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Updated: May 15, 2025

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Application of a replicative targetable vector system for difficult-to-manipulate streptomycetes.

Juan Pablo Gomez-Escribano1, Alina Zimmermann1,2, Shu-Ning Xia2,3

  • 1Department Bioresources for Bioeconomy and Health Research, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124, Braunschweig, Germany.

Applied Microbiology and Biotechnology
|April 10, 2025
PubMed
Summary

A new conjugative replicative vector, pDS0007, facilitates genetic manipulation in challenging bacteria like Streptomyces iranensis. This vector enables gene deletion and aids in discovering new biosynthetic pathways.

Keywords:
StreptomycesGenetic manipulationGenetic toolsHomologous recombinationKnock-out

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Synthetic Biology

Background:

  • Genetic manipulation of bacteria like Streptomyces iranensis is hindered by low homologous recombination and inefficient DNA introduction.
  • Previous methods, including suicidal vectors, failed for constructing mutants in S. iranensis due to poor conjugation efficiency.

Purpose of the Study:

  • To develop and apply a novel conjugative replicative vector, pDS0007, for efficient gene targeting in difficult-to-manipulate bacterial strains.
  • To demonstrate the vector's utility in gene deletion and the discovery of novel biosynthetic pathways.

Main Methods:

  • Construction and application of the pDS0007 vector, featuring a self-replicative and easily curable system.
  • Inclusion of I-SceI recognition sites for forced vector loss and homologous recombination.
  • Utilized a Streptomyces codon-optimized gusA gene for visual screening of vector-free clones.

Main Results:

  • pDS0007 demonstrated successful exconjugant selection even with poor conjugation efficiency in S. iranensis.
  • The vector facilitated homologous recombination, enabling single and double crossovers for gene manipulation.
  • Successfully deleted an essential gene in a novel phosphonate biosynthetic pathway, confirmed by 31P NMR spectroscopy.

Conclusions:

  • The pDS0007 vector is a valuable tool for gene targeting in challenging Streptomyces species.
  • This vector system simplifies screening and enables efficient genetic modification.
  • The study successfully elucidated a novel phosphonate biosynthetic pathway using the developed vector.