PRMT1-mediated arginine methylation controls ATXN2L localization

Area of Science:

• Molecular Biology
• Cellular Biology
• Neuroscience

Background:

• Arginine methylation is a crucial posttranslational modification regulating cellular functions.
• Ataxin-2-like (ATXN2L) is the paralog of ataxin-2, a protein linked to spinocerebellar ataxia type 2.

Purpose of the Study:

• To investigate the arginine methylation status of ATXN2L.
• To determine the functional significance of ATXN2L methylation, particularly its role in protein localization.

Main Methods:

• Proteomic mass spectrometry to confirm ATXN2L methylation.
• In vivo experiments to assess ATXN2L localization under methylation inhibition.
• Co-immunoprecipitation to identify interacting proteins, including PRMT1.
• Site-directed mutagenesis of arginine-glycine-rich motifs.

Main Results:

• ATXN2L was confirmed to be asymmetrically dimethylated in vivo.
• Inhibition of methylation altered the nuclear localization of ATXN2L.
• ATXN2L was found to associate with protein arginine-N-methyltransferase 1 (PRMT1).
• Neither mutation of ATXN2L's RG-rich motifs nor methylation inhibition affected its stress granule localization.

Conclusions:

• Arginine methylation influences ATXN2L's nuclear localization.
• Methylation of ATXN2L is likely not essential for its localization to stress granules.