RPS7

RPS7 Full Name

ribosomal protein S7

RPS7 Introduction

Ribosomal protein S7 (RPS7), also known as eS7 in eukaryotes, is a highly conserved component of the 40S small ribosomal subunit that plays a central role in mRNA decoding and protein synthesis. While traditionally recognized as a structural ribosomal protein, recent studies have demonstrated that RPS7 performs important extraribosomal functions that extend far beyond translation. Researchers now recognize RPS7 as an RNA-binding protein capable of regulating specific mRNA targets, coordinating ribosome quality control, and integrating cellular responses to environmental stress. This expanded understanding is particularly valuable for scientists investigating translational regulation, cancer biology, aging, and RNA-based therapeutics, where identifying multifunctional regulators is essential for uncovering disease mechanisms and developing new therapeutic strategies.

Beyond its structural contribution to ribosome assembly, RPS7 actively participates in multiple layers of translational control. As an RNA-binding protein, RPS7 selectively interacts with regulatory mRNAs, influencing their stability and downstream signaling pathways. Recent evidence demonstrates that RPS7 binds the 3' untranslated region of LOXL2 mRNA, enhancing transcript stability and increasing LOXL2 protein expression, which subsequently activates the ITGB1/FAK/SRC signaling cascade involved in cell adhesion, migration, and metastatic progression. In parallel, post-translational modification of RPS7 has emerged as an important mechanism controlling global protein synthesis. Monoubiquitination and deubiquitination of free 40S-associated RPS7 regulate translation initiation efficiency, with the deubiquitinase OTUD6 restoring RPS7 activity to promote efficient protein synthesis during physiological adaptation and cellular stress. Experimental studies further indicate that RPS7 ubiquitination functions as part of ribosome-associated quality control, allowing cells to selectively remodel translation in response to endoplasmic reticulum stress and other environmental challenges. Together, these findings position RPS7 as a dynamic regulator connecting ribosome function, RNA metabolism, stress adaptation, and translational homeostasis.

Increasing evidence also links abnormal RPS7 expression or dysregulated RPS7 signaling to human disease, particularly cancer. In hepatocellular carcinoma, elevated RPS7 expression correlates with poor clinical prognosis and enhanced metastatic potential. Mechanistically, RPS7 stabilizes LOXL2 mRNA, promoting extracellular matrix remodeling and activation of integrin-mediated signaling pathways that facilitate tumor invasion and distant metastasis. Beyond oncology, the regulation of RPS7 ubiquitination has attracted growing interest in aging and stress biology, as reduced OTUD6 expression during aging is associated with increased RPS7 ubiquitination and a progressive decline in global protein translation. Studies in yeast further demonstrate that stress-induced modification of the eS7 homolog controls selective mRNA translation during the unfolded protein response, highlighting an evolutionarily conserved mechanism for maintaining proteostasis under adverse conditions. Collectively, these discoveries establish RPS7 as more than a housekeeping ribosomal protein—it is an emerging regulator of RNA stability, translational control, cellular stress responses, and disease progression, making it an increasingly important target for mechanistic research, biomarker discovery, and future therapeutic development.

Alternate Names for RPS7

RPS7; ribosomal protein S7; 40S ribosomal protein S7; S7; DBA8;

• 1.Aseev LV, et al.; Extraribosomal Functions of Bacterial Ribosomal Proteins-An Update, 2023. Int J Mol Sci. 2024, 25(5):2957.
  2.Zhou YJ, et al.; RNA-binding protein RPS7 promotes hepatocellular carcinoma progression via LOXL2-dependent activation of ITGB1/FAK/SRC signaling. J Exp Clin Cancer Res. 2024, 43(1):45.