Ribosomal protein, Structural constituent of ribosome, Component of the large (60S) ribosomal subunit, Member of the L15E family of ribosomal proteins
01
Overview
60S ribosomal protein L15 is a highly conserved structural protein that forms part of the large subunit (60S) of eukaryotic ribosomes, essential for cellular protein synthesis[3][5]. RPL15 participates in ribosome assembly, rRNA maturation, and nucleolar function[1][2]. Its gene (RPL15) encodes a cytoplasmic protein, which is upregulated in several cancers (notably colon, esophageal, and gastric) and is deleted in some patients with Diamond-Blackfan anemia[1][5]. Elevated RPL15 expression in cancers is linked with increased cell proliferation and poor prognosis, while experimental depletion induces cell cycle arrest or apoptosis, supporting its consideration as a novel cancer biomarker and therapeutic target[1][3][5].
Other names
Ribosomal protein L15RPL15RL1560S ribosomal protein L15ribosome protein L15
02
Mechanism of action
Induction of ribosomal stress: Small molecule depletion or knockdown approaches can cause disruption of ribosome assembly leading to cell cycle arrest or apoptosis. Future approaches may aim to selectively target cancers overexpressing RPL15, leveraging its role in nucleolar structure and ribosome biogenesis.
03
Biological functions
Ribosome biogenesis: Required for the assembly and formation of pre-60S ribosomal subunits in the nucleolusProtein synthesis: Component of the ribosome, essential for mRNA-directed translationrRNA processing: Participates in rRNA maturation events necessary for ribosome functionMaintenance of nucleolar structure: Involved in maintaining nucleolar integrityCell proliferation: Associated with increased proliferation in several cancer typesRegulation of cell cycle and apoptosis: Depletion leads to cell cycle arrest and can induce apoptosis, especially in cancer cells
04
Disease associations
Cancer: Overexpressed in colon, esophageal, and gastric cancers; associated with cancer progressionDiamond-Blackfan anemia: Deletion or reduced expression linked to this congenital bone marrow failure syndromeOther: Downregulated in some cancers (cutaneous squamous cell carcinoma, pancreatic ductal adenocarcinoma), indicating context-dependent disease association
05
Safety considerations
Targeting RPL15 or the ribosome broadly risks impairing general protein synthesis, which could harm healthy, proliferating cells.Specificity to cancer cells overexpressing RPL15 is a major therapeutic challenge; risk of hematological toxicities (e.g., anemia) due to ribosomal dysfunction
06
Interacting drugs
No direct drugs currently approved or routinely used that target RPL15 specifically, but it is under experimental investigation as a potential cancer therapeutic target or biomarker
1 more in the full profile.
07
Biomarkers
RPL15 overexpression is proposed and under investigation as a clinical biomarker for colon cancer disease progression and therapy responseIts expression may also be monitored in Diamond-Blackfan anemia diagnosis and research
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