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- W2000277151 abstract "J. Neurochem. (2010) 113 , 1113–1122. Abstract We have identified two genes from the parasitic nematode Haemonchus contortus , Hco‐unc‐49B and Hco‐unc‐49C that encode two GABA‐gated chloride channel subunits. Electrophysiological analysis revealed that this channel has properties similar to those of the UNC‐49 channel from the free‐living nematode Caenorhabditis elegans . For example, the Hco‐UNC‐49B subunit forms a functional homomeric channel that responds to GABA and is highly sensitive to picrotoxin. Hco‐UNC‐49C alone does not respond to GABA but can assemble with Hco‐UNC‐49B to form a heteromeric channel with a lower sensitivity to picrotoxin. However, we did find that the Hco‐UNC‐49B/C heteromeric channel is significantly more responsive to agonists compared to the Hco‐UNC‐49B homomeric channel, which is the opposite trend to what has been found previously for the C. elegans channel. To investigate the subunit requirements for high agonist sensitivity, we generated cross‐assembled channels by co‐expressing the H. contortus subunits with UNC‐49 subunits from C. elegans (Cel‐UNC‐49). Co‐expressing Cel‐UNC‐49B with Hco‐UNC‐49C produced a heteromeric channel with a reduced sensitivity to GABA compared to that of the Cel‐UNC‐49B homomeric channel. In contrast, co‐expressing Hco‐UNC‐49B with Cel‐UNC‐49C produced a heteromeric channel that, like the Hco‐UNC‐49B/C heteromeric channel, exhibits an increased sensitivity to GABA. These results suggest that the Hco‐UNC‐49B subunit is the key determinant for the high agonist sensitivity of heteromeric channels." @default.
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- W2000277151 date "2010-05-04" @default.
- W2000277151 modified "2023-10-16" @default.
- W2000277151 title "An UNC-49 GABA receptor subunit from the parasitic nematode<i>Haemonchus contortus</i>is associated with enhanced GABA sensitivity in nematode heteromeric channels" @default.
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- W2000277151 doi "https://doi.org/10.1111/j.1471-4159.2010.06651.x" @default.
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