Nonclassical, distinct endocytic signals dictate constitutive and PKC-regulated neurotransmitter transporter internalization.
Nat Neurosci
; 8(7): 881-8, 2005 Jul.
Article
em En
| MEDLINE
| ID: mdl-15924135
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.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas de Membrana Transportadoras
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Proteína Quinase C
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Glicoproteínas de Membrana
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Transdução de Sinais
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Endocitose
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Proteínas do Tecido Nervoso
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article