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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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Proteins are the building block of life. They are also  the most abundant macromolecules with as many diverse roles in the body. They are part of many structural components that provide unique shapes and structures to animal cells, tissues, and organs. In addition, they also act as biological catalysts and carry out several anabolic and catabolic reactions. Notably, some proteins are chemical messengers and regulate many critical processes, such as metabolism, growth, and development. They...
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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Introduction to Metabolism01:30

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Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
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Regulation of Metabolism01:19

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Microproteins in Metabolism.

Caris A Wadding-Lee1, Catherine A Makarewich1,2

  • 1Division of Molecular Cardiovascular Biology, The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.

Cells
|June 25, 2025
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Summary
This summary is machine-generated.

Microproteins, small proteins encoded by short open reading frames, are key regulators of metabolism. They offer promising new therapeutic targets for noncommunicable diseases (NCDs) like diabetes and cancer.

Keywords:
metabolismmicroproteinmitochondrial functionsmall open reading frame

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Metabolomics

Background:

  • Metabolism is crucial for cellular energy production, and its disruption is linked to noncommunicable diseases (NCDs).
  • Current therapies for NCDs often fail to prevent disease progression, necessitating novel therapeutic targets.
  • Microproteins, small proteins encoded by short open reading frames (sORFs), are emerging as critical metabolic regulators.

Purpose of the Study:

  • To review the roles of microproteins in energy metabolism, mitochondrial function, and nutrient signaling.
  • To discuss the involvement of microproteins in the pathogenesis of NCDs.
  • To explore the potential of microproteins as novel therapeutic targets for metabolic dysfunction.

Main Methods:

  • Literature review of recent advances in genomics and proteomics.
  • Analysis of microprotein functions in metabolic pathways.
  • Discussion of microprotein involvement in NCDs.

Main Results:

  • Microproteins play significant roles in regulating energy metabolism, mitochondrial function, and nutrient signaling pathways.
  • Dysregulation of microproteins is implicated in the development and progression of NCDs.
  • Microproteins encoded by sORFs were previously overlooked but are now recognized as functional proteins.

Conclusions:

  • Microproteins are vital regulators of cellular metabolism and are implicated in NCDs.
  • Microprotein biology presents a new frontier for developing innovative therapeutic strategies.
  • Targeting microproteins may offer a novel approach to combatting the global burden of metabolic diseases.