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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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AdipoR1 promotes pathogenic Th17 differentiation by regulating mitochondrial function through FUNDC1.

Hui Wang1, Qian Zhang1, Yuankai Sun1

  • 1Department of Rheumatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China.

Journal of Biomedical Research
|November 7, 2024
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Adiponectin receptor 1 (Adipor1) deficiency impairs pathogenic Th17 cell differentiation by affecting mitochondrial function via FUNDC1. This finding offers new therapeutic targets for autoimmune and inflammatory diseases.

Keywords:
AdipoR1FUNDC1mitochondrial functionpTh17

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Area of Science:

  • Immunology
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Pathogenic Th17 (pTh17) cells are crucial in autoimmune diseases.
  • Adiponectin receptor 1 (Adipor1) deficiency inhibits Th17 differentiation and reduces arthritis.
  • Adipor1 affects mitochondrial function and pTh17 differentiation.

Purpose of the Study:

  • To investigate the role of Adipor1 in pTh17 cell differentiation and mitochondrial function.
  • To explore the underlying molecular mechanisms involving FUNDC1.

Main Methods:

  • In vitro differentiation of Th17 cells.
  • Mitochondrial function assays.
  • RNA sequencing (RNA-seq) analysis.
  • Gene interference studies.

Main Results:

  • Adipor1 deficiency inhibited pTh17 differentiation in vitro.
  • Adipor1 deletion in pTh17 cells reduced mitochondrial function.
  • Adipor1 deficiency increased FUNDC1 expression in CD4+ T cells.
  • FUNDC1 interference partially reversed the effects of Adipor1 deficiency.

Conclusions:

  • Adipor1 regulates mitochondrial function through FUNDC1 to promote pTh17 cell differentiation.
  • This study identifies a novel mechanism for AdipoR1 in immune regulation.
  • AdipoR1 and FUNDC1 represent potential therapeutic targets for autoimmune and inflammatory diseases.