Research Topics
| Matthias HornSummaryAffiliation: University of Vienna Country: Austria Publications
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Detail Information
Publications
Bacterial endosymbionts of free-living amoebaeMatthias Horn
Division of Microbial Ecology, Institute of Ecology and Conservation Biology, University of Vienna, Althanstr 14, 1090 Vienna, Austria
J Eukaryot Microbiol 51:509-14. 2004..Furthermore, phylogenetic analysis suggested that these mechanisms have been evolved by the ancestor of these amoeba symbionts in interplay with ancient unicellular eukaryotes...
Chlamydiae as symbionts in eukaryotesMatthias Horn
Department of Microbial Ecology, University of Vienna, A 1090 Vienna, Austria
Annu Rev Microbiol 62:113-31. 2008..Their analysis has contributed to a broader understanding of chlamydial biology and to novel insights into the evolution of these unique microorganisms...- Illuminating the evolutionary history of chlamydiaeMatthias Horn
Department of Microbial Ecology, Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
Science 304:728-30. 2004..Ancient chlamydiae appear to be the originators of mechanisms for the exploitation of eukaryotic cells... 
Diversity of bacterial endosymbionts of environmental acanthamoeba isolatesStephan Schmitz-Esser
Department of Microbial Ecology, University of Vienna, Althanstr 14, 1090 Vienna, Austria
Appl Environ Microbiol 74:5822-31. 2008..This study provides evidence for the existence of only a small number of phylogenetically well-separated groups of obligate intracellular endosymbionts of acanthamoebae with global distribution...- Proteomic analysis reveals a virtually complete set of proteins for translation and energy generation in elementary bodies of the amoeba symbiont Protochlamydia amoebophilaBarbara S Sixt
Department of Microbial Ecology, University of Vienna, Vienna, Austria
Proteomics 11:1868-92. 2011..amoebophila exploits its additional genetic repertoire (compared with the Chlamydiaceae), and that its elementary bodies are remarkably well equipped with proteins involved in transcription, translation, and energy generation... - High genetic similarity between two geographically distinct strains of the sulfur-oxidizing symbiont 'Candidatus Thiobios zoothamnicoli'Christian Rinke
Department of Marine Biology, University of Vienna, Vienna, Austria
FEMS Microbiol Ecol 67:229-41. 2009..niveum with Cand. Thiobios zoothamnicoli is very specific as well as temporally and spatially stable... - The genome of the amoeba symbiont "Candidatus Amoebophilus asiaticus" reveals common mechanisms for host cell interaction among amoeba-associated bacteriaStephan Schmitz-Esser
Department of Microbial Ecology, University of Vienna, Vienna, Austria
J Bacteriol 192:1045-57. 2010.... - Lawsonia intracellularis contains a gene encoding a functional rickettsia-like ATP/ADP translocase for host exploitationStephan Schmitz-Esser
Universitat Wien, Department für Mikrobielle Okologie, Althanstr 14, A 1090 Vienna, Austria
J Bacteriol 190:5746-52. 2008..The occurrence of an ATP/ADP translocase in L. intracellularis is explained by a relatively recent horizontal gene transfer event with rickettsiae as donors... - Unity in variety--the pan-genome of the ChlamydiaeAstrid Collingro
Department of Microbial Ecology, University of Vienna, Vienna, Austria
Mol Biol Evol 28:3253-70. 2011.... - Bacteriocyte-associated gammaproteobacterial symbionts of the Adelges nordmannianae/piceae complex (Hemiptera: Adelgidae)Elena R Toenshoff
Department of Microbial Ecology, University of Vienna, Vienna, Austria
ISME J 6:384-96. 2012..adelgidicola' is an evolutionarily young bacteriocyte-associated symbiont, which has been acquired after diversification of adelgids from their aphid sister group... - 'Candidatus Protochlamydia amoebophila', an endosymbiont of Acanthamoeba sppAstrid Collingro
Department of Microbial Ecology, University of Vienna, 1090 Vienna, Austria
Int J Syst Evol Microbiol 55:1863-6. 2005..8%, respectively), observed in this analysis justify its classification in a new genus. Therefore, the name 'Candidatus Protochlamydia amoebophila' is proposed for the designation of the Acanthamoeba sp. symbiont UWE25 (=ATCC PRA-7)... - "Candidatus Thiobios zoothamnicoli," an ectosymbiotic bacterium covering the giant marine ciliate Zoothamnium niveumChristian Rinke
Department of Marine Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
