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Related Concept Videos

Protein Digestion01:02

Protein Digestion

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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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What is Monogastric Digestion?01:50

What is Monogastric Digestion?

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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.
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Anatomy of the Intestines01:23

Anatomy of the Intestines

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of 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...
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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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Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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Dietary protein source alters gut microbiota composition and function.

J Alfredo Blakeley-Ruiz1, Alexandria Bartlett1,2, Arthur S McMillan3

  • 1Department of Plant and Microbial Biology, College of Agricultural Sciences, North Carolina State University, Raleigh, NC 27695, United States.

The ISME Journal
|March 21, 2025
PubMed
Summary

Dietary protein sources significantly alter gut microbiota composition and function. These changes in gut microbes, driven by diet, may influence host health and life expectancy through altered metabolism.

Keywords:
Mus musculusdietary interventiongut microbiomemetagenomicsmetaproteomicsmice

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Area of Science:

  • Microbiome research
  • Nutritional science
  • Host-microbe interactions

Background:

  • Dietary protein sources impact life expectancy, but mechanisms are unclear.
  • Diet influences gut microbiota, which modulates host health.
  • Interactions between dietary protein and gut microbiota may explain health outcomes.

Purpose of the Study:

  • To investigate the effects of seven dietary protein sources on mouse gut microbiota.
  • To understand how protein source impacts microbial composition and function.
  • To explore the link between dietary protein, gut microbiota metabolism, and host health.

Main Methods:

  • Utilized an integrated metagenomics-metaproteomics approach in mice.
  • Analyzed microbial protein abundances to infer species and functional profiles.
  • Assessed changes in gut microbiota composition and metabolic pathways.

Main Results:

  • Dietary protein source significantly altered gut microbiota species and function.
  • Different protein sources changed microbial enzymes involved in amino acid and glycosylation degradation.
  • Brown rice and egg white protein increased amino acid-degrading enzymes.
  • Egg white protein elevated bacteria and proteins linked to intestinal mucus degradation.

Conclusions:

  • Dietary protein sources modify gut microbiota metabolism.
  • These alterations have implications for gut microbiota-mediated diseases.
  • Understanding these interactions is crucial for dietary recommendations and health outcomes.