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Related Concept Videos

Lysosomes01:31

Lysosomes

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Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Delivery Pathways to the Lysosome01:36

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
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Lysosomal Hydrolases01:22

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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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Intralumenal Vesicles and Multivesicular Bodies01:38

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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Eukaryotic resectosomes: A single-molecule perspective.

Logan R Myler1, Ilya J Finkelstein1

  • 1Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, 78712, USA; Center for Systems and Synthetic Biology, The University of Texas at Austin, Austin, TX, 78712, USA.

Progress in Biophysics and Molecular Biology
|August 8, 2016
PubMed
Summary
This summary is machine-generated.

This study explores how protein complexes called resectosomes repair DNA double-strand breaks (DSBs) using single-molecule techniques. Understanding these mechanisms is crucial for preventing genome instability and cancer.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA double-strand breaks (DSBs) threaten genome integrity and can lead to cancer.
  • Homologous recombination (HR) is a critical error-free repair pathway for DSBs.
  • The resectosome complex initiates HR by processing DNA ends.

Purpose of the Study:

  • To elucidate the mechanisms of DNA resection by the resectosome.
  • To highlight the contribution of single-molecule studies in understanding resectosome function.
  • To identify key proteins regulating DNA end processing for HR.

Main Methods:

  • Focus on recent single-molecule biophysical techniques.
  • Analysis of eukaryotic resectosome components including helicases and nucleases.
  • Investigating protein interactions and DNA processing dynamics.

Main Results:

  • Single-molecule studies reveal how resectosome components control DNA resection extent and efficiency.
  • Detailed characterization of nucleases, helicases, and regulatory factors in DNA repair.
  • Insights into the dynamic assembly and function of the resectosome.

Conclusions:

  • Single-molecule approaches provide unprecedented resolution of DNA repair processes.
  • Understanding resectosome dynamics is key to comprehending genome stability.
  • Further single-molecule studies are needed to address outstanding questions in DSB repair.