Appl Environ Microbiol 72:2014-21. 2006..The taxonomic status "Candidatus Thiobios zoothamnicoli" is proposed for the ectosymbiont of Z. niveum based on its ultrastructure, its 16S rRNA gene, the intergenic spacer region, and its partial 23S rRNA gene sequence... - An Acanthamoeba sp. containing two phylogenetically different bacterial endosymbiontsEva Heinz
Department of Microbial Ecology, Faculty of Life Sciences, University of Vienna, A 1090 Vienna, Austria
Environ Microbiol 9:1604-9. 2007..Further analysis of this stable relationship should provide novel insights into the complex interactions of intracellular multiple-partner associations... - Nucleotide parasitism by Simkania negevensis (Chlamydiae)Silvia Knab
Department of Microbial Ecology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
J Bacteriol 193:225-35. 2011..Although similar to other chlamydiae, these transporters show distinct and unique adaptations with respect to substrate specificities and mode of transport... - ATP/ADP translocases: a common feature of obligate intracellular amoebal symbionts related to Chlamydiae and RickettsiaeStephan Schmitz-Esser
Abteilung Mikrobielle Okologie, Universitat Wien, A 1090 Vienna, Austria
J Bacteriol 186:683-91. 2004.... - Comprehensive in silico prediction and analysis of chlamydial outer membrane proteins reflects evolution and life style of the ChlamydiaeEva Heinz
Department of Microbial Ecology, Faculty of Life Sciences, University of Vienna, Vienna, Austria
BMC Genomics 10:634. 2009..k.a. Chlamydophila) pneumoniae, Chlamydia (a.k.a. Chlamydophila) caviae, and Protochlamydia amoebophila... - Chlamydia-like bacteria in respiratory samples of community-acquired pneumonia patientsSusanne Haider
Department of Microbial Ecology, University of Vienna, Althanstrasse, Vienna, Austria
FEMS Microbiol Lett 281:198-202. 2008..This study extends previous findings suggesting an association of Chlamydia-like bacteria with respiratory disease, but a causal link between these microorganisms and respiratory tract infections has yet to be established... - The genome of the amoeba symbiont "Candidatus Amoebophilus asiaticus" encodes an afp-like prophage possibly used for protein secretionThomas Penz
Department of Microbial Ecology, University of Vienna, Wien, Austria
Virulence 1:541-5. 2010..In S. entomophila this system is used to deliver toxins into insect hosts. This putative antifeeding-like prophage might thus represent the missing protein secretion apparatus in A. asiaticus... - Recovery of an environmental Chlamydia strain from activated sludge by co-cultivation with Acanthamoeba spAstrid Collingro
Division of Microbial Ecology, Institute for Ecology and Conservation Biology, University of Vienna, Althanstr. 14, 1090 Vienna, Austria
Microbiology 151:301-9. 2005.... - Raman microspectroscopy reveals long-term extracellular activity of ChlamydiaeSusanne Haider
Department of Microbial Ecology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
Mol Microbiol 77:687-700. 2010..These findings change our perception of chlamydial biology and reveal that host-free analyses possess a previously not recognized potential for direct experimental access to these elusive microorganisms... - Identification and characterization of a novel porin family highlights a major difference in the outer membrane of chlamydial symbionts and pathogensKarin Aistleitner
Department of Microbial Ecology, University of Vienna, Vienna, Austria
PLoS ONE 8:e55010. 2013..amoebophila. This work contributes to our understanding of the adaptations of symbiotic and pathogenic chlamydiae to their different eukaryotic hosts... - Lack of effective anti-apoptotic activities restricts growth of Parachlamydiaceae in insect cellsBarbara S Sixt
Department of Microbial Ecology, University of Vienna, Vienna, Austria
PLoS ONE 7:e29565. 2012..These findings highlight the importance of the evolution of anti-apoptotic traits for the success of chlamydiae as pathogens of humans and animals... - A bacterial genome in transition--an exceptional enrichment of IS elements but lack of evidence for recent transposition in the symbiont Amoebophilus asiaticusStephan Schmitz-Esser
Department of Microbial Ecology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
BMC Evol Biol 11:270. 2011..The 1.88 Mbp genome of the obligate intracellular amoeba symbiont Amoebophilus asiaticus contains an unusually large number of transposase genes (n = 354; 23% of all genes)... - Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusionDoris Steger
