The eukaryotic elongation factor eEF1A1 interacts with SAMHD1.

Mutations in SAMHD1 cause Aicardi-Goutieres syndrome (AGS), a Mendelian inflammatory disease which displays remarkable clinical and biochemical overlap with congenital viral infection. SAMHD1 (SAM domain and HD domain-containing protein 1) has also been defined as an HIV-1 restriction-factor that, through a novel triphosphohydrolase activity, inhibits early stage HIV-1 replication in ...
myeloid-derived dendritic cells (MDDCs), macrophages and resting CD4+ T-cells. The potent activity of SAMHD1 is likely to be the subject of a variety of regulatory mechanisms. Knowledge of proteins that interact with SAMHD1 may not only enhance our understanding of the pathogenesis of AGS, but may also provide further details on the link between the regulation of cellular dNTPs and HIV-1 restriction. In the present study, we used a yeast two-hybrid screen and pull-down analysis followed by MS to identify the eukaryotic elongation factor 1A1 (eEF1A1) as a potential interaction partner of SAMHD1. This interaction was confirmed by unbiased co-immunoprecipitation and demonstrated in situ by a proximity ligation assay (PLA). We show that this interaction is enhanced in mutant SAMHD1 cell lines and suggest that eEF1A1 may mediate SAMHD1 turnover by targeting it to the proteosome for degradation through association with Cullin4A and Rbx1.
Mesh Terms:
Autoimmune Diseases of the Nervous System, Carrier Proteins, Cell Line, Cullin Proteins, Fibroblasts, Gene Expression Regulation, Humans, Immunoprecipitation, Monocytes, Monomeric GTP-Binding Proteins, Mutation, Nervous System Malformations, Peptide Elongation Factor 1, Proteasome Endopeptidase Complex, Protein Binding, Proteolysis, Signal Transduction, Transcription Elongation, Genetic, Two-Hybrid System Techniques
Biochem. J.
Date: Feb. 15, 2015
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