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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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Protein Folding01:25

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Molecular Chaperones and Protein Folding03:00

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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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Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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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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Protein Dynamics in Living Cells01:19

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Exploring force-driven stochastic folding dynamics in mechano-responsive proteins and implications in phenotypic

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Single-point mutations in cadherin-23 affect protein function and aging. Mechanical forces reveal how intra-domain interactions influence protein stability and folding dynamics, linking genotype to phenotype.

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Area of Science:

  • Molecular Zoology
  • Biophysics
  • Protein Dynamics

Background:

  • Single-point mutations are crucial for molecular zoology, impacting protein function, genetic diversity, and evolution.
  • Cadherin-23, a mechano-responsive protein, plays a role in maintaining structural integrity, with genetic variants exhibiting distinct genotypes and phenotypes.

Purpose of the Study:

  • To investigate the impact of single-point mutations on cadherin-23's structural integrity and functional decline with aging.
  • To analyze the distinct genotypes and phenotypes of three cadherin-23 variants.
  • To decipher the molecular mechanisms of force adaptation and the genotype-phenotype mechanical relationship.

Main Methods:

  • Studied three genetic variants of cadherin-23 with distinct genotypes and phenotypes.
  • Exposed protein variants to constant and oscillatory forces using magnetic tweezers.
  • Measured variations in stochastic folding dynamics and protein microstates under force.

Main Results:

  • All variants displayed multiple microstates under force.
  • The variant with more intra-domain interactions showed transitions across heterogeneous microstates over larger force ranges and longer durations.
  • Weaker inter-strand correlations correlated with greater unfolding cooperativity, faster intrinsic folding, and a more tension-sensitive folding-energy landscape.

Conclusions:

  • Protein variants exhibit varying force adaptations due to differences in intra-domain interactions and inter-strand correlations.
  • A mechanical link between genotype and phenotype is proposed, explaining variations in protein function and aging.
  • Understanding these molecular mechanisms is key to comprehending protein evolution and disease.