SAM68 (Src-associated in mitosis 68 kDa) is a RNA-binding protein belonging to the STAR (signal transduction and activation of RNA) family, initially identified through its interaction with Src tyrosine kinase during mitosis. It plays a multifaceted role in RNA metabolism, including splicing, transport, translation, and stability regulation by binding to specific RNA motifs. SAM68 contains a conserved KH (hnRNP K homology) domain essential for RNA interaction and multiple phosphorylation sites that modulate its activity in response to cellular signals, such as growth factors or stress.
This protein is implicated in diverse cellular processes, such as cell cycle progression, apoptosis, and differentiation. Studies highlight its involvement in cancer progression, particularly hormone-dependent cancers (e.g., breast and prostate), where it regulates alternative splicing of oncogenic transcripts. SAM68 also interacts with viral RNAs (e.g., HIV) and participates in viral replication.
Antibodies against SAM68 are widely used to investigate its expression, localization, and molecular interactions. They aid in detecting SAM68 in tissues or cell lines via techniques like Western blot, immunohistochemistry, or immunofluorescence. Research using these antibodies has revealed post-translational modifications (e.g., phosphorylation, methylation) that dynamically regulate SAM68’s functions. Dysregulation of SAM68 is linked to pathological conditions, making it a potential therapeutic target. These antibodies remain critical tools for exploring SAM68’s roles in RNA biology and disease mechanisms.