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Related Concept Videos

Cofactors and Coenzymes01:27

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
Cofactors and Coenzymes01:27

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
Role of Reduced Coenzymes NADH and FADH₂01:29

Role of Reduced Coenzymes NADH and FADH₂

The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
Cofactors and Coenzymes01:24

Cofactors and Coenzymes

Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
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Nucleic Acids and Nucleotides01:20

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
Deoxyribonucleic Acid (DNA)
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Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues
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Published on: November 22, 2014

The "great" controlling nucleotide coenzymes.

Richard L Veech1, Michael Todd King1, Robert Pawlosky1

  • 1Laboratory of Metabolic Control, NIAAA, NIH, Rockville, MD, 20852, USA.

IUBMB Life
|January 10, 2019
PubMed
Summary

This study explores how nucleotide coenzymes regulate energy metabolism. These coenzymes provide energy for biochemical reactions and their potential energy is expressed through enzyme reactions. The study addresses a paradox where energy in coenzyme pools cannot be determined from their concentrations. It finds that energy in coenzyme couples can be altered by supplying energy equivalents like ketones. D-β-hydroxybutyrate is proposed as a means to overcome insulin resistance and restore antioxidant capacity. The findings suggest potential treatments for Alzheimer's and Parkinson's diseases, as well as enhancing life span and physiological performance.

Keywords:
ATPParkinson's diseaseacetylCoAfree NADHfree NADPHnucleotide coenzymeβ hydroxybutyrateNucleotide coenzymesEnergy metabolismMetabolic regulationKetones in therapy

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Area of Science:

  • Metabolic biochemistry
  • Nucleotide coenzyme dynamics
  • Energy metabolism regulation

Background:

Understanding energy metabolism requires examining nucleotide coenzymes, which are central to metabolic pathways. These coenzymes provide energy to drive biochemical reactions. Their potential energy is often overlooked due to a concentration paradox. The energy in coenzyme couples cannot be directly measured from their concentrations. Instead, their potential energy is expressed through enzyme reactions. This energy is crucial for regulating metabolic processes. The coenzyme couples include [NAD+]/[NADH], [NADP+]/[NADPH], [acetyl CoA]/[CoA], and [ATP]/[ADP]x[Pi]. These couples influence energy metabolism in mitochondria and cytoplasm.

Purpose Of The Study:

This study aims to explore the role of nucleotide coenzymes in energy metabolism. It focuses on how these coenzymes regulate metabolic pathways through their shared potential energy. The study addresses a gap in understanding how energy in coenzyme pools is expressed. It examines the paradox of energy determination from coenzyme concentrations. The purpose is to clarify how energy in these couples affects metabolic regulation. The study also investigates the impact of energy equivalents like ketones. It seeks to uncover how these coenzymes can be manipulated for therapeutic purposes. The goal is to provide insights into energy metabolism regulation.

Main Methods:

The study employs a review approach to analyze existing literature on nucleotide coenzymes. It synthesizes evidence from various metabolic pathways. The focus is on the coenzyme couples [NAD+]/[NADH], [NADP+]/[NADPH], [acetyl CoA]/[CoA], and [ATP]/[ADP]x[Pi]. The review examines how these couples regulate energy metabolism. It investigates the paradox of energy determination from coenzyme concentrations. The study uses biochemical data to explore energy expression in enzyme reactions. It also evaluates the role of ketones in altering coenzyme energy. The approach combines theoretical analysis with empirical findings.

Main Results:

The key findings from the literature suggest that nucleotide coenzymes regulate energy metabolism through their potential energy. The energy in coenzyme couples is expressed in enzyme reactions. The study highlights the paradox of energy determination from coenzyme concentrations. It shows that the energy in these couples can be altered by supplying energy equivalents like ketones. D-β-hydroxybutyrate is proposed as a means to overcome insulin resistance. The findings suggest that ketones can restore antioxidant capacity. They also indicate potential treatments for Alzheimer's and Parkinson's diseases. The results propose that ketones may enhance life span and physiological performance.

Conclusions:

The synthesis and implications of the literature suggest that nucleotide coenzymes play a regulatory role in energy metabolism. The study proposes that energy in coenzyme couples is expressed through enzyme reactions. It suggests that ketones can alter the energy in these couples. The findings imply that D-β-hydroxybutyrate may overcome insulin resistance. They also suggest that ketones may restore antioxidant capacity. The study indicates potential treatments for neurodegenerative diseases. It proposes that ketones may enhance life span and physiological performance. The conclusions are based on the synthesized evidence from the literature.

The energy in coenzyme couples is expressed through enzyme reactions, influencing metabolic pathways.

Ketones may alter the energy in coenzyme couples, potentially overcoming insulin resistance.

The energy in coenzyme couples is expressed through reactions, not directly from their concentrations.

[NAD+]/[NADH] couples regulate energy metabolism by influencing enzyme reactions.

Ketones may enhance physiological performance by altering coenzyme energy.

The study suggests that ketones may offer potential treatments for Alzheimer's and Parkinson's diseases.