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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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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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The Methylerythritol Phosphate Pathway to Isoprenoids.

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The methylerythritol phosphate (MEP) pathway is crucial for isoprenoid biosynthesis in many pathogens. This review details the MEP pathway

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Area of Science:

  • Biochemistry
  • Natural Product Chemistry
  • Enzymology

Background:

  • Isoprenoids are a diverse class of natural products vital for cellular processes and biotechnology.
  • Isoprenoid biosynthesis was traditionally attributed to the mevalonate pathway.
  • The methylerythritol phosphate (MEP) pathway, discovered in the 1990s, provides an alternative route.

Purpose of the Study:

  • To review the seven enzymes of the MEP pathway.
  • To discuss their discovery, structures, and catalytic mechanisms.
  • To highlight the MEP pathway's potential as a drug target.

Main Methods:

  • Literature review of the MEP pathway enzymes.
  • Analysis of enzyme structures and catalytic mechanisms.
  • Overview of species distribution and drug target potential.

Main Results:

  • Detailed description of the seven MEP pathway enzymes.
  • Examples of unique catalytic mechanisms, including cytidilation and iron-sulfur cluster use.
  • Isoprenoid biosynthesis exhibits distinct species-specific patterns.

Conclusions:

  • The MEP pathway is essential for many bacterial and apicomplexan pathogens.
  • Its absence in humans makes it a promising selective drug target.
  • Understanding MEP pathway enzymes is key to developing new therapeutics.