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Related Concept Videos

The Proteasome02:18

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
The Proteasome02:18

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
The Proteasome01:13

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Published on: December 18, 2013

Proteolytic processing and regulation.

H Neurath1

  • 1Department of Biochemistry, University of Washington, Seattle.

Enzyme
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

Many proteins are synthesized as inactive precursors, requiring post-translational processing by proteolytic enzymes. Discoveries in molecular biology have significantly advanced understanding of these crucial enzymes and their roles in protein maturation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Proteins like hormones and neuropeptides are synthesized as inactive precursors.
  • Post-translational processing by proteolytic enzymes is essential for protein maturation.
  • Early studies on zymogen activation laid the groundwork for current knowledge.

Purpose of the Study:

  • To review the historical development and current understanding of proteolytic enzymes in protein processing.
  • To highlight key discoveries in prohormone processing.
  • To discuss the impact of molecular biology on studying these proteases.

Main Methods:

  • Review of historical scientific literature.
  • Characterization of mammalian processing prohormone enzymes.
  • Application of molecular biology techniques.

Main Results:

  • Identification of mammalian processing prohormone enzymes as members of the yeast kexin family.
  • Discovery of key precursors like pre-pro-opiomelanocortin and proinsulin.
  • Significant advancement in understanding the nature and function of these proteases.

Conclusions:

  • Proteolytic enzymes play a critical role in converting inactive protein precursors into functional molecules.
  • The study of these enzymes has evolved significantly, from early zymogen observations to modern molecular biology approaches.
  • Continued research using advanced methods promises further insights into protein processing pathways.