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Amino Acid Catabolism01:18

Amino Acid Catabolism

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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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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Inorganic Nitrogen Assimilation01:22

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Microbial Nutrition01:28

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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
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Amino Acids in Microbial Metabolism and Function.

Zhaolai Dai1, Zhenlong Wu2, Weiyun Zhu3

  • 1State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China. daizhaolai@cau.edu.cn.

Advances in Experimental Medicine and Biology
|November 22, 2021
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Summary
This summary is machine-generated.

Amino acids (AAs) are crucial for microbial metabolism and survival in the gut, impacting host health. Understanding functional amino acids aids in improving nutrition and host-microbe interactions.

Keywords:
Amino acidsBacteriaFunctionIntestineMetabolism

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Area of Science:

  • Microbiology
  • Nutritional Science
  • Host-Microbe Interactions

Background:

  • Amino acids (AAs) are vital for microbial protein synthesis, metabolism, survival, and virulence.
  • Gut microbial AA metabolism significantly influences host nutrition and physiology.
  • Bile acid conjugation/deconjugation exemplifies bacterial adaptation and inter-kingdom communication involving AAs.

Purpose of the Study:

  • To highlight the critical roles of diverse amino acids (AAs) in digestive tract microbes.
  • To emphasize the impact of AA metabolism on host nutrition, physiology, and anti-virulence strategies.
  • To introduce the concept of functional amino acids for guiding research and applications.

Main Methods:

  • Review of existing literature on microbial amino acid metabolism in the digestive tract.
  • Analysis of the interplay between bacterial adaptation, bile acid metabolism, and amino acid pools.
  • Exploration of the implications for host-microbe interactions and nutritional strategies.

Main Results:

  • Amino acids (AAs) exhibit distinct functions influencing microbial growth, survival, and virulence in the gut.
  • Bacterial modification of bile acids demonstrates complex AA-mediated signaling and adaptation.
  • Modulating gut AA homeostasis presents a challenge and opportunity for improving host health.

Conclusions:

  • The diverse metabolic pathways and functions of amino acids (AAs) in the gut microbiome necessitate consideration in nutritional recommendations.
  • The concept of functional amino acids provides a framework for microbiological, nutritional, and physiological research.
  • Advancements in understanding AA metabolism will enhance host-microbe interactions and improve animal and human health.