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Protein Folding01:25

Protein Folding

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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.
Protein Structure Is Critical to Its Biological Function
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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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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 domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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A general approach to protein folding using thermostable exoshells.

Samira Sadeghi1,2, Siddharth Deshpande1, Girish Vallerinteavide Mavelli1

  • 1Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.

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Nanoscale exoshells (tES) improve in vitro protein folding by providing nanoenvironments. This method significantly enhances protein yield, activity, and solubility for diverse protein types.

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Protein Science

Background:

  • In vitro protein folding is challenging, often leading to aggregation, low yields, and reduced specific activity.
  • Existing methods struggle with diverse protein types, including those with complex structures or multiple subunits.

Purpose of the Study:

  • To investigate the use of nanoscale exoshells (tES) as complementary nanoenvironments for in vitro protein folding.
  • To assess the impact of tES on the yield, activity, and solubility of a diverse range of protein substrates.

Main Methods:

  • Encapsulation of 12 diverse protein substrates within tES.
  • Evaluation of protein folding, yield, and specific activity after release from tES.
  • Analysis of factors influencing functional folding, such as charge complementation.

Main Results:

  • Protein encapsulation within tES increased soluble yield (3-fold to >100-fold), functional yield (2-fold to >100-fold), and specific activity (3-fold to >100-fold) for all tested proteins.
  • Average soluble yield was 6.5 mg/100 mg of tES.
  • Charge complementation between tES internal cavity and protein substrate was identified as the primary determinant of functional folding.

Conclusions:

  • Nanoscale exoshells provide an effective solution for improving in vitro protein folding.
  • Electrostatic interactions at the nanoscale play a crucial role in successful protein folding within tES.
  • This technology offers a significant advancement for producing functional proteins in vitro.