Formation of cyclotides and variations in cyclotide expression in <Emphasis Type="Italic">Oldenlandia affinis</Emphasis> suspension cultures |
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Authors: | Peter Seydel Christian W Gruber David J Craik Heike Dörnenburg |
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Institution: | (1) Institute of Bioprocess Engineering, University of Erlangen–Nuremberg, 91052 Erlangen, Germany;(2) Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia |
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Abstract: | Cyclotides, a family of disulfide-rich mini-proteins, show a wide range of biological activities, making them interesting
targets for pharmaceutical and agrochemical applications, but little is known about their natural function and the events
that trigger their expression. An investigation of nutritional variations and irradiation during a batch process involving
plant cell cultures has been performed, using the native African medical herb, Oldenlandia affinis, as a model plant. The results demonstrated the biosynthesis of kalata B1, the main cyclotide in O. affinis, in a combined growth/nongrowth-associated pattern. The highest concentration, 0.37 mg g−1 dry weight, was accumulated in irradiated cells at 35 μmol m−2 s−1. Furthermore, 12 novel cyclotides were identified and the expression of various cyclotides compared in irradiated vs non-irradiated
cultures. The results indicate that cyclotide expression varies greatly depending on physiological conditions and environmental
stress. Kalata B1 is the most abundant cyclotide in plant suspension cultures, which underlies its importance as a natural
defense molecule. The identification of novel cyclotides in suspension cultures, compared to whole plants, indicates that
there may be more novel cyclotides to be discovered and that the genetic network regulating cyclotide expression is a very
sensitive system, ready to adapt to the current environmental growth condition. |
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Keywords: | Cyclotides Circular backbone CCK Plant cell suspension cultures Heterotrophic mode Nongrowth-associated pattern |
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