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Related Concept Videos

Peroxisomes01:24

Peroxisomes

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Peroxisomes01:24

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Protein Import into the Peroxisomes01:27

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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Peroxisomes and Mitochondria01:30

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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Protein Modifications in the RER01:26

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Cell Signaling in Plants01:25

Cell Signaling in Plants

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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ROS Generation in Peroxisomes and its Role in Cell Signaling.

Luis A Del Río1, Eduardo López-Huertas2

  • 1Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Department of Biochemistry and Cell & Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (CSIC), Apartado 419, E-18080 Granada, Spain luisalfonso.delrio@eez.csic.es.

Plant & Cell Physiology
|April 16, 2016
PubMed
Summary
This summary is machine-generated.

Plant peroxisomes are key sites for producing hydrogen peroxide (H₂O₂) and possess robust antioxidant systems. They play crucial roles in cellular redox homeostasis and responding to environmental stresses.

Keywords:
Cell metabolismHydrogen peroxide (H2O2)PeroxisomesROS generationROS signalingSuperoxide radicals (O2·–)

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Area of Science:

  • Plant cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Peroxisomes are vital organelles in eukaryotic cells, known for oxidative metabolism and hydrogen peroxide (H₂O₂) production.
  • While H₂O₂ generation and catalase presence in peroxisomes are established, superoxide radical (O₂⁻) production and superoxide dismutase were newly identified in plant peroxisomes.

Purpose of the Study:

  • To present evidence of reactive oxygen species (ROS) production in plant peroxisomes.
  • To describe the antioxidant systems within these organelles and their functions.
  • To explore the role of peroxisomes in abiotic stress responses and cellular redox homeostasis.

Main Methods:

  • Review of existing evidence on ROS production in peroxisomes.
  • Characterization of antioxidant systems in plant peroxisomes.
  • Analysis of peroxisome dynamics and proteome related to ROS metabolism.

Main Results:

  • Plant peroxisomes generate superoxide radicals (O₂⁻) and possess superoxide dismutase, alongside other antioxidant systems beyond catalase.
  • Peroxisomes are implicated in ROS-mediated responses to heavy metal (cadmium) and xenobiotic (2,4-D) stress, and in leaf senescence.
  • ROS production in peroxisomes can be regulated by post-translational protein modifications.

Conclusions:

  • Peroxisomes are significant cellular sources of ROS and signaling molecules, crucial for physiological processes.
  • These organelles play a key role in maintaining cellular redox homeostasis.
  • Peroxisome function and ROS metabolism are affected by environmental toxins like cadmium and 2,4-D.