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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 Biosynthetic Pathways01:29

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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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Biosynthesis in Bacteria01:24

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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Lipid Catabolism01:25

Lipid Catabolism

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Phase II Reactions: Acetylation Reactions01:24

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Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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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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Alanine metabolism in Bacillus subtilis.

Karzan R Sidiq1, Man W Chow1, Zhao Zhao1

  • 1Centre for Bacterial Cell Biology, Biosciences Institute, Medical Faculty, Newcastle University, Newcastle Upon Tyne, UK.

Molecular Microbiology
|November 6, 2020
PubMed
Summary

Bacillus subtilis utilizes L-alanine for protein synthesis and D-alanine for cell walls. This study identifies key enzymes and AlaP permease, explaining D-alanine assimilation and bacterial growth dynamics.

Keywords:
alaninebacillus subtiliscell wallmetabolismtransporter

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Area of Science:

  • Microbiology
  • Biochemistry
  • Bacterial Physiology

Background:

  • Alanine isomers (D- and L-) are vital for bacterial growth, with L-alanine for protein synthesis and D-alanine for cell wall structure.
  • Genetic studies in Bacillus subtilis have not fully elucidated genes involved in alanine metabolism.

Purpose of the Study:

  • To genetically characterize major enzymes in Bacillus subtilis alanine biosynthesis.
  • To identify and investigate the role of alanine permease (AlaP/YtnA) in D-alanine assimilation.

Main Methods:

  • Genetic characterization of B. subtilis alanine biosynthesis enzymes.
  • Identification and functional analysis of the alanine permease, AlaP (YtnA).

Main Results:

  • Identified AlaP (YtnA) as a key permease for D-alanine assimilation from the environment.
  • Determined that alaT is the primary alanine synthetic gene in B. subtilis, with dat supporting L-alanine auxotroph growth.
  • Showed Dat synthesizes D-alanine, influenced by L-alanine levels, and explained the lack of extracellular D-alanine accumulation.

Conclusions:

  • Alanine metabolism in B. subtilis is primarily controlled by alaT and influenced by Dat, linking D- and L-alanine pools to glutamate levels.
  • The findings couple bacterial protein and cell envelope synthesis with overall metabolic status.
  • Enzymes function unidirectionally in vivo despite potential reversibility in vitro.