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RSU1
RSU1 Full Name
Ras suppressor protein 1
RSU1 Introduction
Ras suppressor protein 1 (RSU1), also known as Ras suppressor-1, is a leucine-rich repeat (LRR)-containing protein encoded by the RSU1 gene located on chromosome 10p13. As a 33 kDa protein consisting of 277 amino acids, RSU1 was originally identified as a suppressor of Ras-dependent transformation, but subsequent studies have revealed that its biological functions extend far beyond Ras regulation. RSU1 is a critical component of the integrin-linked kinase (ILK)-PINCH-parvin (IPP) complex, where it interacts with the LIM5 domain of PINCH1 through its LRR region and localizes to focal adhesions. This interaction allows RSU1 to participate in extracellular matrix sensing, actin cytoskeleton organization, and cell adhesion signaling. For researchers investigating cancer progression, metastasis, or cell migration mechanisms, RSU1 has emerged as an important regulatory molecule because it connects mechanical signals from the extracellular environment with intracellular pathways controlling cell behavior.
Functionally, RSU1 acts as a context-dependent regulator of cell proliferation, migration, invasion, and survival. Through its involvement in the IPP complex, RSU1 influences integrin-mediated signaling and cytoskeletal remodeling, while also regulating major signaling cascades including MEK-ERK and JNK pathways. Studies have shown that RSU1 depletion can enhance anchorage-independent growth, increase epithelial-to-mesenchymal transition (EMT), and promote migratory properties in lung adenocarcinoma cells, supporting its role as a tumor suppressor in certain cancer settings. In addition, RSU1 has been shown to interact with prohibitin 2 (PHB2), forming an RSU1-PHB2 signaling axis that regulates MEK-ERK activation during loss of cell adhesion and anoikis-related processes. These findings highlight that RSU1 is not simply a passive structural component of focal adhesions but an active signaling regulator involved in maintaining cellular homeostasis and controlling responses to changes in the tumor microenvironment.
The disease relevance of RSU1 is increasingly recognized, particularly in cancer biology where its function appears to be highly dependent on tumor type and cellular context. In lung adenocarcinoma, reduced RSU1 expression has been associated with poor prognosis, and experimental studies indicate that RSU1 loss promotes tumor cell motility, EMT, and malignant transformation, suggesting its potential value as a prognostic biomarker. However, in other cancers such as invasive breast cancer, hepatocellular carcinoma, and glioblastoma, RSU1 may display different regulatory patterns and has been linked to metastatic behavior through mechanisms involving cell migration pathways and downstream factors such as GDF15. Proteomic studies have also identified elevated RSU1 and IPP complex components in early multiple myeloma samples, indicating that RSU1 may serve as a potential biomarker candidate beyond solid tumors. Due to its dual roles in tumor suppression and metastasis regulation, RSU1 represents a promising research target for understanding cancer progression, identifying disease biomarkers, and developing strategies aimed at modulating adhesion-related signaling networks.
Alternate Names for RSU1
RSU1; Ras suppressor protein 1; ras suppressor protein 1; FLJ31034; RSP 1; rsu-1; ras suppressor protein 1 variant 1; ras suppressor protein 1 variant 2; ras suppressor protein 1 variant 3; RSP-1;
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