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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
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GPR50 regulates neuronal development as a mitophagy receptor.

Ji-Chuan Liu1,2,3, Xiu-Yun Zhao1,2, Ming-Lei Wu1,2

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G protein-coupled receptor 50 (GPR50) acts as a novel mitophagy receptor, crucial for maintaining mitochondrial health in developing neurons. Its deficiency impairs energy production and neuronal development, highlighting GPR50

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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Area of Science:

  • Neuroscience
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Neurons require substantial mitochondrial energy for development.
  • Maintaining mitochondrial quality via mitophagy is essential for neuronal function.
  • The precise mechanisms of mitophagy in developing neurons remain incompletely understood.

Purpose of the Study:

  • To identify novel mitophagy receptors involved in neuronal development.
  • To elucidate the role of G protein-coupled receptor 50 (GPR50) in mitochondrial quality control.
  • To investigate the impact of GPR50 deficiency on neuronal energy metabolism and development.

Main Methods:

  • Investigated GPR50's interaction with LC3 and its recruitment to mitochondria under stress.
  • Utilized cell culture models and GPR50-deficient mice to study mitophagy and neuronal development.
  • Assessed mitochondrial oxidative phosphorylation (OXPHOS), ATP production, and reactive oxygen species (ROS) generation.
  • Evaluated behavioral changes in GPR50-deficient mice and rescue effects of antioxidant treatment.

Main Results:

  • GPR50 identified as a novel mitophagy receptor with an LC3-interacting region (LIR).
  • GPR50 is recruited to depolarized mitochondria during mitophagy stress, facilitating autophagosome engulfment.
  • GPR50 deficiency leads to damaged mitochondria, impaired OXPHOS, reduced ATP, and increased ROS.
  • GPR50-deficient mice show impaired social recognition, which is rescued by prenatal mitoQ treatment.

Conclusions:

  • GPR50 is a critical mitophagy receptor essential for maintaining mitochondrial OXPHOS in developing neurons.
  • Dysfunctional GPR50-mediated mitophagy impairs neuronal development and function.
  • Targeting GPR50 or mitochondrial health may offer therapeutic strategies for neurodevelopmental disorders.