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Related Concept Videos

Mechanical Protein Functions01:58

Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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Protein Denaturation01:28

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The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
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Proteins: From Genes to Degradation02:11

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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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Amyloid Fibrils03:03

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Mechanical Deformation Accelerates Protein Ageing.

Jessica Valle-Orero1, Jaime Andrés Rivas-Pardo1, Rafael Tapia-Rojo1

  • 1Department of Biological Sciences, Columbia University, New York, NY, 10027, USA.

Angewandte Chemie (International Ed. in English)
|May 5, 2017
PubMed
Summary
This summary is machine-generated.

Tissue aging involves protein damage. Mechanical unfolding rapidly accelerates protein aging, making them lose integrity, while antioxidants can slow this process.

Keywords:
force spectroscopyoxidative damageprotein foldingprotein structuresingle-molecule studies

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Area of Science:

  • Biochemistry
  • Biophysics
  • Molecular Biology

Background:

  • Tissue aging is characterized by irreversible oxidative protein modification.
  • Understanding the mechanisms of protein aging is crucial for addressing age-related decline.

Purpose of the Study:

  • To investigate the impact of mechanical force on protein aging rates.
  • To explore methods for accelerating or decelerating protein aging.
  • To establish a link between protein unfolding and accelerated aging.

Main Methods:

  • Applying mechanical force to unfold single proteins.
  • Measuring changes in protein integrity and contractility over time.
  • Assessing the effects of antioxidants and oxidants on protein aging.

Main Results:

  • Unfolded proteins aged significantly faster (minutes to days) than folded proteins (weeks).
  • Mechanical unfolding led to irreversible loss of protein contractility and mechanical integrity.
  • Antioxidants like ascorbic acid slowed oxidative damage, while oxidants accelerated it.

Conclusions:

  • Mechanical unfolding dramatically accelerates protein aging, mimicking decades of physiological exposure.
  • Protein structural state (unfolded vs. folded) critically influences aging rates.
  • This research offers a novel method to rapidly study and potentially mitigate protein aging.