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Related Concept Videos

The Proteasome Structure01:17

The Proteasome Structure

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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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The Proteasome02:18

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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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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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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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Assaying Proteasomal Degradation in a Cell-free System in Plants
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Design principles that protect the proteasome from self-destruction.

Amit Kumar Singh Gautam1, Houqing Yu1, Christopher Yellman1

  • 1Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA.

Protein Science : a Publication of the Protein Society
|December 8, 2021
PubMed
Summary

The proteasome, a cellular machine for protein degradation, can be tricked into self-destruction. Specific protein sequences within its own parts, when recognized, trigger this self-degradation, impacting cell viability.

Keywords:
disordered sequenceproteaseproteasomeubiquitin

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The proteasome is a critical cellular machine responsible for degrading proteins.
  • Protein degradation is essential for cellular regulation, quality control, and immune responses.
  • Proteasome assembly and activity are regulated by post-translational modifications on disordered regions of its subunits.

Purpose of the Study:

  • To investigate the role of intrinsically disordered regions (IDRs) in proteasome subunit recognition and degradation.
  • To determine if proteasome IDRs can access substrate recognition sites.
  • To explore the consequences of altering proteasome subunit sequences.

Main Methods:

  • Molecular modeling to predict interactions between disordered regions and proteasome active sites.
  • Biochemical experiments to test the accessibility of substrate recognition sites by disordered regions.
  • Genetic manipulation to replace disordered regions with proteasome-recognized sequences.

Main Results:

  • Disordered regions of proteasomal subunits can access the proteasome's substrate recognition sites.
  • These disordered regions are composed of sequences that typically evade proteasomal recognition.
  • Replacing a disordered region with a proteasome-recognizable sequence induced self-degradation.

Conclusions:

  • Intrinsically disordered regions of proteasome subunits play a role in preventing self-degradation.
  • Alteration of these regions can lead to proteasome self-destruction.
  • This self-degradation can result in cell death, particularly if essential subunits are affected.