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Protein Organization01:24

Protein Organization

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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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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Identification of Functional Protein Regions Through Chimeric Protein Construction
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Rice proteins and cod proteins forming shared microstructures with enhanced functional and nutritional properties.

Ren Wang1, Tingting Wang1, Wei Feng1

  • 1Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China; Jiangsu Provincial Research Centre for Bioactive Product Processing Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.

Food Chemistry
|March 19, 2021
PubMed
Summary

Researchers developed water-soluble protein co-assemblies from rice proteins (RPs) and cod proteins (CPs). This novel method significantly enhances protein solubility and customizes nutritional profiles for broader applications.

Keywords:
Cod proteinsHydrophobic proteinsProtein co-assembliesRice proteinsWater solubility

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Area of Science:

  • Food Science
  • Biochemistry
  • Materials Science

Background:

  • Low water solubility of plant and animal proteins, like rice proteins (RPs) and cod proteins (CPs), limits their industrial applications.
  • Developing methods to improve protein solubility is crucial for expanding their use in food and other industries.

Purpose of the Study:

  • To create highly water-soluble protein co-assemblies from RPs and CPs.
  • To investigate the structural and functional properties of these novel co-assemblies.
  • To explore the potential for customizing protein characteristics through co-assembly.

Main Methods:

  • Hydrating RPs and CPs at pH 12 followed by neutralization to form nanoscale colloidal co-assemblies (80–150 nm).
  • Assessing the water solubility of the resulting protein co-assemblies.
  • Conducting structural analysis to understand the protein interactions and assembly formation.

Main Results:

  • Achieved over 90% (w/v) solubility for RPs and significant solubility for CP subunits.
  • Co-assemblies formed a core-shell structure with RPs at the core and CPs as the outer layer.
  • Exposed hydrophilic motifs and buried hydrophobic moieties enhanced water-dispersibility.
  • Co-assembled proteins exhibited a leveraged amino acid composition.

Conclusions:

  • Successfully developed a method to produce highly water-soluble protein co-assemblies from RPs and CPs.
  • The co-assembly process enhances protein solubility and modifies structural and nutritional properties.
  • This technology offers potential for customized protein ingredients in various applications.