Truncation of human dopamine transporter by protease calpain.

Abstract:

:It has been shown recently that the N-terminal domain of the dopamine transporter (DAT) plays a role in several transporter functions. Here we provide evidence for a possible cellular mechanism of how the N-terminus of dopamine transporter might be removed in vivo. We isolated a recombinant N-terminal protein region of human dopamine transporter and cleaved it with calpain protease. Peptide fragment analysis revealed the existence of two calpain cleavage sites at positions Thr43/Ser44 and Leu71/Ser72 of the DATN-terminus. We show that calpain activation in rat striatal synaptosomes leads to a rapid decrease of dopamine transporter N-terminal epitopes corresponding to the protein sequences removed by a calpain cleavage at Thr43/Ser44 and that the process is totally blocked by a calpain inhibitor. Calpain truncation of the DATN-terminus abolishes its interaction with the receptor of activated protein kinase C, RACK1 and removes protein sequences previously implicated in amphetamine-induced dopamine release, PKC-dependent endocytosis and the interaction of DAT with the dopamine D2 receptor. The above suggests that cleavage of DAT by calpain may significantly modify dopamine homeostasis under pathological or physiological conditions.

journal_name

Neurochem Int

authors

Franekova V,Baliova M,Jursky F

doi

10.1016/j.neuint.2008.04.001

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

1436-41

issue

8

eissn

0197-0186

issn

1872-9754

pii

S0197-0186(08)00064-8

journal_volume

52

pub_type

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