RRC ID 65008
著者 Kikuta S, Endo H, Tomita N, Takada T, Morita C, Asaoka K, Sato R.
タイトル Characterization of a ligand-gated cation channel based on an inositol receptor in the silkworm, Bombyx mori.
ジャーナル Insect Biochem Mol Biol
Abstract Insect herbivores recognize non-volatile compounds in plants to direct their feeding behavior. Gustatory receptors (Gr) appear to be required for nutrient recognition by gustatory organs in the mouthparts of insects. Gr10 is expressed in Bombyx mori (BmGr10) mouthparts such as maxillary galea, maxillary palp, and labrum. BmGr10 is predicted to function in sugar recognition; however, the precise biochemical function remains obscure. Larvae of B. mori are monophagous feeders able to find and feed on mulberry leaves. Soluble mulberry leaf extract contains sucrose, glucose, fructose, and myo-inositol. In this study, we identified BmGr10 as an inositol receptor using electrophysiological analysis with the Xenopus oocyte expression system and Ca(2+) imaging techniques using mammalian cells. These results demonstrated that Xenopus oocytes or HEK293T cells expressing BmGr10 specifically respond to myo-inositol and epi-inositol but do not respond to any mono-, di-, or tri-saccharides or to some sugar alcohols. These inositols caused Ca(2+) and Na(+) influxes into the cytoplasm independently of a G protein-mediated signaling cascade, indicating that BmGr10 is a ligand-gated cation channel. Overall, BmGr10 plays an important role in the myo-inositol recognition required for B. mori larval feeding behavior.
巻・号 74
ページ 12-20
公開日 2016-7-1
DOI 10.1016/j.ibmb.2016.04.010
PII S0965-1748(16)30054-6
PMID 27132146
MeSH Animals Bombyx / genetics* Bombyx / growth & development Bombyx / metabolism Feeding Behavior HEK293 Cells Humans Inositol / metabolism* Insect Proteins / genetics* Insect Proteins / metabolism Larva / genetics Larva / growth & development Larva / metabolism Ligands Phylogeny Receptors, Cell Surface / genetics* Receptors, Cell Surface / metabolism
IF 3.827
リソース情報
ヒト・動物細胞 293T(RCB2202)