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Dual phenazine gene clusters enable diversification during biosynthesis.

Yi-Ming Shi1, Alexander O Brachmann1,2, Margaretha A Westphalen1

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This study reveals how bacteria modify phenazine compounds using two biosynthetic gene clusters (BGCs). These modifications create diverse, broad-spectrum antibiotics, potentially aiding the bacteria-nematode symbiosis.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Chemical Biology

Background:

  • Biosynthetic gene clusters (BGCs) drive chemical diversity in microbes through evolution.
  • Phenazine BGCs are common in bacteria, with core biosynthesis understood, but modification pathways remain largely unknown.

Purpose of the Study:

  • To investigate the diversity-oriented modifications of the phenazine core in Xenorhabdus szentirmaii.
  • To identify novel intermediates and enzymatic machinery involved in phenazine derivatization.

Main Methods:

  • Analysis of two distinct BGCs in Xenorhabdus szentirmaii.
  • Identification of a common aldehyde intermediate.
  • Evaluation of antibiotic activities of derived phenazine compounds.

Main Results:

  • Two distinct BGCs in Xenorhabdus szentirmaii mediate diverse phenazine modifications.
  • A novel aldehyde intermediate serves as a common branch point for multiple modification pathways.
  • Phenazine derivatives exhibit broad-spectrum antibiotic activity, converting Gram-positive specific compounds.

Conclusions:

  • Xenorhabdus szentirmaii employs sophisticated phenazine modification strategies for chemical diversity.
  • These modifications enhance antibiotic capabilities, potentially supporting the nematode symbiosis.
  • The findings offer insights into bacterial adaptation and niche maintenance through chemical warfare.