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Updated: Aug 14, 2026

Measuring Transcellular Interactions through Protein Aggregation in a Heterologous Cell System
04:47

Measuring Transcellular Interactions through Protein Aggregation in a Heterologous Cell System

Published on: May 22, 2020

Role of the Cell Surface of Methanosarcina mazei in Cell Aggregation

R W Robinson1, H C Aldrich, S F Hurst

  • 1Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida 32611.

Applied and Environmental Microbiology
|February 1, 1985
PubMed

Insights

Colonial aggregates of Methanosarcina mazei form due to adhesive extracellular polymers. These polymers contribute to the microorganism

Area of Science:

  • Microbiology
  • Microbial Ecology
  • Biochemistry

Background:

  • Methanosarcina mazei forms multicellular colonies.
  • Colony structure and stability are key to microbial survival and function.

Purpose of the Study:

  • To investigate the ultrastructure of Methanosarcina mazei colonies.
  • To elucidate the composition and role of the extracellular matrix in colony formation and stability.

Main Methods:

  • Scanning electron microscopy (SEM) of colonial aggregates.
  • Transmission electron microscopy (TEM) for ultrastructural analysis.
  • Biochemical analysis of cell envelope polysaccharides.

Main Results:

  • Cells are irregular and form sarcinal colonies, which can disaggregate.
  • A fibrillar matrix outside the plasma membrane mediates cell packing and adherence.
  • The cell envelope contains complex heteropolysaccharides, including N-acetylgalactosamine, galacturonic, and glucuronic acids.
  • Matrix shedding and degradation correlate with colony disaggregation.

Conclusions:

  • Extracellular polymers are crucial for Methanosarcina mazei colony cohesion and adherence.
  • The adhesive nature of these polymers contributes to the organism's hardiness and surface attachment capabilities.
  • Understanding these structures provides insights into methanogen survival strategies.

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