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Related Concept Videos

The Proteasome Structure01:17

The Proteasome Structure

The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
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Related Experiment Video

Updated: May 20, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Architectural and thermodynamic principles underlying intramembrane protease function.

Rosanna P Baker1, Sinisa Urban

  • 1Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Nature Chemical Biology
|July 17, 2012
PubMed
Summary
This summary is machine-generated.

Intramembrane proteases, like rhomboid proteases, have low stability, enabling environmental responsiveness for signaling. Their architecture suggests localized protein dynamics drive intramembrane proteolysis.

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Determining Membrane Protein Topology Using Fluorescence Protease Protection (FPP)
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Last Updated: May 20, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

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Published on: January 16, 2016

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
09:57

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Determining Membrane Protein Topology Using Fluorescence Protease Protection (FPP)
08:14

Determining Membrane Protein Topology Using Fluorescence Protease Protection (FPP)

Published on: April 20, 2015

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Intramembrane proteases are crucial signaling enzymes found across all life forms.
  • Understanding their architecture is key to deciphering their function and disease relevance.

Purpose of the Study:

  • To investigate the structural and thermodynamic properties of rhomboid proteases.
  • To elucidate the architectural strategies enabling intramembrane proteolysis.

Main Methods:

  • Utilized quantitative, high-throughput thermal light-scattering technology.
  • Employed reversible equilibrium unfolding/refolding and protease assays on 151 purified rhomboid variants.

Main Results:

  • Rhomboid proteases exhibit low intrinsic thermodynamic stability (2.1-4.5 kcal mol(-1)) due to weak transmembrane interactions.
  • Stability is influenced by specific amino acid residues (glycines, leucines) and hydrogen bonds.
  • Transmembrane segment 5 and associated loops appear less structurally constrained, indicating localized dynamics during proteolysis.

Conclusions:

  • Rhomboid protease stability is finely tuned for environmental responsiveness.
  • Intramembrane proteolysis likely involves dynamic conformational changes within the enzyme.
  • This study provides a detailed physiochemical map of membrane-bound enzyme function.