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Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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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Author Spotlight: Improving Beef Cattle Nutrition and Production with a Focus on Feed Efficiency and Meat Quality Traits Through Advanced Biochemical and Molecular Assays
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Cooking-Induced Protein Modifications in Meat.

Tzer-Yang Yu1,2, James D Morton2,3, Stefan Clerens1,3

  • 1Food & Bio-Based Products, AgResearch Lincoln Research Centre, Private Bag 4749, Christchurch, 8140, New Zealand.

Comprehensive Reviews in Food Science and Food Safety
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Summary

Heating meat causes molecular changes in proteins, including carbonylation and Maillard reactions. Understanding these heat-induced protein modifications is key to controlling meat

Keywords:
cookingheatingmeatprotein aggregationprotein modifications

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Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication
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Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication
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Area of Science:

  • Food Science
  • Protein Chemistry
  • Analytical Chemistry

Background:

  • Meat consumption frequently involves heat treatment (e.g., boiling, roasting).
  • Thermal processing induces significant structural and molecular alterations in meat proteins.
  • Understanding these changes is crucial for controlling nutritional and functional properties.

Purpose of the Study:

  • To review and summarize molecular-level protein modifications in cooked mammalian meat.
  • To provide insights into heat-induced amino acid residue alterations.

Main Methods:

  • Literature review of protein modifications in cooked meat.
  • Discussion of case studies from related biological materials (milk, wool).

Main Results:

  • Heating causes protein denaturation and aggregation at the 3D structural level.
  • Molecular alterations include protein carbonylation, aromatic residue modification, and Maillard product formation.
  • These modifications impact the primary structure (amino acid residues) of meat proteins.

Conclusions:

  • Characterizing molecular protein modifications is essential for understanding meat's thermal processing.
  • This knowledge aids in better control of meat product quality and nutritional value.
  • Insights from milk and wool provide complementary understanding of heat-induced protein changes.