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Related Concept Videos

Insulin: The Receptor and Signaling Pathways01:28

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Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
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Introduction to Actin01:26

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

Updated: Oct 26, 2025

Analyzing the α-Actinin Network in Human iPSC-Derived Cardiomyocytes Using Single Molecule Localization Microscopy
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Microscopic image-based covariation network analysis for actin scaffold-modified insulin signaling.

Yoshiyuki Noguchi1, Fumi Kano2, Nobuhiko Maiya3

  • 1Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.

Iscience
|August 2, 2021
PubMed
Summary

We developed a novel Protein Localization and Modification-based Covariation Network (PLOM-CON) to visualize live protein networks. This method revealed actin scaffolds act as platforms for glycogenesis and protein synthesis during insulin signaling.

Keywords:
BioinformaticsMolecular networkSystems biology

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Proteomics

Background:

  • Understanding dynamic protein interactions in living cells is crucial for elucidating cellular functions.
  • Existing methods often lack the resolution to capture real-time protein network dynamics.
  • Post-translational modifications and localization are key determinants of protein function.

Purpose of the Study:

  • To develop a novel method for inferring live protein networks within single cells.
  • To visualize the temporal behavior of protein networks under specific cellular conditions.
  • To investigate the role of actin scaffolds in insulin signaling pathways.

Main Methods:

  • Developed Protein Localization and Modification-based Covariation Network (PLOM-CON) analysis.
  • Utilized quantitative data on protein abundance, post-translational modification state, and localization from immunostained images.
  • Applied PLOM-CON to rat hepatoma cells to study insulin signaling.

Main Results:

  • PLOM-CON successfully generated networks showing synchronized time-dependent protein behaviors.
  • The study visualized the development and changes of live protein networks.
  • Actin scaffolds were identified as potential platforms for glycogenesis and protein synthesis in response to insulin.

Conclusions:

  • The PLOM-CON method provides a powerful tool for analyzing live protein networks in single cells.
  • Actin scaffolds play a significant role in mediating cellular responses to insulin.
  • This approach enhances our understanding of dynamic cellular processes and signaling pathways.