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Related Experiment Video

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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Compound-gene interaction mapping reveals distinct roles for Staphylococcus aureus teichoic acids.

John P Santa Maria1, Ama Sadaka2, Samir H Moussa1

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02139;

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2014
PubMed
Summary

Staphylococcus aureus requires either lipoteichoic acid (LTA) or wall teichoic acid (WTA) for cell division. Depleting WTA makes D-alanine-tailored LTAs essential for survival, revealing distinct networks for these cell envelope polymers.

Keywords:
Tn-seqTraDISsynthetic lethality

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Staphylococcus aureus possesses two main teichoic acid (TA) polymers: lipoteichoic acid (LTA) and wall teichoic acid (WTA).
  • These TAs are thought to have overlapping functions in regulating bacterial cell division.
  • Understanding their distinct roles is crucial for novel therapeutic strategies.

Purpose of the Study:

  • To investigate the specific roles of LTA and WTA in Staphylococcus aureus cell division.
  • To identify cellular factors essential for survival upon WTA depletion.
  • To elucidate the interaction networks involving TAs and other cell envelope components.

Main Methods:

  • Utilized a small molecule inhibitor to screen a transposon library for essential genes when WTA is absent.
  • Constructed an interaction network linking WTA with genes in LTA synthesis, peptidoglycan synthesis, and D-alanine modification.
  • Analyzed terminal phenotypes of cells lacking both LTA and WTA.

Main Results:

  • Identified distinct synthetic interactions between LTA, WTA, and other cell envelope pathways.
  • Demonstrated that D-alanylation of LTA is essential for survival when WTA is depleted.
  • Observed that cells lacking both LTA and WTA cannot form Z rings and fail to divide.

Conclusions:

  • Either LTA or WTA is necessary for initiating Staphylococcus aureus cell division.
  • These polymers function within separate cellular networks to regulate cell division.
  • D-alanine-tailored LTAs are critical for survival in the absence of WTAs.