The fungal-specific β-glucan-binding lectin FGB1 alters cell-wall composition and suppresses glucan-triggered immunity in plants

Stephan Wawra, Philipp Fesel, Heidi Widmer, Malte Timm, Jürgen Seibel, Lisa Leson, Leona Kesseler, Robin Nostadt, Magdalena Hilbert, Gregor Langen and Alga Zuccaro ()
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Stephan Wawra: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Philipp Fesel: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Heidi Widmer: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Malte Timm: University of Würzburg, Institute of Organic Chemistry
Jürgen Seibel: University of Würzburg, Institute of Organic Chemistry
Lisa Leson: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Leona Kesseler: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Robin Nostadt: Max-Planck-Institute for Terrestrial Microbiology
Magdalena Hilbert: Max-Planck-Institute for Terrestrial Microbiology
Gregor Langen: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)
Alga Zuccaro: University of Cologne, Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS)

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract β-glucans are well-known modulators of the immune system in mammals but little is known about β-glucan triggered immunity in planta. Here we show by isothermal titration calorimetry, circular dichroism spectroscopy and nuclear magnetic resonance spectroscopy that the FGB1 gene from the root endophyte Piriformospora indica encodes for a secreted fungal-specific β-glucan-binding lectin with dual function. This lectin has the potential to both alter fungal cell wall composition and properties, and to efficiently suppress β-glucan-triggered immunity in different plant hosts, such as Arabidopsis, barley and Nicotiana benthamiana. Our results hint at the existence of fungal effectors that deregulate innate sensing of β-glucan in plants.

Date: 2016
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DOI: 10.1038/ncomms13188

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