University of Massachusetts Medical School Faculty Publications

Title

Nonclassical, distinct endocytic signals dictate constitutive and PKC-regulated neurotransmitter transporter internalization

UMMS Affiliation

Brudnick Neuropsychiatric Research Institute, Department of Psychiatry; Melikian Lab

Publication Date

2005-7

Document Type

Article

Disciplines

Neuroscience and Neurobiology

Abstract

Neurotransmitter transporters are critical for synaptic neurotransmitter inactivation. Transporter inhibitors markedly increase the duration and magnitude of synaptic transmission, underscoring the importance of transporter activity in neurotransmission. Recent studies indicate that membrane trafficking dynamically governs neuronal transporter cell-surface presentation in a protein kinase C-regulated manner, suggesting that transporter trafficking profoundly affects synaptic signaling. However, the molecular architecture coupling neurotransmitter transporters to the endocytic machinery is not defined. Here, we identify nonclassical, distinct endocytic signals in the dopamine transporter (DAT) that are necessary and sufficient to drive constitutive and protein kinase C-regulated DAT internalization. The DAT internalization signal is conserved across SLC6 neurotransmitter carriers and is functional in the homologous norepinephrine transporter, suggesting that this region is likely to be the endocytic signal for all SLC6 neurotransmitter transporters. The DAT endocytic signal does not conform to classic internalization motifs, suggesting that SLC6 neurotransmitter transporters may have evolved unique endocytic mechanisms.

DOI of Published Version

10.1038/nn1478

Source

Nat Neurosci. 2005 Jul;8(7):881-8. doi: 10.1038/nn1478. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Nature neuroscience

PubMed ID

15924135

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