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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
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Regulating the conducting states of a mammalian serotonin transporter.

Serotonin transporters (SERTs), sites of psychostimulant action, display multiple conducting states in expression systems. These include a substrate-independent transient conductance, two separate substrate-independent leak conductances associated with Na(+) and H(+), and a substrate-dependent conductance of variable stoichiometry, which exceeds that predicted from electroneutral substrate transport. The present data show that the SNARE protein syntaxin 1A binds the N-terminal tail of SERT, and this interaction regulates two SERT-conducting states. First, substrate-induced currents are absent because Na(+) flux becomes strictly coupled to 5HT transport. Second, Na(+)-mediated leak currents are eliminated. These two SERT-conducting states are present endogenously in thalamocortical neurons, act to depolarize the membrane potential, and are modulated by molecules that disrupt SERT and syntaxin 1A interactions. These data show that protein interactions govern SERT activity and suggest that both cell excitability and psychostimulant-mediated effects will be dependent upon the state of association among SERT and its interacting partners.[1]

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