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Related Concept Videos

The Chain Rule: Problem Solving01:23

The Chain Rule: Problem Solving

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The thermal expansion of a metal rod shows the application of the Chain Rule when one physical quantity depends on another that varies with time. As the rod is heated, its length changes according to linear thermal expansion, while the temperature of the system varies quadratically with time.For linear thermal expansion, the length L of the rod depends on temperature T such that the rate of change of length with respect to temperature is constant:where L0 = 2 m is the initial length of...
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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Related Experiment Video

Updated: Feb 6, 2026

Measuring Enzymatic Activity of Neurodevelopmental Disorder-Associated Deubiquitylating Enzymes via an In Vitro Ubiquitin Chain Cleavage Assay
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Ubiquitin in chains.

C M Pickart1

  • 1Dept of Biochemistry and Molecular Biology, School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA. cpickart@welchlink.welch.jhu.edu

Trends in Biochemical Sciences
|November 21, 2000
PubMed
Summary

The ubiquitin-proteasome system degrades proteins using specific polyubiquitin chains. Recent findings clarify how proteasomes recognize these chains, explaining this key cellular signaling mechanism.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The ubiquitin-proteasome system (UPS) is vital for eukaryotic protein homeostasis.
  • The UPS regulates intracellular protein levels by targeting proteins for degradation.
  • Polyubiquitin chains serve as signals for substrate recognition by the proteasome.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying polyubiquitin-chain recognition by the 26S proteasome.
  • To identify key determinants involved in substrate targeting for proteasomal degradation.
  • To explain the biological significance of specific polyubiquitin chain signaling.

Main Methods:

  • Biochemical assays to study protein-ubiquitination.
  • Structural biology techniques to analyze proteasome-ubiquitin interactions.

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Related Experiment Videos

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  • Cellular experiments to validate findings in a biological context.

    • Main Results:

    • Identified specific features of polyubiquitin chains crucial for proteasome binding.
    • Characterized the molecular interactions between proteasome subunits and ubiquitin chains.
    • Demonstrated the functional importance of these recognition determinants in protein degradation.

    Conclusions:

    • Polyubiquitin chain structure is a critical determinant for proteasome recognition.
    • Understanding these interactions provides insight into the regulation of protein degradation.
    • This knowledge advances our comprehension of the ubiquitin-proteasome system's role in cellular processes.