ArticleNature communications2026
Rice PROTEIN L-ISOASPARTYL METHYLTRANSFERASES provides tolerance against sheath blight disease and repairs ALDH and PBZ1.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Protein L-isoaspartyl methyltransferase (PIMT) regulates key seed traits and abiotic stress tolerance in plants by repairing isoaspartyl (isoAsp) damaged proteins. However, whether PIMT-mediated repair is induced and is required during biotic stress tolerance remains unknown. Using rice lines with OsPIMT overexpression, RNAi-mediated suppression, and genome editing, we show that PIMT enhances tolerance to sheath blight (ShB) caused by Rhizoctonia solani. OsPIMT restricts fungal penetration and colonization of rice sheaths. Co-immunoprecipitation coupled with LC-MS/MS identify various proteins including antioxidant proteins, aldehyde dehydrogenases (ALDH) and pathogenesis-related protein 10 (PBZ1), that undergo isoAsp modification during R. solani infection and interact with PIMT. We show that OsALDH and OsPBZ1 exhibit intrinsic antifungal activity against R. solani, but isoAsp modification impairs their activity, making PIMT mediated repair important. Further, OsALDH enhances tolerance to R. solani by inhibiting lipid peroxidation and ROS homeostasis in rice and fungus. Overall, our study reveals that PIMT enhances ShB tolerance through the repair of isoAsp-damaged proteins important for disease tolerance.
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