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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Co-activators and Co-repressors02:04

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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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tRNA Activation02:26

tRNA Activation

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Activation Energy01:26

Activation Energy

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Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
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Eukaryotic Transcription Activators02:42

Eukaryotic Transcription Activators

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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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Related Experiment Video

Updated: Jan 25, 2026

Assaying for Inorganic Polyphosphate in Bacteria
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Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

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Polyphosphates and Complement Activation.

Edward M Conway1

  • 1Division of Hematology, Department of Medicine, Faculty of Medicine, Centre for Blood Research, Life Sciences Institute, University of British Columbia, Vancouver, BC, Canada.

Frontiers in Medicine
|April 26, 2019
PubMed
Summary
This summary is machine-generated.

Organisms use rapid wound healing strategies involving coagulation and complement pathways. Cell-secreted polyphosphate balances these systems, offering new therapeutic insights for healing and immunity.

Keywords:
C1-esterase inhibitorage-related macular degenerationcoagulationinflammationinnate immunitymembrane attack complexmouse modelsthrombosis

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Area of Science:

  • Immunology
  • Biochemistry
  • Cell Biology

Background:

  • Organisms possess innate protective strategies for wound repair, involving coordinated molecular, biochemical, and cellular pathways.
  • Dysregulation of these pathways can result in impaired healing, disease, or host demise.
  • Coagulation and complement systems, crucial for immunity and wound repair, have recently shown interconnectedness.

Purpose of the Study:

  • To investigate the intricate relationship between the coagulation and complement systems in innate immunity.
  • To elucidate the role of cell-secreted polyphosphate in modulating these interconnected pathways.
  • To explore the potential of these discoveries for novel therapeutic strategies.

Main Methods:

  • The study focuses on the molecular mechanisms linking coagulation and complement.
  • It examines the function of cell-secreted polyphosphate in regulating these pathways.
  • Insights are derived from recent advances in understanding these biological systems.

Main Results:

  • Cell-secreted polyphosphate was found to promote coagulation.
  • Polyphosphate was also observed to dampen complement activation.
  • This dual action highlights a critical regulatory link between the two systems.

Conclusions:

  • The interplay between coagulation and complement, mediated by polyphosphate, is a key aspect of innate protective strategies.
  • Understanding this linkage provides novel insights into disease mechanisms.
  • These findings suggest potential new therapeutic avenues for managing wound healing and immune-related disorders.