Reaching for the stars: Linking RNA binding proteins to diseases

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Sam68 is a prototype STAR (Signal Transduction and Activation of RNA) protein.
• STAR proteins belong to the hnRNP K homology (KH) domain family of RNA-binding proteins.
• The KH domain is a conserved RNA binding domain crucial for RNA-protein interactions.

Purpose of the Study:

• To discuss the role of Sam68 and its family member, quaking (QKI).
• To explore the significance of the KH domain in RNA binding and disease.
• To highlight the link between Sam68, RNA metabolism, and human diseases.

Main Methods:

• Review of existing literature on Sam68 and STAR proteins.
• Analysis of Sam68's structure, function, and post-translational modifications.
• Examination of physiological roles and disease associations.

Main Results:

• Sam68 possesses a single KH domain with additional RNA-binding sequences.
• Post-translational modifications, like phosphorylation, affect Sam68's RNA binding activity.
• Sam68 is implicated in osteoporosis, cancer, infertility, and ataxia in mice.

Conclusions:

• Sam68 acts as a STAR protein, integrating extracellular signals to regulate RNA metabolism.
• The KH domain and Sam68 family members are critical in various biological processes.
• Dysregulation of Sam68 and related proteins contributes to human diseases.