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Related Concept Videos

ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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ATP13A2 deficiency disrupts lysosomal polyamine export.

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ATP13A2 is identified as a lysosomal polyamine exporter crucial for cellular health. Its dysfunction, linked to neurodegenerative diseases like Parkinson's, impairs polyamine transport, leading to cell death.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • ATP13A2 (PARK9) is an endolysosomal transporter linked to neurodegenerative disorders such as Kufor-Rakeb syndrome and early-onset Parkinson's disease.
  • While ATP13A2 protects against Parkinson's disease risk factors and its loss compromises lysosomes, its specific transport function within lysosomes remains unknown.
  • Understanding ATP13A2's role is critical for elucidating mechanisms of neurodegeneration and lysosomal dysfunction.

Purpose of the Study:

  • To determine the transport function of ATP13A2 within lysosomes.
  • To investigate the role of ATP13A2 in polyamine transport and cellular toxicity.
  • To establish a link between defective lysosomal polyamine export and neurodegeneration.

Main Methods:

  • Biochemical assays using purified ATP13A2 to assess polyamine binding and transport kinetics.
  • Functional studies of ATP13A2 mutants associated with neurodegenerative diseases.
  • Cellular uptake experiments measuring polyamine transport via endocytosis and lysosomal pathways.
  • Analysis of cell toxicity, lysosomal integrity, and cathepsin B activation in response to polyamine levels and ATP13A2 expression.
  • In vivo studies in neurons and nematodes expressing ATP13A2 or its orthologues.

Main Results:

  • ATP13A2 functions as a lysosomal polyamine exporter with a high affinity for spermine.
  • Polyamines stimulate purified ATP13A2 activity, while disease-associated ATP13A2 mutants exhibit impaired function correlating with disease severity.
  • ATP13A2 facilitates cellular polyamine uptake via endocytosis and subsequent transport into the cytosol, indicating a role for endolysosomes in cellular polyamine acquisition.
  • High polyamine concentrations induce cell toxicity, which is exacerbated by ATP13A2 loss, leading to lysosomal dysfunction, rupture, and cathepsin B activation.
  • Impaired ATP13A2 expression in neurons and nematodes recapitulates the observed toxicity phenotype.

Conclusions:

  • Defective lysosomal polyamine export by ATP13A2 is identified as a mechanism for lysosome-dependent cell death.
  • This mechanism may contribute to the pathogenesis of neurodegenerative diseases.
  • The study elucidates the molecular identity of the mammalian polyamine transport system, providing new insights into cellular polyamine homeostasis and its disruption in disease.