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• W2129774838 startingPage "2530" @default.
• W2129774838 abstract "Big brain ( bib ) is a neurogenic gene that when mutated causes defects in cell fate determination during Drosophila neurogenesis through an unknown mechanism. The protein Big Brain (BIB) has sequence identity with the major intrinsic protein family that includes the water- and ion-conducting aquaporin channels. We show here that BIB expressed heterologously in Xenopus oocytes provides a voltage-insensitive, nonselective cation channel function with permeability to K + > Na + ≫ tetraethylammonium. The conductance, activated in response to endogenous signaling pathways in BIB-expressing oocytes, is decreased after treatment with 20 μ m insulin and is enhanced with 10 μ m lavendustin A, a tyrosine kinase inhibitor. Western blot analysis confirms that BIB is tyrosine-phosphorylated. Both tyrosine phosphorylation and the potentiating effect of lavendustin A are removed by partial deletion of the C terminus (amino acids 317–700). Current activation is not observed in control oocytes or in oocytes expressing a nonfunctional mutant (BIB E71N) that appears to be expressed on the plasma membrane by confocal microscopy and Western blotting. These results indicate that BIB can participate in tyrosine kinase-regulated transmembrane signaling and may suggest a role for membrane depolarization in the neurogenic function of BIB in early development." @default.
• W2129774838 created "2016-06-24" @default.
• W2129774838 creator A5009729389 @default.
• W2129774838 creator A5058099278 @default.
• W2129774838 date "2002-04-01" @default.
• W2129774838 modified "2023-09-28" @default.
• W2129774838 title "Regulated Cationic Channel Function in<i>Xenopus</i>Oocytes Expressing<i>Drosophila</i>Big Brain" @default.
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• W2129774838 doi "https://doi.org/10.1523/jneurosci.22-07-02530.2002" @default.
• W2129774838 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6758330" @default.
• W2129774838 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11923418" @default.
• W2129774838 hasPublicationYear "2002" @default.
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