Department of Microbial Ecology, Vienna Ecology Center, Faculty of Life Sciences, University of Vienna, Wien, Austria
PLoS ONE 6:e23727. 2011..In particular, non-random spatial variations within individual microarray hybridizations are often observed, but the mechanisms underpinning this positional bias remain incompletely explained... - Proteomic analysis of the outer membrane of Protochlamydia amoebophila elementary bodiesEva Heinz
Department of Microbial Ecology, Faculty of Life Sciences, University of Vienna, Austria
Proteomics 10:4363-76. 2010..They reveal both fundamental differences and convergent evolution between pathogenic and symbiotic chlamydiae... - Paracatenula, an ancient symbiosis between thiotrophic Alphaproteobacteria and catenulid flatwormsHarald Ronald Gruber-Vodicka
Department of Marine Biology, University of Vienna, A 1090 Vienna, Austria
Proc Natl Acad Sci U S A 108:12078-83. 2011.... - Inclusion membrane proteins of Protochlamydia amoebophila UWE25 reveal a conserved mechanism for host cell interaction among the ChlamydiaeEva Heinz
University of Vienna, Department of Microbial Ecology, Althanstrasse 14, A 1090 Vienna, Austria
J Bacteriol 192:5093-102. 2010..amoebophila shows that this strategy for host cell interaction is conserved among the chlamydiae and is used by chlamydial symbionts and pathogens alike... - The Planctomycetes, Verrucomicrobia, Chlamydiae and sister phyla comprise a superphylum with biotechnological and medical relevanceMichael Wagner
Department of Microbial Ecology, University of Vienna, Austria
Curr Opin Biotechnol 17:241-9. 2006..Furthermore, the availability of these genome sequences offered new insights into the evolutionary history of this peculiar group of microbes with major medical, ecological and biotechnological relevance... - Fluorescence in situ hybridisation for the identification and characterisation of prokaryotesMichael Wagner
Department of Microbial Ecology, Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14, A 1090 Vienna, Austria
Curr Opin Microbiol 6:302-9. 2003.... - A novel betaproteobacterial agent of gill epitheliocystis in seawater farmed Atlantic salmon (Salmo salar)Elena R Toenshoff
Department of Microbial Ecology, University of Vienna, Vienna, Austria
PLoS ONE 7:e32696. 2012..In conclusion, this study identified a novel agent of epitheliocystis in sea-farmed Atlantic salmon and demonstrated that these cysts can be caused by bacteria phylogenetically distinct from the Chlamydiae... - probeCheck--a central resource for evaluating oligonucleotide probe coverage and specificityAlexander Loy
Department of Microbial Ecology, Universitat Wien, Althanstrasse 14, A 1090 Wien, Austria
Environ Microbiol 10:2894-8. 2008..Taken together, these features provide a multifunctional platform with maximal flexibility for the user in the choice of databases and options for the evaluation of published and newly developed probes and primers... - Comparative genomics suggests an independent origin of cytoplasmic incompatibility in Cardinium hertigiiThomas Penz
Department of Microbial Ecology, University of Vienna, Vienna, Austria
PLoS Genet 8:e1003012. 2012..Instead, comparative genomics suggests an independent evolution of CI in Cardinium and Wolbachia and provides a novel context for understanding the mechanistic basis of CI... - probeBase--an online resource for rRNA-targeted oligonucleotide probes: new features 2007Alexander Loy
Department für Mikrobielle Okologie, Universitat Wien, Althanstrasse 14, A 1090 Wien, Austria
Nucleic Acids Res 35:D800-4. 2007..probeBase is freely accessible at http://www.microbial-ecology.net/probebase. Email correspondence can be addressed to probebase@microbial-ecology.net... - Co-evolution and symbiont replacement shaped the symbiosis between adelgids (Hemiptera: Adelgidae) and their bacterial symbiontsElena R Toenshoff
Department of Microbial Ecology, University of Vienna, Althanstrasse 14, Vienna, Austria
Environ Microbiol 14:1284-95. 2012.... - The isotope array, a new tool that employs substrate-mediated labeling of rRNA for determination of microbial community structure and functionJustyna Adamczyk
, , D-85350 Freising, Germany
Appl Environ Microbiol 69:6875-87. 2003.... - Tapping the nucleotide pool of the host: novel nucleotide carrier proteins of Protochlamydia amoebophilaIlka Haferkamp
Pflanzenphysiologie, , , D-67653 Kaiserslautern, Germany
