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Related Concept Videos

Proteins: Dietary Sources and Requirements01:28

Proteins: Dietary Sources and Requirements

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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
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Protein Folding Quality Check in the RER01:29

Protein Folding Quality Check in the RER

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
1.4K
Protein and Protein Structure02:15

Protein and Protein Structure

79.8K
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.
A protein's shape is critical to its function. For example, an enzyme...
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Protein Absorption01:12

Protein Absorption

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Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
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Related Experiment Video

Updated: Jul 27, 2025

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

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Perspective: Developing a Nutrient-Based Framework for Protein Quality.

Shavawn M Forester1, Emily M Jennings-Dobbs1, Shazia A Sathar2

  • 1Nutrient Institute LLC, Reno, NV, United States.

The Journal of Nutrition
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

The new Essential Amino Acid 9 (EAA-9) score offers a personalized approach to protein quality, moving beyond the limitations of the Protein Digestibility-Corrected Amino Acid Score (PDCAAS). This nutrient-based framework supports precision nutrition by evaluating amino acids individually.

Keywords:
DIAASPDCAASamino acidsdietary recommendationsleucinelysineprecision nutritionprotein quality

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Public Health

Background:

  • Current protein quality assessment, using the Protein Digestibility-Corrected Amino Acid Score (PDCAAS), relies on a generalized measure of protein quality.
  • The PDCAAS is based on the limiting amino acid and a bioavailability factor, presenting limitations in scalability, transparency, and additivity.
  • A paradigm shift towards treating amino acids as individual, metabolically active nutrients is crucial for advancing precision nutrition.

Purpose of the Study:

  • To introduce and validate the Essential Amino Acid 9 (EAA-9) score, a novel nutrient-based protein quality scoring framework.
  • To address the limitations of the PDCAAS by developing a more scalable, transparent, and additive scoring system.
  • To enable personalized dietary recommendations for essential amino acids based on individual needs.

Main Methods:

  • Development of the Essential Amino Acid 9 (EAA-9) scoring framework.
  • Validation of the EAA-9 score through comparisons with the PDCAAS.
  • Demonstration of practical applications of the EAA-9 framework in precision nutrition.

Main Results:

  • The EAA-9 score was developed as an innovative, nutrient-based protein quality scoring framework.
  • Comparisons confirmed the validity of the EAA-9 score against the established PDCAAS.
  • Practical applications highlighted the EAA-9 framework's utility for precision nutrition.

Conclusions:

  • The EAA-9 scoring framework represents a significant advancement in protein quality evaluation, moving towards a precision nutrition approach.
  • This framework allows for personalized essential amino acid recommendations, considering factors like age and metabolic conditions.
  • The EAA-9 score is a powerful tool for ensuring adequate dietary intake of essential amino acids, enhancing public health strategies.