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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The Neuromuscular Junction01:19

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Gap Junctions01:37

Gap Junctions

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Related Experiment Video

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Measuring Neuromuscular Junction Functionality
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Recent insights into mammalian ER-PM junctions.

Yu-Ju Chen1, Carlo Giovanni Quintanilla1, Jen Liou1

  • 1Department of Physiology, UT Southwestern Medical Center, Dallas, TX 75390, USA.

Current Opinion in Cell Biology
|February 12, 2019
PubMed
Summary

Endoplasmic reticulum-plasma membrane (ER-PM) junctions are vital contact sites in cells. This review covers their structure, formation, and roles in cellular functions like calcium signaling and lipid transport.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Endoplasmic reticulum-plasma membrane (ER-PM) junctions are crucial subcellular sites facilitating inter-organelle communication.
  • These membrane contact sites play key roles in essential cellular processes such as excitation-contraction coupling, calcium influx, and lipid transfer.

Purpose of the Study:

  • To review recent advancements in understanding the 3D structure and spatial organization of ER-PM junctions in mammalian cells.
  • To elucidate the molecular mechanisms governing the formation and functions of these critical membrane contact sites.

Main Methods:

  • Literature review of recent studies on ER-PM junctions.
  • Analysis of structural and molecular data from mammalian cell research.

Main Results:

  • Recent insights reveal complex 3D architectures of ER-PM junctions.
  • Molecular mechanisms underlying junction formation and function are increasingly understood.

Conclusions:

  • ER-PM junctions are dynamic platforms essential for cellular physiology.
  • Further research into their structure and molecular regulation will enhance understanding of cellular signaling and homeostasis.