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Related Experiment Videos

Variations in cyclotide expression in viola species.

Manuela Trabi1, Erika Svangård, Anders Herrmann

  • 1Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia.

Journal of Natural Products
|May 29, 2004
PubMed
Summary

Cyclotides, circular proteins in violets, show varied expression. Some levels are constant year-round, while others change seasonally, influenced by environmental factors.

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Area of Science:

  • Plant biochemistry
  • Molecular biology
  • Natural product chemistry

Background:

  • Cyclotides are mini-proteins with a cyclic backbone and a conserved cystine knot motif.
  • Found in plants like Viola species, they exhibit diverse biological activities.
  • Their natural function and expression triggers remain largely unknown.

Purpose of the Study:

  • To investigate geographical and seasonal variations in cyclotide profiles.
  • To understand the influence of external factors on cyclotide expression.
  • To compare cyclotide expression patterns in two distinct Viola species.

Main Methods:

  • Analysis of cyclotide profiles in Viola hederacea (Australia) and Viola odorata (Sweden).
  • Monitoring peptide levels across different seasons and geographical locations.

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  • Quantification of cyclotide expression variations.

    • Main Results:

    • Viola hederacea exhibited a stable basal level of some cyclotides, with others appearing seasonally.
    • V. hederacea expresses a core set of cyclotides plus environmentally influenced 'add-ons'.
    • Viola odorata showed up to a 14-fold increase in cyclotide levels during warmer periods.

    Conclusions:

    • Cyclotide expression is influenced by season and environment.
    • Distinct Viola species display different strategies for cyclotide regulation.
    • Climatic variations may correlate with the extent of cyclotide expression variability.