Uptake of extracellular double-stranded RNA by SID-2.
Uptake of extracellular double-stranded RNA by SID-2.
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DOI:
10.1016/j.molcel.2012.07.014
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发表时间:
2012-09-14
期刊:
影响因子:
16
通讯作者:
Huntert, Craig P.
中科院分区:
文献类型:
--
作者:
McEwan, Deborah L.;Weisman, Alexandra S.;Huntert, Craig P.
Ingested dsRNAs trigger RNA interference (RNAi) in many invertebrates including the nematode Caenorhabditis elegans. Here we show that the C. elegans apical intestinal membrane protein SID-2 is required in C. elegans for the import of ingested dsRNA and, when expressed in Drosophila S2 cells, SID-2 enables the uptake of dsRNAs. SID-2-dependent dsRNA transport requires an acidic extracellular environment and is selective for dsRNAs with at least 50 base pairs. Through structure-function analysis, we identify several SID-2 regions required for this activity including three extracellular, positively-charged, histidines. Finally, we find that SID-2-dependent transport is inhibited by drugs that interfere with vesicle transport. Therefore, we propose that environmental dsRNAs are imported from the acidic intestinal lumen by SID-2 via endocytosis and are released from internalized vesicles in a secondary step mediated by the dsRNA-channel SID-1. Similar multistep mechanisms may underlie the widespread observations of environmental RNAi.
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