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Hamilton, Peter J; Belovich, Andrea N; Khelashvili, George; Saunders, Christine; Erreger, Kevin; Javitch, Jonathan A; Sitte, Harald H; Weinstein, Harel; Matthies, Heinrich J G; Galli, Aurelio
Nature chemical biology, 07/2014, Letnik: 10, Številka: 7Journal Article
Phosphatidylinositol (4,5)-bisphosphate (PIP2) regulates the function of ion channels and transporters. Here, we demonstrate that PIP2 directly binds the human dopamine (DA) transporter (hDAT), a key regulator of DA homeostasis and a target of the psychostimulant amphetamine (AMPH). This binding occurs through electrostatic interactions with positively charged hDAT N-terminal residues and is shown to facilitate AMPH-induced, DAT-mediated DA efflux and the psychomotor properties of AMPH. Substitution of these residues with uncharged amino acids reduces hDAT-PIP2 interactions and AMPH-induced DA efflux without altering the hDAT physiological function of DA uptake. We evaluated the significance of this interaction in vivo using locomotion as a behavioral assay in Drosophila melanogaster. Expression of mutated hDAT with reduced PIP2 interaction in Drosophila DA neurons impairs AMPH-induced locomotion without altering basal locomotion. We present what is to our knowledge the first demonstration of how PIP2 interactions with a membrane protein can regulate the behaviors of complex organisms.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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