Mol Microbiol 60:1534-45. 2006..amoebophila in this and previous studies uncovered that these metabolically impaired bacteria are intimately connected with their host cell's metabolism in a surprisingly complex manner... - Deciphering the evolution and metabolism of an anammox bacterium from a community genomeMarc Strous
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
Nature 440:790-4. 2006..Most significantly, we identified candidate genes responsible for ladderane biosynthesis and biological hydrazine metabolism, and discovered unexpected metabolic versatility... - Detection and differentiation of chlamydiae by fluorescence in situ hybridizationSven Poppert
, , Ulm, Germany
Appl Environ Microbiol 68:4081-9. 2002..In contrast to previously established detection methods for chlamydiae, FISH was not susceptible to false-positive results and allows the detection of all recognized chlamydiae in one single step... - Obligate bacterial endosymbionts of Acanthamoeba spp. related to the beta-Proteobacteria: proposal of 'Candidatus Procabacter acanthamoebae' gen. nov., sp. novMatthias Horn
, , Freising, Germany
Int J Syst Evol Microbiol 52:599-605. 2002.... - Molecular evidence for a uniform microbial community in sponges from different oceansUte Hentschel
Institut für Molekulare Infektionsbiologie, Universitat Wurzburg, D 97070 Wurzburg, Germany
Appl Environ Microbiol 68:4431-40. 2002..A picture emerges where sponges can be viewed as highly concentrated reservoirs of so far uncultured and elusive marine microorganisms... - The genus Caedibacter comprises endosymbionts of Paramecium spp. related to the Rickettsiales (Alphaproteobacteria) and to Francisella tularensis (Gammaproteobacteria)Cora L Beier
, , D-85350 Freising, Germany
Appl Environ Microbiol 68:6043-50. 2002..caryophilus lived within acanthamoebae prior to the infection of paramecia... - probeBase: an online resource for rRNA-targeted oligonucleotide probesAlexander Loy
, , Am Hochanger 4, D-85350 Freising, Germany
Nucleic Acids Res 31:514-6. 2003..Furthermore, the 'search target site' option provides guidance for the development of new FISH probes... - Enlightening energy parasitism by analysis of an ATP/ADP transporter from chlamydiaeOliver Trentmann
Pflanzenphysiologie, Technische Universitat Kaiserslautern, Kaiserslautern, Germany
PLoS Biol 5:e231. 2007..Furthermore, functional reconstitution of this essential chlamydial protein paves the way for high-throughput uptake studies in order to screen for specific inhibitors potentially suitable as anti-chlamydial drugs... - Amoebae as training grounds for intracellular bacterial pathogensMaelle Molmeret
Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, USA
Appl Environ Microbiol 71:20-8. 2005 - Discovery of the novel candidate phylum "Poribacteria" in marine spongesLars Fieseler
, , D-97070 Wuerzburg, Germany
Appl Environ Microbiol 70:3724-32. 2004..In addition to a report for Planctomycetes, this is the second report of cell compartmentalization, a feature that was considered exclusive to the eukaryotic domain, in prokaryotes... - A candidate NAD+ transporter in an intracellular bacterial symbiont related to ChlamydiaeIlka Haferkamp
Pflanzenphysiologie, Universitat Kaiserslautern, D 67653 Kaiserslautern, Germany
Nature 432:622-5. 2004..This protein acts together with a newly discovered nucleotide transporter and an ATP/ADP translocase, and allows UWE25 to exploit its host cell by means of a sophisticated metabolic parasitism... - Novel chlamydiae in whiteflies and scale insects: endosymbionts 'Candidatus Fritschea bemisiae' strain Falk and 'Candidatus Fritschea eriococci' strain ElmKarin D E Everett
Department of Biology, University of Washington, Seattle, WA 98195 5325, USA
Int J Syst Evol Microbiol 55:1581-7. 2005..We concluded that it was appropriate to propose 'Candidatus Fritschea bemisiae' strain Falk and 'Candidatus Fritschea eriococci' strain Elm as members of the family Simkaniaceae in the Chlamydiales... - Various bacterial pathogens and symbionts infect the amoeba Dictyostelium discoideumCarina Skriwan
, , Germany
Int J Med Microbiol 291:615-24. 2002..The observed subcellular locations which correspond to the locations within the respective natural hosts suggest that D. discoideum is a representative model system for these pathogens and symbionts... - Molecular analysis of bacteria in periodontitis: evaluation of clone libraries, novel phylotypes and putative pathogensGerhard Hutter
Institute for Hygiene, , Germany
Microbiology 149:67-75. 2003....