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Baliova, Martina; Juhasova, Anna; Jursky, Frantisek
Biochemical and biophysical research communications, 11/2014, Volume: 454, Issue: 1Journal Article
A ubiquitous feature of neurotransmitter transporters is the presence of short C-terminal PDZ binding motifs acting as important trafficking elements. Depending on their very C-terminal sequences, PDZ binding motifs are usually divided into at least three groups; however this classification has recently been questioned. To introduce a 3D aspect into transporter's PDZ motif similarities, we compared their interactions with the natural collection of all 13 PDZ domains of the largest PDZ binding protein MUPP1. The GABA, glycine and serotonin transporters showed unique binding preferences scattered over one or several MUPP1 domains. On the contrary, the dopamine and norepinephrine transporter PDZ motifs did not show any significant affinity to MUPP1 domains. Interestingly, despite their terminal sequence diversity all three GABA transporter PDZ motifs interacted with MUPP1 domain 7. These results indicate that similarities in binding schemes of individual transporter groups might exist. Results also suggest the existence of variable PDZ binding modes, allowing several transporters to interact with identical PDZ domains and potentially share interaction partners in vivo.
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