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Related Concept Videos

Protein Denaturation01:28

Protein Denaturation

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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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Protein Digestion01:02

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Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.
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Hydrolysis01:15

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
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Lipid Digestion01:06

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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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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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The Early Endosome: Endocytosis of Transferrin01:28

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Measuring Lactase Enzymatic Activity in the Teaching Lab
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Lactoferrin: Structure, function, denaturation and digestion.

Bo Wang1, Yakindra Prasad Timilsena1,2, Ewan Blanch1

  • 1a Food Research and Innovation Centre, School of Science , RMIT University , Melbourne , VIC , Australia.

Critical Reviews in Food Science and Nutrition
|September 22, 2017
PubMed
Summary
This summary is machine-generated.

Lactoferrin (LF), a milk protein with health benefits, can lose its structure and function due to heat. This review explores how to preserve LF during processing and digestion for effective use in supplements and formulas.

Keywords:
DenaturationDigestion and ApplicationDryingFunctionLactoferrinStructure

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Area of Science:

  • Biochemistry
  • Food Science
  • Protein Chemistry

Background:

  • Lactoferrin (LF) is a key protein in milk with diverse biological functions, including iron binding, antimicrobial, and anti-inflammatory activities.
  • Its therapeutic and nutritional value is contingent upon maintaining its structural integrity, which is susceptible to denaturation from thermal and physicochemical stresses.
  • LF is widely incorporated into commercial products like infant formula, nutritional supplements, cosmetics, and toothpaste.

Purpose of the Study:

  • To comprehensively review recent literature on lactoferrin's structure-function relationships, denaturation, and gastrointestinal digestion.
  • To evaluate methods for preserving LF's structural integrity during thermal processing and oral delivery.
  • To analyze the implications of these findings for the food and pharmaceutical industries.

Main Methods:

  • Literature review of scientific publications on lactoferrin.
  • Analysis of structure-function relationships and denaturation mechanisms.
  • Comparison of different oral delivery strategies and their effectiveness in preserving LF structure.

Main Results:

  • Lactoferrin's functional properties are directly linked to its higher-order conformation, making it vulnerable to denaturation.
  • Optimization of extraction, powder formation, and product processing is crucial to minimize LF denaturation.
  • Various methods exist to protect LF during thermal processing and oral delivery, with varying degrees of success in maintaining structural integrity.

Conclusions:

  • Preserving the structural integrity of lactoferrin is essential for retaining its beneficial functional properties.
  • Understanding LF's behavior during thermal processing and digestion is key to developing effective delivery systems.
  • This review provides insights for optimizing LF utilization in food and pharmaceutical applications, enhancing product efficacy.