RPL23A (Ribosomal Protein L23a) is a component of the 60S ribosomal subunit. RPL23A is involved in translation and has been implicated in p53 regulation. Mutations cause Diamond-Blackfan anemia. In neurodegeneration, ribosomal stress can trigger integrated stress responses affecting neuronal survival.
Ribosomal Protein L23a (RPL23A) is a highly conserved protein that is part of the large (60S) ribosomal subunit in eukaryotes. The RPL23A gene encodes a protein of approximately 17.8 kDa that is expressed in all cell types, with particular importance in tissues undergoing active cell division and protein synthesis. This ribosomal protein is located at the surface of the 60S subunit and contributes to the structural framework that supports the translational machinery.
RPL23A belongs to the ribosomal protein L23 family, which is characterized by a unique zinc-finger-like domain that facilitates nucleic acid binding. This domain allows RPL23A to interact directly with ribosomal RNA (rRNA), specifically the 28S rRNA component of the large subunit. Through these interactions, RPL23A helps maintain the proper conformation of the ribosome and participates in the peptidyl transferase reaction that catalyzes peptide bond formation during protein synthesis.
Beyond its essential role in translation, RPL23A has been discovered to have extraribosomal functions that connect ribosomal biology to fundamental cellular processes. Notably, RPL23A can interact with MDM2, a key E3 ubiquitin ligase that regulates p53 stability. This interaction links ribosomal stress to the p53-dependent DNA damage response pathway, providing a mechanism by which disruptions in ribosome biogenesis can lead to cell cycle arrest or apoptosis.
RPL23A has a zinc-finger-like domain that may be involved in nucleic acid binding. The protein contacts the 28S rRNA.
RPL23A is a component of the 60S ribosomal subunit. Beyond translation, it has been shown to interact with MDM2 and regulate p53 stability. This links ribosomal function to cell cycle control and apoptosis.
Mutations cause Diamond-Blackfan anemia. The protein has been implicated in the DNA damage response through p53 regulation.
No direct therapeutic targeting. Understanding RPL23A function may inform ribosomopathy therapies.
The study of Ribosomal Protein L23A has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.