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Related Experiment Videos

Multiple peptide synthetase gene clusters in Actinomycetes.

M Sosio1, E Bossi, A Bianchi

  • 1Biosearch Italia SpA, Gerenzano, Italy.

Molecular & General Genetics : MGG
|November 21, 2000
PubMed
Summary

Actinomycetes possess numerous peptide synthetase genes, suggesting a significant genomic capacity for non-ribosomal peptide synthesis. Many strains may have the genetic potential to produce more peptides than currently identified.

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Area of Science:

  • Microbiology
  • Genomics
  • Biochemistry

Background:

  • Non-ribosomal peptides (NRPs) are secondary metabolites with diverse biological activities.
  • Peptide synthetases (PSs) are large modular enzymes responsible for NRP biosynthesis.
  • Actinomycetes are known producers of various bioactive NRPs.

Purpose of the Study:

  • To investigate the prevalence and genomic organization of peptide synthetase genes in actinomycetes.
  • To assess the genetic potential for NRP production in different actinomycete strains.

Main Methods:

  • Hybridization of oligonucleotide probes derived from conserved PS motifs with cosmid libraries.
  • Physical mapping and characterization of positive cosmids.
  • Polymerase chain reaction (PCR) amplification and sequencing.

Related Experiment Videos

  • Southern hybridization analysis of genomic DNA from various actinomycete strains.

    • Main Results:

    • Identified at least eight unlinked contigs in Planobispora rosea encoding over 40 putative peptide synthetase modules.
    • Confirmed the presence of peptide synthetase genes in Actinoplanes teichomyceticus.
    • Observed multiple hybridizing bands in most tested actinomycete strains, exceeding expectations based on known products.
    • Detected positive signals even in strains not reported to produce oligopeptides.

    Conclusions:

    • Actinomycetes dedicate a substantial portion of their genomes to non-ribosomal peptide synthesis.
    • Most actinomycete strains possess the genetic machinery for producing a wider range of oligopeptides than currently described.
    • The study highlights the untapped potential of actinomycetes for novel peptide discovery.