Electrophysiological Characterization of Non-NMDA Glutamate Receptors on Cultured Intermediate Lobe Cells of the Rat Pituitary

1996 ◽  
Vol 64 (2) ◽  
pp. 162-168 ◽  
Author(s):  
Pierrick Poisbeau ◽  
Young-Hwan Jo ◽  
Paul Feltz ◽  
Rémy Schlichter
Keyword(s):  
Glutamate Receptors ◽  
Intermediate Lobe ◽  
Rat Pituitary ◽  
Nmda Glutamate Receptors ◽  
Electrophysiological Characterization

Electrophysiological Characterization of Transport Across Outer Membrane Channels from Gram-Negative Bacteria in Their Native Environment

2019 ◽  
Author(s):  
Jiajun Wang ◽  
Rémi Terrasse ◽  
Jayesh Arun Bafna ◽  
Lorraine Benier ◽  
Mathias Winterhalter
Keyword(s):  
Outer Membrane ◽  
Lipid Membrane ◽  
Membrane Vesicles ◽  
Outer Membrane Vesicles ◽  
Multi Drug Resistance ◽  
Gram Negative Bacteria ◽  
Membrane Channels ◽  
Gram Negative ◽  
Electrophysiological Characterization

Multi-drug resistance in Gram-negative bacteria is often associated with low permeability of the outer membrane. To investigate the role of membrane channels in the uptake of antibiotics, we extract, purify and reconstitute them into artificial planar membranes. To avoid this time-consuming procedure, here we show a robust approach using fusion of native outer membrane vesicles (OMV) into planar lipid bilayer which moreover allows also to some extend the characterization of membrane protein channels in their native environment. Two major membrane channels from <i>Escherichia coli</i>, OmpF and OmpC, were overexpressed from the host and the corresponding OMVs were collected. Each OMV fusion revealed surprisingly single or only few channel activities. The asymmetry of the OMV´s translates after fusion into the lipid membrane with the LPS dominantly present at the side of OMV addition. Compared to conventional reconstitution methods, the channels fused from OMVs containing LPS have similar conductance but a much broader distribution. The addition of Enrofloxacin on the LPS side yields somewhat higher association (<i>k<sub>on</sub></i>) and lower dissociation (<i>k<sub>off</sub></i>) rates compared to LPS-free reconstitution. We conclude that using outer membrane vesicles is a fast and easy approach for functional and structural studies of membrane channels in the native membrane.

scholarly journals Electrophysiological characterization of a diverse group of sugar transporters from Trichoderma reesei

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sami Havukainen ◽  
Jonai Pujol-Giménez ◽  
Mari Valkonen ◽  
Ann Westerholm-Parvinen ◽  
Matthias A. Hediger ◽  
...  
Keyword(s):  
Trichoderma Reesei ◽  
Scientific Literature ◽  
Large Body ◽  
Comprehensive Analysis ◽  
Transport Function ◽  
Sugar Transporters ◽  
New Knowledge ◽  
Electrophysiological Characterization ◽  
Shed Light

AbstractTrichoderma reesei is an ascomycete fungus known for its capability to secrete high amounts of extracellular cellulose- and hemicellulose-degrading enzymes. These enzymes are utilized in the production of second-generation biofuels and T. reesei is a well-established host for their production. Although this species has gained considerable interest in the scientific literature, the sugar transportome of T. reesei remains poorly characterized. Better understanding of the proteins involved in the transport of different sugars could be utilized for engineering better enzyme production strains. In this study we aimed to shed light on this matter by characterizing multiple T. reesei transporters capable of transporting various types of sugars. We used phylogenetics to select transporters for expression in Xenopus laevis oocytes to screen for transport activities. Of the 18 tested transporters, 8 were found to be functional in oocytes. 10 transporters in total were investigated in oocytes and in yeast, and for 3 of them no transport function had been described in literature. This comprehensive analysis provides a large body of new knowledge about T. reesei sugar transporters, and further establishes X. laevis oocytes as a valuable tool for studying fungal sugar transporters.

scholarly journals Electrophysiological characterization of contact sites in brain mitochondria.

1990 ◽  
Vol 265 (2) ◽  
pp. 908-913
Author(s):  
O Moran ◽  
G Sandri ◽  
E Panfili ◽  
W Stühmer ◽  
M C Sorgato
Keyword(s):  
Brain Mitochondria ◽  
Contact Sites ◽  
Electrophysiological Characterization

scholarly journals Illuminating Ionotropic Glutamate Receptors: Characterization of Fluorescent Antagonists Based on Polyamine Toxins

2013 ◽  
Vol 104 (2) ◽  
pp. 272a
Author(s):  
Christel B. Jensen ◽  
Niels G. Nørager ◽  
Anders S. Kristensen ◽  
Kristian Strømgaard
Keyword(s):  
Glutamate Receptors ◽  
Ionotropic Glutamate Receptors ◽  
Polyamine Toxins

Cloning and characterization of alternative mRNA forms for the rat metabotropic glutamate receptors mGluR7 and mGluR8

1998 ◽  
Vol 10 (12) ◽  
pp. 3629-3641 ◽  
Author(s):  
Corrado Corti ◽  
Sophie Restituito ◽  
Joseph M. Rimland ◽  
Isabelle Brabet ◽  
Mauro Corsi ◽  
...  
Keyword(s):  
Glutamate Receptors ◽  
Metabotropic Glutamate Receptors ◽  
Metabotropic Glutamate
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