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Related Concept Videos

Activation of Integrins01:15

Activation of Integrins

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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Integrins01:10

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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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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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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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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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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Related Experiment Video

Updated: Sep 29, 2025

Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
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Emerging insights into the function and structure of the Integrator complex.

Moritz M Pfleiderer1, Wojciech P Galej1

  • 1European Molecular Biology Laboratory, Grenoble, France.

Transcription
|March 21, 2022
PubMed
Summary

The Integrator complex processes various RNA types, including small nuclear RNAs (snRNAs) and messenger RNAs (mRNAs). Recent studies reveal its crucial role in regulating gene expression through transcription attenuation.

Keywords:
3’-end processingIntegratorRNAPIIcryo-EMendonucleasesnRNAtranscription attenuation

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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Gene Regulation

Background:

  • The Integrator complex was initially identified for its role in processing small nuclear RNAs (snRNAs).
  • Its substrate repertoire has expanded to include long noncoding RNAs (lncRNAs), enhancer RNAs (eRNAs), and viral transcripts.
  • Emerging evidence highlights Integrator's function in regulating protein-coding gene expression.

Purpose of the Study:

  • To summarize recent advancements in understanding the Integrator complex.
  • To consolidate knowledge on Integrator's structure and diverse functions.
  • To provide mechanistic insights into Integrator-mediated RNA processing.

Main Methods:

  • Literature review of recent transcriptome-wide studies.
  • Analysis of structural data for Integrator modules and complexes.
  • Integration of functional and structural findings.

Main Results:

  • Integrator processes a broad range of RNA substrates beyond snRNAs.
  • Integrator plays a significant role in promoter-proximal transcription attenuation of protein-coding genes.
  • Structural studies offer mechanistic explanations for Integrator's processing activities.

Conclusions:

  • The Integrator complex is a versatile regulator of RNA processing and gene expression.
  • Recent structural and functional data have significantly advanced our understanding of Integrator.
  • Integrator's role in transcription attenuation is a key mechanism for gene regulation.