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Sequence analysis of porothramycin biosynthetic gene cluster.

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The porothramycin biosynthetic gene cluster was identified in Streptomyces albus, revealing unique enzymes for synthesizing this DNA-alkylating compound. Unexpected gene differences suggest alternative pathways for precursor modification.

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Area of Science:

  • Microbial natural product biosynthesis
  • Synthetic biology
  • Genomics and molecular biology

Background:

  • Porothramycin is a sequence-selective DNA alkylating compound.
  • Its structural similarity to pyrrolobenzodiazepines (PBDs) suggests related biosynthetic pathways.
  • Understanding the genetic basis of porothramycin production is crucial for novel drug discovery.

Purpose of the Study:

  • To identify and characterize the biosynthetic gene cluster for porothramycin in Streptomyces albus.
  • To compare the porothramycin gene cluster with that of the related PBD compound, anthramycin.
  • To elucidate the specific enzymatic steps and precursor modifications involved in porothramycin biosynthesis.

Main Methods:

  • Genome sequencing and analysis of Streptomyces albus (ATCC 39897).
  • Identification and characterization of a 39.7 kb DNA region containing 27 putative genes.
  • Bioinformatic comparison with the anthramycin biosynthetic gene cluster.
  • Sequence analysis of Non-Ribosomal Peptide Synthetase (NRPS) modules.
  • Ultra-high-performance liquid chromatography-diode array detection-mass spectrometry (UHPLC-DAD-MS) for product analysis.

Main Results:

  • The 39.7 kb porothramycin biosynthetic gene cluster was identified, comprising 27 putative genes.
  • Eighteen genes showed high similarity to those in the anthramycin gene cluster, but significant differences were observed.
  • Two specific methyltransferase genes (por26, por25) and a homologous methyltransferase gene (por18) were identified.
  • Sequence analysis suggests early methylation of the anthranilate unit and late modification of the PBD core.
  • UHPLC-DAD-MS analysis confirmed the presence of porothramycin and indicated missing biosynthetic steps for certain modifications.

Conclusions:

  • The porothramycin biosynthetic gene cluster contains unique genes, indicating alternative enzymatic pathways compared to anthramycin.
  • Specific methyltransferases (Por26, Por25) are likely involved in key methylation steps.
  • The study provides insights into the biosynthesis of DNA-alkylating PBDs and identifies potential targets for metabolic engineering.