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Molecular ruler of the attachment organelle in Mycoplasma pneumoniae

Daisuke Nakane1, Kohki Murata2, Tsuyoshi Kenri3

  • 1Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo, Japan.

Plos Pathogens
|June 10, 2021
PubMed

Insights

Researchers found that the HMW2 protein acts as a molecular ruler to control the size of the attachment organelle in Mycoplasma pneumoniae bacteria. This finding offers insights into bacterial cell organization and parasitic lifestyles.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Cell Biology

Background:

  • Bacteria require precise control over macromolecular structures for survival.
  • Mycoplasma pneumoniae, a pathogen, possesses a polar attachment organelle essential for its functions.
  • The size regulation mechanism of this organelle is not well understood.

Purpose of the Study:

  • To investigate the role of HMW2 protein in determining the size of the Mycoplasma pneumoniae attachment organelle.
  • To elucidate the design principle behind the constant size of the attachment organelle.

Main Methods:

  • Genetic engineering of Mycoplasma pneumoniae to create mutants with altered HMW2 coiled-coil regions.
  • Quantification of attachment organelle length using transmission electron microscopy and fluorescent microscopy with nanometer precision.

Main Results:

  • Engineered HMW2 mutants resulted in both elongated and shortened attachment organelles.
  • Demonstrated that HMW2 functions as a molecular ruler to dictate organelle length.
  • Precisely quantified size variations with nanometer accuracy.

Conclusions:

  • HMW2 protein's coiled-coil regions directly control the length of the attachment organelle.
  • This molecular ruler mechanism provides insight into bacterial cellular organization.
  • Understanding this mechanism is crucial for comprehending the parasitic lifestyle of Mycoplasma pneumoniae.

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