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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.
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Protein Absorption01:12

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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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The Central Dogma01:20

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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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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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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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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Where Do You Get Your Protein? Or: Biochemical Realization.

Tuomas E Tahko

    The British Journal for the Philosophy of Science
    |August 18, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Biochemical kinds, like proteins, present challenges for scientific philosophy regarding their reduction to chemistry. This study argues that multiple realization does not preclude ontological reductionism for biochemical kinds.

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    Area of Science:

    • Philosophy of Science
    • Biochemistry
    • Chemistry

    Background:

    • Biochemical kinds, such as proteins, can be studied from both biological and chemical perspectives.
    • The relationship between biological functions and microstructures is a key question in understanding biochemical kinds.
    • This leads to discussions on ontological reductionism, microstructuralism, and multiple realization at the biology-chemistry interface.

    Purpose of the Study:

    • To examine whether biochemical kinds challenge ontological reductionism.
    • To explore the implications of multiple realization for natural kinds.
    • To determine the prospects for ontological reductionism regarding biochemical kinds.

    Main Methods:

    • Philosophical analysis of ontological reductionism and microstructuralism.
    • Examination of multiple realization at the biology-chemistry interface.
    • Case study involving haemoglobin and its functions.

    Main Results:

    • Biochemical kinds initially appear to challenge ontological reductionism due to multiple realization.
    • The challenge posed by multiple realization can be addressed through specific strategies.
    • There are reasonable prospects for ontological reductionism about biochemical kinds.

    Conclusions:

    • Ontological reductionism regarding biochemical kinds is plausible.
    • The findings support natural kind monism over pluralism.
    • The study reconciles biological functions with chemical microstructures within a reductionist framework.