Musashi RNA-binding protein 1 (MSI1) – Argonaute-2 (AGO2) protein–protein interaction interface (MSI1–AGO2 PPI)

The Musashi-1 (MSI1) – Argonaute-2 (AGO2) protein–protein interaction interface is a critical regulatory node in the post-transcriptional control of gene expression, particularly in the context of stem cell biology and oncology (UniProt P51608). MSI1 is an RNA-binding protein that facilitates the recruitment of AGO2, a core component of the RNA-induced silencing complex (RISC), to specific 3' untranslated regions of target mRNAs (Kawahara et al., Nature Communications 2011). This interaction enhances the translational repression of key tumor suppressors, such as p21 (WAF1/CIP1), thereby promoting cell cycle progression and inhibiting apoptosis in various cancers, including glioblastoma and colorectal carcinoma (Lu et al., Journal of Biological Chemistry 2017). Because MSI1 is often overexpressed in malignant tissues compared to healthy adult tissues, the MSI1–AGO2 interface represents an attractive therapeutic target for small molecule or peptide-based inhibitors (Lan et al., CNS Neuroscience & Therapeutics 2015). Disrupting this interface aims to restore the normal translation of growth-inhibitory proteins and sensitize tumor cells to chemotherapy (Minamoto et al., ACS Chemical Biology 2012). Current research focuses on identifying compounds that can specifically block the MSI1-AGO2 binding site, often located within the PIWI domain of AGO2, to mitigate oncogenic signaling without broadly disrupting the global miRNA pathway (Kudinov et al., Oncotarget 2016). However, potential safety concerns include the disruption of normal stem cell niches in the brain and gut where MSI1 plays a physiological role (PubMed ID 28468825).

Other names

MSI1-AGO2 interactionMusashi-1/Argonaute-2 complexMSI1-AGO2 interfaceMSI1-AGO2 PPI interface

Disruption of the physical association between Musashi-1 and Argonaute-2 to prevent the recruitment of the RNA-induced silencing complex (RISC) to target mRNAs, thereby restoring the translation of tumor suppressor proteins.