Experts and Doctors on escherichia coli in San Miguel de Tucumán, Tucumán, Argentina


Locale: San Miguel de Tucumán, Tucumán, Argentina
Topic: escherichia coli

Top Publications

  1. Rodríguez Montelongo L, Farias R, Massa E. Sites of electron transfer to membrane-bound copper and hydroperoxide-induced damage in the respiratory chain of Escherichia coli. Arch Biochem Biophys. 1995;323:19-26 pubmed
    ..It is proposed that the t-BOOH-induced damage is a consequence of t-butylalkoxy radical generation through a Fenton-type reaction mediated by redox cycling of membrane-bound copper at those two loci of the respiratory chain. ..
  2. Delgado M, Vincent P, Farias R, Salomon R. YojI of Escherichia coli functions as a microcin J25 efflux pump. J Bacteriol. 2005;187:3465-70 pubmed
    ..The outer membrane protein TolC in addition to YojI is required for export of microcin J25 out of the cell. Microcin J25 is thus the first known substrate for YojI...
  3. de Cristóbal R, Solbiati J, Zenoff A, Vincent P, Salomon R, Yuzenkova J, et al. Microcin J25 uptake: His5 of the MccJ25 lariat ring is involved in interaction with the inner membrane MccJ25 transporter protein SbmA. J Bacteriol. 2006;188:3324-8 pubmed
    ..Our results thus suggest that MccJ25 His5 located in the lariat ring is involved, directly or indirectly, in specific interaction with SbmA and is not required for MccJ25 inhibition of RNAP. ..
  4. Schurig Briccio L, Rintoul M, Volentini S, Farias R, Baldoma L, Badia J, et al. A critical phosphate concentration in the stationary phase maintains ndh gene expression and aerobic respiratory chain activity in Escherichia coli. FEMS Microbiol Lett. 2008;284:76-83 pubmed publisher
    ..These physiological parameters gradually changed, but NDH-2 activity remained high for up to 94 h. Phosphate seems to trigger an internal signal in the stationary phase mediated by systems not yet described. ..
  5. Schurig Briccio L, Farias R, Rintoul M, Rapisarda V. Phosphate-enhanced stationary-phase fitness of Escherichia coli is related to inorganic polyphosphate level. J Bacteriol. 2009;191:4478-81 pubmed publisher
  6. Chalon M, Bellomio A, Solbiati J, Morero R, Farias R, Vincent P. Tyrosine 9 is the key amino acid in microcin J25 superoxide overproduction. FEMS Microbiol Lett. 2009;300:90-6 pubmed publisher
    ..Only the Y9F mutant lost the ability to overproduce superoxide and inhibit oxygen consumption. The last results confirm that the Tyr(9), and not Tyr(20), is involved in the MccJ25 action on the respiratory chain target. ..
  7. Socias S, Severinov K, Salomon R. The Ile13 residue of microcin J25 is essential for recognition by the receptor FhuA, but not by the inner membrane transporter SbmA. FEMS Microbiol Lett. 2009;301:124-9 pubmed publisher
    ..From these results, we propose that the Ile(13) residue is only required for interaction with FhuA, and that VGIG is not a major recognition element by SbmA. ..
  8. Grillo Puertas M, Villegas J, Rintoul M, Rapisarda V. Polyphosphate degradation in stationary phase triggers biofilm formation via LuxS quorum sensing system in Escherichia coli. PLoS ONE. 2012;7:e50368 pubmed publisher
    ..According to our results, phosphate concentration of the culture media should be carefully considered in bacterial adhesion and virulence studies...
  9. Delgado M, Solbiati J, Chiuchiolo M, Farias R, Salomon R. Escherichia coli outer membrane protein TolC is involved in production of the peptide antibiotic microcin J25. J Bacteriol. 1999;181:1968-70 pubmed
    ..The tolC mutants carrying multiple copies of the microcin genes were less immune to the microcin. TolC is thus likely a component of a microcin export complex containing the McjD immunity protein, an ABC exporter...

More Information


  1. Rapisarda V, Volentini S, Farias R, Massa E. Quenching of bathocuproine disulfonate fluorescence by Cu(I) as a basis for copper quantification. Anal Biochem. 2002;307:105-9 pubmed
    ..Data show that the fluorometric assays described in this paper are simple and convenient procedures for total copper and direct Cu(I) quantification in determined biological samples. ..
  2. Rodríguez Montelongo L, Volentini S, Farias R, Massa E, Rapisarda V. The Cu(II)-reductase NADH dehydrogenase-2 of Escherichia coli improves the bacterial growth in extreme copper concentrations and increases the resistance to the damage caused by copper and hydroperoxide. Arch Biochem Biophys. 2006;451:1-7 pubmed
    ..These results suggest that NDH-2 contributes in the bacterial oxidative protection and in the copper homeostasis. ..
  3. de Cristóbal R, Vincent P, Salomon R. A combination of sbmA and tolC mutations in Escherichia coli K-12 Tn10-carrying strains results in hypersusceptibility to tetracycline. J Bacteriol. 2008;190:1491-4 pubmed
    ..There thus appears to be an additive effect of the mutations, resulting in almost complete suppression of the phenotypic expression of Tn10 tetracycline resistance. ..