Abstract
The nucleotide-binding domain (NBD) and leucine-rich repeat (LRR) containing (NLR) proteins are a large family of intracellular immune receptors conserved in both animals and plants. Mammalian NLRs function as pattern recognition receptors (PRRs) to sense pathogen-associated molecular patterns (PAMPs) or host-derived danger associated molecular patterns (DAMPs). PAMP or DAMP perception activates NLRs which consequently recruit pro-caspase-1 directly or indirectly. These sequential events result in formation of large multimeric protein complexes termed inflammasomes that mediate caspase-1 activation for pyroptosis and cytokine secretion. Recent structural and biochemical studies provide significant insights into the acting mechanisms of NLR proteins. In this chapter, we review and discuss these studies concerning autoinhibition, ligand recognition, activation of NLRs, and assembly of NLR inflammasomes.
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