Plant NLR immunity activation and execution: a biochemical perspective

Area of Science:

• Plant biology
• Immunology
• Molecular biology

Background:

• Plants possess cell-surface and intracellular receptors for pathogen detection and innate immune response activation.
• Nucleotide-binding/leucine-rich repeat (NLR) proteins are crucial intracellular sensors or mediators of plant immune defense and cell death.
• While genetic bases of NLR immunity are known, molecular mechanisms of NLR activation and signal transmission remain less clear.

Purpose of the Study:

• To review recent structural and biochemical insights into plant NLR sensor and signaling functions.
• To elucidate how different NLR families contribute to plant immunity.
• To compare plant NLR immunity mechanisms with those in mammals.

Main Methods:

• Review of recent protein structural data.
• Review of recent biochemical studies.
• Comparative analysis of plant and mammalian NLRs.

Main Results:

• NLR proteins function as pathogen sensors or downstream mediators in plant immunity.
• NLR activation and signaling involve nucleotide-based second messengers and cellular calcium.
• Plant NLRs utilize plant-specific defense machineries, but share fundamental principles with mammalian NLRs.

Conclusions:

• Plant NLRs, through structural and biochemical mechanisms, converge on nucleotide messengers and calcium to execute immunity.
• Understanding plant NLRs provides insights into conserved immune receptor mechanisms across kingdoms.