Receptor for activated C kinase 1 (RACK1) (RACK1)

Receptor for activated C kinase 1 (RACK1) is a highly conserved scaffolding protein belonging to the WD40 repeat family, structurally resembling the G-protein beta subunit (UniProt P63244). It serves as a central hub for integrating diverse signaling pathways by interacting with a wide array of partners, including protein kinase C (PKC), Src family kinases, and various transmembrane receptors (Cell Communication and Signaling, 2011). Beyond its role in signal transduction, RACK1 is an integral component of the 40S ribosomal subunit, where it facilitates the recruitment of signaling molecules to the translation machinery, thereby regulating protein synthesis (Nature, 2013). In the context of transcriptional regulation, RACK1 can translocate to the nucleus to interact with transcription factors and chromatin modifiers, influencing the expression of genes related to cell growth and stress responses (Journal of Experimental & Clinical Cancer Research, 2015). RACK1 is frequently overexpressed in various cancers, such as breast, lung, and hepatocellular carcinoma, where it promotes tumor progression, metastasis, and chemoresistance (Expert Opinion on Therapeutic Targets, 2014). Although no RACK1-targeted therapies are currently approved, experimental approaches using small molecules like SD-29 or peptide mimetics aim to disrupt specific protein-protein interactions to inhibit its oncogenic functions (Oncotarget, 2016).

Other names

GNB2L1Guanine nucleotide-binding protein subunit beta-2-like 1HLC-7Protein kinase C-binding protein 1

Inhibition of protein-protein interactions (PPI) and disruption of scaffolding function