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Ursin Stirnemann on Muck Rack

Ursin Stirnemann

As seen in: Nature
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Articles

An HMA-like integrated domain in the wheat tandem kinase WTK4 recognises an RNase-like pathogen effector

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By Zoe Bernasconi, Ursin Stirnemann, Yang Xu, Aline Herger, Renjie Chen, Victoria Widrig, Matthias Heuberger, Mariantonietta Lettieri, Marion Müller, Brande Wulff, Thomas Wicker, Beat Keller, Javier Sánchez-Martín
| Nature Verified
Abstract Proteins with a tandem kinase structure have recently emerged as players in race-specific resistance in cereal crops. However, the molecular understanding of these immune receptors’ resistance mechanisms is limited by the lack of knowledge about the pathogen effectors that they recognise. In this work, we identify AvrWTK4, the wheat powdery mildew RNase-like effector recognised by the wheat tandem kinase protein WTK4, through a combination of bi-parental genetic mapping and mutagenesis.
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Dual recognition of structurally unrelated mildew effectors underlies the broad-spectrum resistance of Pm3e in wheat

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By Lukas Kunz, Zoe Bernasconi, Matthias Heuberger, Jonatan Isaksson, Alexandros G. Sotiropoulos, Ursin Stirnemann, Jigisha Jigisha, Fabrizio Menardo, Thomas Wicker, Marion Müller, Beat Keller
| Nature Verified
Abstract Broad-spectrum resistance genes are highly valuable for sustainable crop protection, yet the molecular basis of their activity is often unknown. The Pm3 allelic series in wheat encodes NLR receptors that recognize avirulence (AVR) effectors of wheat powdery mildew.
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Virulence on Pm4 kinase-based resistance is determined by two divergent wheat powdery mildew effectors - Nature Plants

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By Zoe Bernasconi, Aline Herger, Lukas Kunz, Marion Müller, Megan A Outram, Victoria Widrig, Jonatan Isaksson, Seraina Schudel, Thomas Wicker, Kyle W Bender, Cyril Zipfel, Peter N. Dodds, Melania Figueroa, Javier Sánchez-Martín, Ursin Stirnemann, Sebastian Rösli
| Nature Verified
Abstract The wheat resistance gene Pm4 encodes a kinase fusion protein and has gained particular attention as it confers race-specific resistance against two major wheat pathogens: powdery mildew and blast. Here we describe the identification of AvrPm4, the mildew avirulence effector recognized by Pm4, using UV mutagenesis, and its functional validation in wheat protoplasts. We show that AvrPm4 directly interacts with and is phosphorylated by Pm4.
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