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Microcystin biosynthesis in planktothrix: genes, evolution, and manipulation.

Guntram Christiansen1, Jutta Fastner, Marcel Erhard

  • 1Institut für Biologie (Genetik), Humboldt-Universität Berlin, Germany.

Journal of Bacteriology
|January 4, 2003
PubMed
Summary

Researchers studied microcystin synthetase genes in Planktothrix agardhii, revealing insights into toxin evolution and enabling genetic modification. A novel microcystin variant with reduced phosphatase inhibition was produced.

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Area of Science:

  • Cyanobacterial Toxinology
  • Molecular Evolution
  • Biotechnology

Background:

  • Microcystins are cyclic heptapeptides produced by cyanobacteria, known inhibitors of eukaryotic protein phosphatases 1 and 2A.
  • The genetic basis of microcystin synthesis involves a large gene cluster (mcy) with significant variability across species.
  • Understanding microcystin synthetase gene evolution offers insights into peptide synthetase function and combinatorial biosynthesis.

Purpose of the Study:

  • To sequence and analyze the microcystin synthetase (mcy) gene cluster in the filamentous cyanobacterium Planktothrix agardhii.
  • To investigate the evolutionary relationships of mcy gene clusters and explore horizontal gene transfer.
  • To develop genetic tools for Planktothrix and characterize the function of specific mcy genes.

Main Methods:

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  • Whole-genome sequencing and bioinformatic analysis of the 55.6 kb mcy cluster in Planktothrix agardhii.
  • Comparative analysis of mcy gene content, arrangement, and domain sequences with other cyanobacteria (e.g., Microcystis).
  • Development of a genetic transformation protocol for Planktothrix and targeted gene mutation (mcyJ).

Main Results:

  • The Planktothrix mcy cluster contains genes for peptide synthetases, polyketide synthases, and modifying enzymes, with a unique arrangement compared to Microcystis.
  • Sequence data suggest an evolutionary pathway from ancestral genes towards nodularin biosynthesis, not the reverse, and do not support widespread horizontal gene transfer of complete clusters.
  • Targeted mutation of mcyJ, identified as an O-methyltransferase, resulted in a novel microcystin variant with decreased protein phosphatase inhibitory activity.

Conclusions:

  • The study elucidates the genetic architecture and evolutionary history of microcystin biosynthesis in Planktothrix.
  • Genetic manipulation of Planktothrix provides a new avenue for studying structure-function relationships of microcystins and their ecological roles.
  • The identification and characterization of a novel microcystin variant contribute to understanding toxin diversity and impact.