Several families of peptide toxins from cone snails affect voltage-gated sodium (Na(V)) channels: mu-conotoxins block the pore, delta-conotoxins inhibit channel inactivation, and muO-conotoxins inhibit Na(V) channels by an unknown mechanism. The only currently known muO-conotoxins MrVIA and MrVIB from Conus marmoreus were applied to cloned rat skeletal muscle (Na(V)1.4) and brain (Na(V)1.2) sodium channels in mammalian cells. A systematic domain-swapping strategy identified the C-terminal pore loop of domain-3 as the major determinant for Na(V)1.4 being more potently blocked than Na(V)1.2 channels. muO-conotoxins therefore show an interaction pattern with Na(V) channels that is clearly different from the related mu- and delta-conotoxins, indicative of a distinct molecular mechanism of channel inhibition.
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Several families of peptide toxins from cone snails affect voltage-gated sodium (Na(V)) channels: mu-conotoxins block the pore, delta-conotoxins inhibit channel inactivation, and muO-conotoxins inhibit Na(V) channels by an unknown mechanism. The only currently known muO-conotoxins MrVIA and MrVIB from Conus marmoreus were applied to cloned rat skeletal muscle (Na(V)1.4) and brain (Na(V)1.2) sodium channels in mammalian cells. A systematic domain-swapping strategy identified the C-terminal pore loop of domain-3 as the major determinant for Na(V)1.4 being more potently blocked than Na(V)1.2 channels. muO-conotoxins therefore show an interaction pattern with Na(V) channels that is clearly different from the related mu- and delta-conotoxins, indicative of a distinct molecular mechanism of channel inhibition.
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| uniprot:name |
FEBS Lett.
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| uniprot:author |
Bulaj G.,
Hansel A.,
Heinemann S.H.,
Leipold E.,
Olivera B.M.,
Terlau H.,
Zorn S.
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| uniprot:date |
2006
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| uniprot:pages |
1360-1364
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| uniprot:title |
The muO-conotoxin MrVIA inhibits voltage-gated sodium channels by associating with domain-3.
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| uniprot:volume |
580
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| dc-term:identifier |
doi:10.1016/j.febslet.2006.01.057
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