Abstract
Mitochondrial translation system executes the biosynthesis of mitochondrial DNA encoded polypeptides that are the core subunits of oxidative phosphorylation complexes. Recently, we reported that elongation factor 4 (EF4) is a key quality control factor in bacterial and mitochondrial translation regulating tRNA translocation and modulating cellular responses via a direct cross-talk with cytoplasmic translation machinery. Here, we made a brief review on mtEF4-regulated mitochondrial translation, respiratory chain biogenesis and the production of reactive oxygen species (ROS). We will discuss the influence of mtEF4 on the electron transport chain, especially at respiratory chain complex IV, which could result in cytochrome c peroxidase formation, electron leakage from electron transport chain and ROS increase.
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