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When HEK293T cells were transfected with plasmid of parkin with single site mutation (Cys241A, Cys260A, Cys323A), ubiquitination of DMT1 was also inhibited. However, the cells cotransfected with plasmids containing all three mutations, GSNO treatment did not affect the ubiquitination of DMT1. The expression of SNO-parkin and DMT1 protein in substantia nigra increased significantly gradually after 2 h, 4 h and 24 h with MPTP injection. These results indicate that the S-nitrosylation of parkin inhibits its E3 ubiquitin ligase activity for
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