Phosphatase-associated protein MoTip41 interacts with the phosphatase MoPpe1 to mediate crosstalk between TOR and cell wall integrity signalling during infection by the rice blast fungus Magnaporthe oryzae |
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Authors: | Bin Qian Xinyu Liu Ziyuan Ye Qikun Zhou Peng Liu Ziyi Yin Wenhao Wang Xiaobo Zheng Haifeng Zhang Zhengguang Zhang |
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Institution: | 1. Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, China;2. Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China |
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Abstract: | The type 2A (PP2A) and type 2A-like (PP4 and PP6) serine/threonine phosphatases participate in a variety of cellular processes, such as cell cycle progression, signal transduction and apoptosis. Previously, we reported that the PP6 catalytic subunit MoPpe1, which interacts with and is suppressed by type 2A associated protein of 42 kDa (MoTap42), an essential protein involved in the target of rapamycin (TOR) signalling pathway, has important roles in development, virulence and activation of the cell wall integrity (CWI) pathway in the rice blast fungus Magnaporthe oryzae. Here, we show that Tap42-interacting protein 41 (MoTip41) mediates crosstalk between the TOR and CWI signalling pathways; and participates in the TOR pathway via interaction with MoPpe1, but not MoTap42. The deletion of MoTIP41 resulted in disruption of CWI signalling, autophagy, vegetative growth, appressorium function and plant infection, as well as increased sensitivity to rapamycin. Further investigation revealed that MoTip41 modulates activation of the CWI pathway in response to infection by interfering with the interaction between MoTap42 and MoPpe1. These findings enhance our understanding of how crosstalk between TOR and CWI signalling modulates the development and pathogenicity of M. oryzae. |
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