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Large ribosomal subunit protein mL45, mitochondrial (MRPL45)
- Target
- MRPL45
- Molecular classification
- Ribosomal protein, Mitochondrial ribosomal protein, Structural component of the 39S (large) mitochondrial ribosome subunit, Other (not an enzyme, receptor, transporter, ion channel, transcription factor, or histone modifier)
01
Overview
Large ribosomal subunit protein mL45, mitochondrial (MRPL45), is a nuclear-encoded protein that becomes a constituent of the 39S large subunit of the mitochondrial ribosome. It facilitates mitochondrial translation by directing nascent polypeptides to the exit tunnel, ensuring proper passage and membrane association for co-translational protein insertion into the mitochondrial inner membrane. MRPL45 exhibits functional and sequence homology with yeast Mba1 and shares characteristics with Tim44, reflecting its evolutionary origins from alpha-proteobacteria. MRPL45 is essential for mitochondrial protein synthesis, with unique and non-redundant roles; loss of function usually results in profound cellular and developmental defects. Disruption of MRPL45 or other mitochondrial ribosomal proteins is linked to a spectrum of human diseases, mostly related to defects in cellular energy metabolism and mitochondrial translation, but MRPL45 is not a recognized or direct therapeutic target nor is it targeted by currently approved drugs.
- Other names
- MRPL45mL45Large ribosomal subunit protein mL4539S ribosomal protein L45, mitochondrialMRP-L45L45mtMGC11321Mba1 (yeast ortholog)
02
Mechanism of action
As MRPL45 is a structural protein, there are no mechanisms of action described for drugs targeting it.
03
Biological functions
Mitochondrial protein synthesisDirects nascent polypeptide chains toward the tunnel exit and positions the exit at a distance from the mitochondrial inner membranePotentially acts as a bridging factor between the mitoribosome and membrane-bound protein insertion machinery (Oxa1 complex)Essential for co-translational insertion of mitochondrial and nuclear-encoded proteins into the mitochondrial inner membraneStructural integrity and assembly of the large mitoribosomal subunit
04
Disease associations
Mitochondrial diseases (general association with mutations in mitochondrial ribosomal proteins, not MRPL45 specifically)Spinocerebellar ataxia 28Wolff-Parkinson-White syndrome (annotation link, but direct causality unclear; possibly due to chromosomal location overlap or non-coding variants)Disruption of MRPs can result in early embryonic lethality due to defective mitochondrial translationOther (no strong associations with cancer, inflammation, neurodegeneration, or infection reported for MRPL45 specifically)
05
Safety considerations
Loss of MRPL45 function (or other mitoribosomal protein genes) may cause severe mitochondrial dysfunction, embryonic lethality, or multi-system human disorders due to impaired mitochondrial translation and ATP production.Therapeutic targeting would likely result in general toxicity owing to disruption of fundamental cellular processes.
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