Introducing tetraCys motifs at two different sites results in a functional dopamine transporter

Orun, Oya and Rasmussen, S. and Gether, U. (2009) Introducing tetraCys motifs at two different sites results in a functional dopamine transporter. Acta Biologica Hungarica, 60 (1). pp. 15-25. ISSN 0236-5383

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Abstract

We have introduced tetracysteine motifs into different positions of the dopamine transporter (DAT) for specific FlAsH labeling. Two of the constructs expressed at the cell surface and were functional as deter- mined by [ 3 H] dopamine uptake experiments. The N-terminally modified transporter showed uptake lev- els comparable to the wild-type DAT, while the construct with tetracysteine motif at position 511 dis- played an uptake level about 1/3 of its wild-type counterpart. In addition, these two transporter constructs were visualized on the cell surface following labeling with a fluorescent cocaine analog. YFP introduced into the same N-terminal position was also shown to have surface staining in agreement with activity tests. We propose that these two sites are suitable targets for tetracysteine labeling to be used in FlAsH staining studies, while p134, p342, p427, p433 and p517 sites are not.

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