Browsing by Author "Valvano, Miguel A."

Now showing items 1-6 of 6

    • Different sugar residues of the lipopolysaccharide outer core are required for early interactions of ... 
      Bravo, Denisse; Hoare, Anilei; Silipo, Alba; Valenzuela, Camila; Salinas, Catalina; Álvarez Armijo, Sergio Aníbal; Molinaro, Antonio; Valvano, Miguel A.; Contreras, Inés (Elsevier, 2011)
      The role of lipopolysaccharide (LPS) in entry of Salmonella Typhimurium into epithelial cells remains unclear. In this study, we tested the ability of a series of mutants with deletions in genes for the synthesis and ...
    • Growth-phase regulation of lipopolysaccharide O-antigen chain length influences serum resistance in serovars ... 
      Bravo Rodríguez, Denisse; Silva Valenzuela, Cecilia Alejandra; Carter Jaña, Javier Antonio; Hoare Teuche, Anilei Paz; Álvarez Armijo, Sergio Aníbal; Blondel, Carlos; Zaldívar San Román, María Mercedes; Valvano, Miguel A.; Contreras, Inés (SOC GENERAL MICROBIOLOGYJournal Of Medical Microbiology, vol. 57 Issue 8 p. 938-946 AUG 2008, 2008-08)
      The amount of lipopolysaccharide (LPS) O antigen (OAg) and its chain length distribution are important factors that protect bacteria from serum complement. Salmonella enterica serovar Typhi produces LPS with long chain ...
    • O-antigen expression in Salmonella enterica serovar Typhi is regulated by nitrogen availability through ... 
      Bittner, Mauricio; Saldías, Soledad; Estévez, C.; Zaldívar San Román, María Mercedes; Marolda, Cristina; Valvano, Miguel A.; Contreras, Inés (SOC GENERAL MICROBIOLOGY, 2002-12)
      The authors previously reported increased expression of the Salmonella enterica serovar Typhi (S. typhi) rfaH gene when the bacterial cells reach stationary phase. In this study, using a lacZ fusion to the rfaH promoter ...
    • O-antigen modal chain length in Shigella flexneri 2a is growth-regulated through RfaH-mediated transcriptional ... 
      Carter Jaña, Javier Antonio; Blondel, Carlos; Zaldívar San Román, María Mercedes; Álvarez Armijo, Sergio Aníbal; Marolda, Cristina L.; Valvano, Miguel A.; Contreras, Inés (SOC GENERAL MICROBIOLOGY, 2007-10)
      Shigella flexneri 2a 2457T produces lipopolysaccharide (LIPS) with two O-antigen (OAg) chain lengths: a short (S-OAg) controlled by WzzB and a very long (VL-OAg) determined by Wzz(pHS-2). This study demonstrates that the ...
    • The outer core lipopolysaccharide of Salmonella enterica Serovar typhi is required for bacterial entry into ... 
      Hoare, Anilei; Bittner, Mauricio; Carter, Javier; Álvarez Armijo, Sergio Aníbal; Zaldívar San Román, María Mercedes; Bravo, Denisse; Valvano, Miguel A.; Contreras, Inés (AMER SOC MICROBIOLOGY, 2006-03)
      Salmonella enterica serovar Typhi causes typhoid fever in humans. Central to the pathogenicity of serovar Typhi is its capacity to invade intestinal epithelial cells. The role of lipopolysaccharide (LPS) in the invasion ...
    • RpoS and RpoN are involved in the growth-dependent regulation of rfaH transcription and O antigen expression ... 
      Bittner, Mauricio; Saldías, Soledad; Altamirano, Francisco; Valvano, Miguel A.; Contreras, Inés (ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2004-01)
      We reported earlier that the production of 0 antigen lipopolysaccharide (LPS) by Salmonella enterica serovar Typhi (Salmonella typhi) increases at the onset of stationary phase and correlates with a growth-regulated ...