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Regulated Protein Degradation02:58

Regulated Protein Degradation

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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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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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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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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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Related Experiment Video

Updated: Mar 3, 2026

In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination
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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination

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Selective adaptor dependent protein degradation in bacteria.

Nathan J Kuhlmann1, Peter Chien2

  • 1Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, United States.

Current Opinion in Microbiology
|May 2, 2017
PubMed
Summary
This summary is machine-generated.

Adaptor proteins regulate bacterial AAA+ proteases, controlling protein degradation essential for cell functions. Understanding these adaptors is key to managing protein destruction and cellular processes.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Energy-dependent proteolysis is vital for cellular life, but dysregulation causes severe consequences.
  • Oligomeric AAA+ proteases in bacteria control protein destruction, with adaptor proteins playing a key regulatory role.
  • Adaptors influence substrate specificity and protease activity through various mechanisms, including scaffolding and hierarchical assembly.

Purpose of the Study:

  • To review recent advancements in regulated protein degradation.
  • To elucidate the fundamental principles of adaptor protein function in proteolysis.
  • To highlight the critical biological roles of adaptors in processes like cell cycle progression and quality control.

Main Methods:

  • This review synthesizes current research on bacterial AAA+ proteases and their adaptors.
  • It focuses on the mechanisms by which adaptors modulate substrate recognition and protease activity.
  • The review examines how adaptor assembly influences protease selectivity and function.

Main Results:

  • Adaptor proteins are crucial for precise control over substrate selection by AAA+ proteases.
  • Adaptors can dictate protease activity, assembly, and substrate tethering, thereby fine-tuning degradation.
  • Hierarchical assembly of adaptors allows for sophisticated regulation of protease selectivity.

Conclusions:

  • Regulated protein degradation, mediated by adaptors, is fundamental to cellular signaling and homeostasis.
  • Adaptor proteins are essential for critical cellular functions, including cell cycle progression and protein quality control.
  • Further understanding of adaptors offers insights into controlling protein destruction pathways.