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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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The Proteasome01:13

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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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

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Author Spotlight: Fluorescence-Based Quantification of Mitochondrial Membrane Potential and Superoxide Levels Using Live Imaging in HeLa Cells
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How phosphoubiquitin activates Parkin.

Xinde Zheng1, Tony Hunter1

  • 1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.

Cell Research
|August 12, 2015
PubMed
Summary

A new study reveals the structure of the Parkin-phosphoubiquitin complex, significantly advancing our understanding of how Parkin is activated.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Parkin is an E3 ubiquitin ligase crucial for mitophagy and cellular quality control.
  • Dysfunctional Parkin is linked to Parkinson's disease.
  • Understanding Parkin activation is key to developing therapeutic strategies.

Purpose of the Study:

  • To elucidate the structural basis of Parkin activation.
  • To investigate the interaction between Parkin and phosphoubiquitin.

Main Methods:

  • X-ray crystallography
  • Biochemical assays
  • Structural analysis

Main Results:

  • The structure of the Parkin-phosphoubiquitin complex was determined.

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  • Key interactions mediating Parkin activation were identified.
  • A detailed molecular model of the activation mechanism was proposed.

    • Conclusions:

    • The solved structure provides unprecedented insights into Parkin regulation.
    • This finding opens new avenues for therapeutic interventions targeting Parkinson's disease.
    • Further studies will focus on the functional implications of the observed structural features.