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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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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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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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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Lipid diversity in clostridia.

Ziqiang Guan1, Howard Goldfine2

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, United States of America.

Biochimica Et Biophysica Acta. Molecular and Cell Biology of Lipids
|May 11, 2021
PubMed
Summary
This summary is machine-generated.

Clostridia species exhibit diverse lipid profiles, with unique polar lipids characterizing distinct clades. These specialized lipids, like glycerol acetals and aminoacyl-phosphatidylglycerol, offer protection against environmental stresses and host immunity.

Keywords:
ClostridiumGlycosyldiradylglycerols phospholipidsPlasmalogensTaxonomy

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Area of Science:

  • Microbiology
  • Lipidomics
  • Biochemistry

Background:

  • Clostridia are a diverse group of bacteria with significant roles in health and disease.
  • Understanding their lipid composition is crucial for elucidating their survival mechanisms and pathogenicity.

Purpose of the Study:

  • To review the current knowledge on the lipidomes of various Clostridia species.
  • To highlight the diversity and specialization of polar lipids within different clostridial clades.

Main Methods:

  • Lipidomic analysis of twenty-one Clostridia species.
  • Comparative analysis of polar lipid profiles across different clades.
  • Identification of characteristic and specialized lipids.

Main Results:

  • Significant diversity in lipidomes was observed among Clostridia species.
  • All Clostridium sensu stricto species contain phosphatidylethanolamine, phosphatidylglycerol, and cardiolipin.
  • Specialized polar lipids, such as glycerol acetals and aminoacyl-phosphatidylglycerol, were identified in specific clades, conferring unique protective functions.

Conclusions:

  • Clostridial lipid diversity reflects adaptation to various environments and challenges.
  • Specialized lipids play key roles in protecting clostridial membranes from solvents, unsaturated conditions, and host immune responses.
  • This lipid diversity is conserved across related species, including Clostridium botulinum.