Apoorva Pai Kalasa Anil Kumar, Suhail Subair, Prathik Basthikoppa Shivamurthy, Samseera Ummar, Athira C. Rajeev, Rajesh Raju
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Decoding ATXN2 Phosphocode: Structural Insights and Therapeutic Opportunities in Disease
Ataxin-2 (ATXN2), a key RNA-binding protein, regulates RNA metabolism, stress granule formation, and neuronal homeostasis, with dysregulated phosphorylation contributing to Spinocerebellar Ataxia type 2 (SCA2), amyotrophic lateral sclerosis (ALS), and cancer. This review integrates structural biology, phosphoproteomics, and interactome analyses to map six critical phosphosites (S772, T741, S624, S684, S784, S889) within ATXN2’s intrinsically disordered regions. Modulated by kinases GSK3β and CDK13 and phosphatases like INPP5F, these sites orchestrate interactions with RNA-binding partners (e.g., ATXN2L, FXR2, STAU2) and co-regulated proteins (e.g., TP53BP1, NUP153), driving pathogenesis through disrupted autophagy, nucleocytoplasmic transport, and stress granule dynamics. We propose targeted therapies, including GSK3β inhibitors for ALS, antisense oligonucleotides for SCA2, and MTOR modulators for cancer, to restore ATXN2 function. By elucidating phosphocode of ATXN2, this work highlights novel avenues for precision medicine in neurodegenerative and oncogenic diseases.
期刊介绍:
The Protein Journal (formerly the Journal of Protein Chemistry) publishes original research work on all aspects of proteins and peptides. These include studies concerned with covalent or three-dimensional structure determination (X-ray, NMR, cryoEM, EPR/ESR, optical methods, etc.), computational aspects of protein structure and function, protein folding and misfolding, assembly, genetics, evolution, proteomics, molecular biology, protein engineering, protein nanotechnology, protein purification and analysis and peptide synthesis, as well as the elucidation and interpretation of the molecular bases of biological activities of proteins and peptides. We accept original research papers, reviews, mini-reviews, hypotheses, opinion papers, and letters to the editor.