung cells, causing severe pneumonia. The bacteria's ability to avoid host immune responses and its production of specific enzymes are crucial for its virulence.
CANADIAN JOURNAL OF MICROBIOLOGY
(2022)
Article
Immunology
Alberto E. E. Lopez, Lubov S. S. Grigoryeva, Armando Barajas, Nicholas P. P. Cianciotto
Summary: Previously, it was believed that the siderophore rhizoferrin secreted by Legionella pneumophila only played a role in extracellular survival. However, a new study found that both rhizoferrin-mediated ferric iron uptake and the ferrous iron transport pathway (FeoB) are critical for iron acquisition and intracellular infection by L. pneumophila.
INFECTION AND IMMUNITY
(2023)
Review
Biochemistry & Molecular Biology
Christopher T. D. Price, Yousef Abu Kwaik
Summary: The ubiquitin pathway is highly conserved and important in eukaryotic cells, with many intracellular bacterial pathogens targeting this pathway. Legionella pneumophila injects various ubiquitin-modifying enzymes into host cells to modulate ubiquitin-related processes, highlighting the evolution and importance of this pathway in pathogenesis.
Article
Biotechnology & Applied Microbiology
Joseph Saoud, Thangadurai Mani, Sebastien P. Faucher
Summary: Legionella pneumophila is often found in water systems, such as hot water distribution systems, and heat treatment is used to reduce its concentration. However, Lp quickly recolonizes these systems, indicating an efficient heat shock response. This study shows that the protease Tsp and the two-component system CpxRA are crucial for Lp's survival under thermal stress in water and within host cells.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Immunology
Stefanie M. Herbel, Lambert Moyon, Marvin Christ, Eslam M. Elsayed, Brian E. Caffrey, Silke Malmsheimer, Iwan Grin, Kerstin Hoffmann, Kristin Surmann, Sascha Blankenburg, Anna Lena Jung, Christina E. Herkt, Marco Borso, Beyza Bozdag, Axel Imhof, Anke Becker, Samuel Wagner, Gert Bange, Uwe Voelker, Wilhelm Bertrams, Annalisa Marsico, Bernd Schmeck
Summary: Legionella pneumophila is a common pathogen that causes pneumonia and it acquires eukaryote-like protein motifs that contribute to its pathogenicity. The study identified a bacterial factor, Smh1, with histone deacetylase activity that moderates host gene expression and promotes bacterial replication.
Article
Biotechnology & Applied Microbiology
Shayna R. Deecker, Malene L. Urbanus, Beth Nicholson, Alexander W. Ensminger
Summary: Legionella pneumophila, the causative agent of Legionnaires' disease, maintains active CRISPR-Cas defenses targeting an episomal element named Legionella mobile element 1 (LME-1). Additional LME-1 variants have been identified as well. Furthermore, CRISPR-Cas spacers with sequence similarity to microviruses within the Gokushovirinae subfamily have been found, suggesting recurrent encounters with these phages.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Immunology
Pei-Xing Xu, Hong-Yu Ren, Na Zhao, Xiao-Jing Jin, Bo-Hai Wen, Tian Qin
Summary: This study assessed the distribution characteristics of the CRISPR-Cas system in Legionella and explored its regulation using gene deletion mutants. The results showed that the Type II-B CRISPR-Cas system played a crucial role in regulating the virulence of L. pneumophila.
INFECTION AND IMMUNITY
(2023)
Article
Microbiology
Aurelien Croze, Antoine Carlino, Benjamin Quelard, Adeline Saha, Tiphaine Convert, Jean-Baptiste Eberst, Sandrine Demaneche
Summary: The study found that Legionella non-pneumophila (Lnp) strains interact differently with various amoebae when co-cultured at different temperatures. At lower temperatures, most Lnp strains, except for L. longbeachae, were phagocytosed by amoebae and unable to multiply intracellularly. At higher temperatures, some strains were able to hijack the machinery of amoebae for proliferation, but there were also specific amoebae that could prevent their growth.
Article
Engineering, Environmental
Muhammad Atif Nisar, Kirstin E. Ross, Melissa H. Brown, Richard Bentham, Jason Hinds, Harriet Whiley
Summary: This study reveals the widespread presence of free-living amoebae in Australian water systems and their significance as reservoirs of Legionella, highlighting a significant public health concern. Management protocols should incorporate measures to control amoebae and reduce the risk to end users.