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Taxonomic study of Xenorhabdus, a genus of bacteria symbionts of Steinernema scapterisci. J. Invertebr. Pathol. 62: 68–72. symbiotically associated with insect pathogenic nematodes. Int. J. Syst. Agustin, E.T. and B.A. Cunha. 1995. Buttock abscess due to Hafnia alvei. Bacteriol. 33: 38–45. Clin. Infect. Dis. 20: 1426. Akhurst, R.J. 1986a. Xenorhabdus nematophilus subsp. beddingii, new sub- Ahlquist, G.A., C.A. Fewson, D.A. Ritchie, J. Podmore and V. Rowell. 1980. species (Enterobacteriaceae): A new subspecies of bacteria mutualistically Competence for genetic transformation of Acinetobacter calcoaceticus associated with entomopathogenic nematodes. Int. J. Syst. Bacteriol. NCIB 8250. FEMS Microbiol. Lett. 7: 107–109. 36: 454–457. Ahmad, A.A., J.P. Barry and D.C. Nelson. 1999. Phylogenetic affinity of Akhurst, R.J. 1986b. Xenorhabdus nematophilus subsp. poinarii: its interac- tion with insect pathogenic nematodes. Syst. Appl. 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    Departamento de Microbiología y Ecología Colección Española de Cultivos Tipo Doctorado en Biotecnología Biodiversidad bacteriana marina: nuevos taxones cultivables Directores de Tesis David Ruiz Arahal Mª Jesús Pujalte Domarco Mª Carmen Macián Rovira Teresa Lucena Reyes Tesis Doctoral Valencia, 2012 Dr. David Ruiz Arahal , Profesor Titular del Departamento de Microbiología y Ecología de la Universidad de Valencia, Dra. María Jesús Pujalte Domarco , Catedrática del Departamento de Microbiología y Ecología de la Universidad de Valencia, y Dra. Mª Carmen Macián Rovira , Técnico Superior de Investigación de la Colección Española de Cultivos Tipo de la Universidad de Valencia, CERTIFICAN: Que Teresa Lucena Reyes, Licenciada en Ciencias Biológicas por la Universidad de Valencia, ha realizado bajo su dirección el trabajo titulado “Biodiversidad bacteriana marina: nuevos taxones cultivables”, que presenta para optar al grado de Doctor en Ciencias Biológicas por la Universidad de Valencia. Y para que conste, en el cumplimiento de la legislación vigente, firman el presente certificado en Valencia, a. David Ruiz Arahal Mª Jesús Pujalte Domarco Mª Carmen Macián Rovira Relación de publicaciones derivadas de la presente Tesis Doctoral Lucena T , Pascual J, Garay E, Arahal DR, Macián MC, Pujalte MJ (2010) . Haliea mediterranea sp. nov., a marine gammaproteobacterium. Int J Syst Evol Microbiol 60 , 1844-8. Lucena T, Pascual J, Giordano A, Gambacorta A, Garay E, Arahal DR, Macián MC, Pujalte MJ (2010) . Euzebyella saccharophila gen. nov., sp. nov., a marine bacterium of the family Flavobacteriaceae . Int J Syst Evol Microbiol 60 , 2871-6. Lucena T, Ruvira MA, Pascual J, Garay E, Macián MC, Arahal DR, Pujalte MJ (2011) . Photobacterium aphoticum sp.
  • The Flagellar Regulon of Legionella—A Review

    The Flagellar Regulon of Legionella—A Review

    REVIEW published: 20 October 2017 doi: 10.3389/fcimb.2017.00454 The Flagellar Regulon of Legionella—A Review Sandra Appelt 1 and Klaus Heuner 2* 1 Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens, Robert Koch Institute, Berlin, Germany, 2 Cellular Interactions of Bacterial Pathogens, Centre for Biological Threats and Special Pathogens, Robert Koch Institute, Berlin, Germany The Legionella genus comprises more than 60 species. In particular, Legionella pneumophila is known to cause severe illnesses in humans. Legionellaceae are ubiquitous inhabitants of aquatic environments. Some Legionellaceae are motile and their motility is important to move around in habitats. Motility can be considered as a potential virulence factor as already shown for various human pathogens. The genes of the flagellar system, regulator and structural genes, are structured in hierarchical levels described as the flagellar regulon. Their expression is modulated by various environmental factors. For L. pneumophila it was shown that the expression of genes of the flagellar regulon is modulated by the actual growth phase and temperature. Especially, flagellated Legionella are known to express genes during the transmissive phase of growth that are involved in the expression of virulence traits. It has been demonstrated that the alternative sigma-28 factor is part of the link between virulence expression and motility. In the following review, the structure of the flagellar regulon of L. pneumophila is discussed and compared to other flagellar systems of different Legionella species. Recently, it has been described that Legionella micdadei and Legionella fallonii contain a second putative partial flagellar Edited by: system. Hence, the report will focus on flagellated and non-flagellated Legionella strains, Matthias P.