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Determination of Molecular Structures of HIV Envelope Glycoproteins using Cryo-Electron Tomography and Automated Sub-tomogram Averaging
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Unraveling the Structure of the Mycobacterial Envelope

Mamadou Daffé1, Hedia Marrakchi1

  • 1Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, Department of Tuberculosis and Infection Biology, Toulouse, France.

Microbiology Spectrum
|July 4, 2019
PubMed

Insights

Mycobacteria possess a unique cell envelope with a plasma membrane, a complex cell wall containing peptidoglycan and arabinogalactan, and an outer mycomembrane. This structure, including mycolic acids, is crucial for the survival of pathogenic species like Mycobacterium tuberculosis.

Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • The mycobacterial cell envelope is a complex, multi-layered structure essential for bacterial survival.
  • Pathogenic mycobacteria, including Mycobacterium tuberculosis, possess a unique outer capsule and mycomembrane.
  • Understanding the cell envelope's structure is critical for developing new antimicrobial strategies.

Purpose of the Study:

  • To provide a comprehensive overview of the mycobacterial cell envelope structure.
  • To highlight the unique components and organization of the mycobacterial cell envelope.
  • To discuss the biological significance of this unique cellular compartment.

Main Methods:

  • Literature review and synthesis of existing research on mycobacterial cell envelope.
  • Analysis of structural data and biochemical composition.
  • Comparative analysis of cell envelope structures across different mycobacterial species.

Main Results:

  • The mycobacterial cell envelope comprises a plasma membrane, a cell wall (peptidoglycan-arabinogalactan), and an outer mycomembrane.
  • The mycomembrane is characterized by very-long-chain fatty acids (mycolic acids) forming its inner leaflet.
  • A periplasmic space exists between the plasma membrane and peptidoglycan layer.

Conclusions:

  • The mycobacterial cell envelope is a structurally unique and biologically important compartment.
  • The mycomembrane's composition and organization, particularly the role of mycolic acids, are key features.
  • Further research into this unique structure may reveal novel therapeutic targets.

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