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Related Concept Videos

Overview of Fatty Acid Metabolism01:28

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Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
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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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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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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
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Related Experiment Video

Updated: Sep 13, 2025

Isolation of Lipoprotein Particles from Chicken Egg Yolk for the Study of Bacterial Pathogen Fatty Acid Incorporation into Membrane Phospholipids
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Defining the Enterococcus faecalis Fatty Acid Kinase System of Exogeneous Fatty Acid Utilization.

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Firmicute bacteria utilize unique acyl phosphates for phospholipid synthesis. This study investigates the fatty acid preferences of FakB proteins, revealing their role in acyl chain recycling.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Phospholipid synthesis in Firmicutes involves acyl phosphates, unlike the E. coli pathway.
  • Acyl phosphates are crucial for the initial acylation step catalyzed by PlsY.
  • Two pathways synthesize acyl phosphates: de novo via PlsX and exogenous fatty acid conversion via FakAB.

Purpose of the Study:

  • To characterize the fatty acid preferences of multiple FakB proteins in Firmicutes.
  • To investigate the function of the FakAB pathway in phospholipid synthesis and acyl chain recycling.
  • To analyze the phenotypic consequences of deleting FakB and FakA genes.

Main Methods:

  • Construction and analysis of mutant strains lacking specific FakB proteins or combinations thereof.
  • Phenotypic analysis of strains with deletions in fakA and fakB genes.
  • Investigation of acyl chain recycling mechanisms involving the FakAB pathway.

Main Results:

  • Detailed characterization of fatty acid preferences for various FakB proteins across different Firmicute species.
  • Identification of the functional roles of different FakB paralogs in substrate presentation to FakA.
  • Demonstration of a role for the FakAB pathway in the recycling of acyl chains, particularly in the absence of exogenous fatty acids.

Conclusions:

  • Firmicute phospholipid synthesis relies on a unique acyl phosphate intermediate synthesized via distinct pathways.
  • Multiple FakB proteins exhibit specific fatty acid preferences, contributing to pathway regulation.
  • The FakAB pathway plays a significant role in acyl chain metabolism and recycling within Firmicutes.