An evolutionarily-unique heterodimeric voltage-gated cation channel found in aphids.

An evolutionarily-unique heterodimeric voltage-gated cation channel found in aphids.
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DOI:
10.1016/j.febslet.2015.01.020
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发表时间:
2015-02-27
期刊:
影响因子:
3.5
通讯作者:
Davies TG
Davies TG
中科院分区:
生物学3区
文献类型:
--
作者:
Amey JS;O'Reilly AO;Burton MJ;Puinean AM;Mellor IR;Duce IR;Field LM;Wallace BA;Williamson MS;Davies TG

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Aphids have a unique heterodimeric voltage-gated sodium channel. The aphid channel has an atypical ion-selectivity filter (DENS rather than DEKA). The channel’s novel selectivity filter may result in a loss of sodium selectivity. This is the only identifiable voltage-gated sodium channel in aphid genome(s). This channel has most likely arisen by gene fission or gene duplication. We describe the identification in aphids of a unique heterodimeric voltage-gated sodium channel which has an atypical ion selectivity filter and, unusually for insect channels, is highly insensitive to tetrodotoxin. We demonstrate that this channel has most likely arisen by adaptation (gene fission or duplication) of an invertebrate ancestral mono(hetero)meric channel. This is the only identifiable voltage-gated sodium channel homologue in the aphid genome(s), and the channel’s novel selectivity filter motif (DENS instead of the usual DEKA found in other eukaryotes) may result in a loss of sodium selectivity, as indicated experimentally in mutagenised Drosophila channels.
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