نتایج جستجو برای: oprd porin protein

تعداد نتایج: 1235787  

Journal: :The Journal of biological chemistry 1991
H Nikaido K Nikaido S Harayama

Earlier studies have shown that the major porin species in Pseudomonas aeruginosa outer membrane is protein F (OprF), which produces channels wider than those produced by Escherichia coli porins. In contrast, Yoshihara and Nakae ((1989) J. Biol. Chem. 264, 6297-6301) reported that protein F has no pore-forming activity as measured by the flux of L-arabinose, and that the channels in P. aerugino...

2015
Felipe Lira de Sá Cavalcanti Cristina Rodríguez Mirones Elena Román Paucar Laura Álvarez Montes Tereza Cristina Leal-Balbino Marcia Maria Camargo de Morais Luis Martínez-Martínez Alain Antonio Ocampo-Sosa

An investigation was carried out into the genetic mechanisms responsible for multidrug resistance in nine carbapenem-resistant Pseudomonas aeruginosa isolates from different hospitals in Recife, Brazil. Susceptibility to antimicrobial agents was determined by broth microdilution. Polymerase chain reaction (PCR) was employed to detect the presence of genes encoding β-lactamases, aminoglycoside-m...

Journal: :Journal of bacteriology 1984
M S Hindahl G W Crockford R E Hancock

The purified NmpC outer membrane protein from Escherichia coli, when incorporated into planar lipid bilayers, gave rise to channels with a single-channel conductance of 1.8 nS in 1 M KCl. This suggests that the NmpC protein is a porin.

Journal: :Infection and immunity 2008
Lotisha E Garvin Margaret C Bash Christine Keys Douglas M Warner Sanjay Ram William M Shafer Ann E Jerse

Typing of the porB variable region (VR) is an epidemiological tool that classifies gonococcal strains based on sequence differences in regions of the porB gene that encode surface-exposed loops. The frequent isolation of certain porB VR types suggests that some porin sequences confer a selective advantage during infection and/or transmission. Alternatively, certain porin types may be markers of...

Journal: :Antimicrobial agents and chemotherapy 2011
Laura García-Sureda Antonio Doménech-Sánchez Mariette Barbier Carlos Juan Joan Gascó Sebastián Albertí

Clinical isolates of Klebsiella pneumoniae resistant to carbapenems are being isolated with increasing frequency. Loss of the expression of the major nonspecific porins OmpK35/36 is a frequent feature in these isolates. In this study, we looked for porins that could compensate for the loss of the major porins in carbapenem-resistant organisms. Comparison of the outer membrane proteins from two ...

Journal: :Journal of bacteriology 2006
Maria Castillo-Keller Phu Vuong Rajeev Misra

A novel mechanism of Escherichia coli porin regulation was discovered from multicopy suppressors that permitted growth of cells expressing a mutant OmpC protein in the absence of DegP. Analyses of two suppressors showed that both substantially lowered OmpC expression. Suppression activities were confined to a short DNA sequence, which we designated ipeX for inhibition of porin expression, and t...

Journal: :Journal of bacteriology 1995
P Doig M M Exner R E Hancock T J Trust

Helicobacter pylori is a causative agent of gastritis in humans and is correlated with gastric ulcer formation. Infections with this bacterium have proven difficult to treat with antimicrobial agents. To better understand how this bacterium transports compounds such as antimicrobial agents across its outer membrane, identification of porin proteins is important. We have recently identified a fa...

Journal: :The Journal of Experimental Medicine 1998
Jos P.M. van Putten Thomas D. Duensing John Carlson

The neisserial porin P.I is a GTP binding protein that forms a voltage-gated channel that translocates into mammalian cell membranes and modulates host cell signaling events. Here, we report that P.I confers invasion of the bacterial pathogen Neisseria gonorrhoeae into Chang epithelial cells and that this event is controlled by GTP, as well as other phosphorus-containing compounds. Bacterial in...

2005
Monica LINDEN

Purified mitochondria from rat brain contain microtubule-associated proteins (MAPs) bound to the outer membrane. Studies of binding in vitro performed with microtubules and with purified microtubule proteins showed that mitochondria preferentially interact with the high-molecular-mass MAPs (and not with Tau protein). Incubation of intact mitochondria with Taxol-stabilized microtubules resulted ...

2006
Edward Hebert Lotisha Erin Garvin

Title of Thesis: Investigation of the Basis for Persistent Porin Serotypes of Neisseria gonorrhoeae in Community Infections Lotisha Erin Garvin, Master Degree, 2006 Thesis directed by: Ann Jerse, Ph. D. Associate Professor, Department of Microbiology and Immunology Uniformed Services University Neisseria gonorrhoeae porin (por), a major outer membrane protein, has been studied extensively in va...

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