alexa Zn(2+) site engineering at the oligomeric interface of the dopamine transporter.
Biochemistry

Biochemistry

Journal of Membrane Science & Technology

Author(s): NorgaardNielsen K, Norregaard L, Hastrup H, Javitch JA, Gether U

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Abstract Increasing evidence suggests that Na(+)/Cl(-)-dependent neurotransmitter transporters exist as homo-oligomeric proteins. However, the functional implication of this oligomerization remains unclear. Here we demonstrate the engineering of a Zn(2+) binding site at the predicted dimeric interface of the dopamine transporter (DAT) corresponding to the external end of transmembrane segment 6. Upon binding to this site, which involves a histidine inserted in position 310 (V310H) and the endogenous Cys306 within the same DAT molecule, Zn(2+) potently inhibits [(3)H]dopamine uptake. These data provide indirect evidence that conformational changes critical for the translocation process may occur at the interface between two transporter molecules in the oligomeric structure.
This article was published in FEBS Lett and referenced in Journal of Membrane Science & Technology

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