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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
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T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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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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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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Related Experiment Video

Updated: Feb 12, 2026

Author Spotlight: Decoding Mitochondrial Aging
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Author Spotlight: Decoding Mitochondrial Aging

Published on: June 30, 2023

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Visualizing biochemical activities in living cells.

Kai Johnsson1

  • 1Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. kai.johnsson@epfl.ch

Nature Chemical Biology
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

New chemical probes and labeling methods are crucial for advancing cell biology research. Chemical biologists can drive progress in visualizing and quantifying cellular biochemical activities beyond current autofluorescent protein capabilities.

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Area of Science:

  • Cell biology
  • Chemical biology
  • Biochemistry

Background:

  • Autofluorescent proteins are essential tools for visualizing molecular events in living cells.
  • Current methods limit the comprehensive visualization and quantification of cellular biochemical activities.

Purpose of the Study:

  • To highlight areas needing novel probes and labeling methods for enhanced cellular analysis.
  • To identify opportunities for chemical biologists to contribute to visualization techniques.

Main Methods:

  • Review of current limitations in cellular visualization techniques.
  • Identification of key research areas for new probe development.

Main Results:

  • Autofluorescent proteins, while valuable, have limitations for comprehensive cellular analysis.
  • Significant need exists for complementary sensing and probing methods.

Conclusions:

  • Advancing the visualization and quantification of cellular biochemical activities requires new chemical probes and labeling strategies.
  • Chemical biologists are well-positioned to develop these innovative tools for cell biology.