ArticleMicrobiology (Reading, England)2009
A type II secreted RNase of Legionella pneumophila facilitates optimal intracellular infection of Hartmannella vermiformis.
Article in Microbiology (Reading, England), 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.
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Who cites it
28 citing papers in PubMed, 43 citations in OpenAlex.
- Mucin stimulates the growth ofMicrobiology (Reading, England) · 2026Article
- Molecular evolution and adaptations ofFrontiers in cellular and infection microbiology · 2026Review
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- The Legionella pneumophila Dot/Icm Type IV Secretion System is Structurally and Functionally Resilient in Absence of Species-specific Proteins Dis2 and Dis3.Journal of molecular biology · 2025Article
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- InSeq analysis of definedmBio · 2024Article
- Protein sociology of ProA, Mip and other secreted virulence factors at theFrontiers in cellular and infection microbiology · 2023Review
- Pathogenicity and Virulence ofVirulence · 2021Review
- Article
- Review
- Type II Secretion Promotes Bacterial Growth within theInfection and immunity · 2019Article
- Assessing the impact, genomics and evolution of type II secretion across a large, medically important genus: the Legionella type II secretion paradigm.Microbial genomics · 2019Article
- Architecture, Function, and Substrates of the Type II Secretion System.EcoSal Plus · 2019Review
- Vermamoeba vermiformis: a Free-Living Amoeba of Interest.Microbial ecology · 2018Review
- Article
- Expanding Role of Type II Secretion in Bacterial Pathogenesis and Beyond.Infection and immunity · 2017Review
- Type II Secretion Is Necessary for Optimal Association of the Legionella-Containing Vacuole with Macrophage Rab1B but Enhances Intracellular Replication Mainly by Rab1B-Independent Mechanisms.Infection and immunity · 2016Article
- The novel Legionella pneumophila type II secretion substrate NttC contributes to infection of amoebae Hartmannella vermiformis and Willaertia magna.Microbiology (Reading, England) · 2014Article
- Human lung tissue explants reveal novel interactions during Legionella pneumophila infections.Infection and immunity · 2014Article
- Multiple Legionella pneumophila Type II secretion substrates, including a novel protein, contribute to differential infection of the amoebae Acanthamoeba castellanii, Hartmannella vermiformis, and Naegleria lovaniensis.Infection and immunity · 2013Article
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
Type II protein secretion plays a role in a wide variety of functions that are important for the ecology and pathogenesis of Legionella pneumophila. Perhaps most dramatic is the critical role that this secretion pathway has in L. pneumophila intracellular infection of aquatic protozoa. Recently, we showed that virulent L. pneumophila strain 130b secretes RNase activity through its type II secretion system. We now report the cloning and mutational analysis of the gene (srnA) encoding that novel type of secreted activity. The SrnA protein was defined as being a member of the T2 family of secreted RNases. Supernatants from mutants inactivated for srnA completely lacked RNase activity, indicating that SrnA is the major secreted RNase of L. pneumophila. Although srnA mutants grew normally in bacteriological media and human U937 cell macrophages, they were impaired in their ability to grow within Hartmannella vermiformis amoebae. This finding represents the second identification of a L. pneumophila type II effector being necessary for optimal intracellular infection of amoebae, with the first being the ProA zinc metalloprotease. Newly constructed srnA proA double mutants displayed an even larger infection defect that appeared to be the additive result of losing both SrnA and ProA. Overall, these data represent the first demonstration of a secreted RNase promoting an intracellular infection event, and support our long-standing hypothesis that the infection defects of L. pneumophila type II secretion mutants are due to the loss of multiple secreted effectors.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.