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Pyrin Domain
A pyrin domain (PYD, also known as PAAD/DAPIN) is a protein domain and a subclass of protein motif known as the death fold, the 4th and most recently discovered member of the death domain superfamily (DDF). It was initially discovered in the pyrin protein, also known as marenostrin, which is encoded by MEFV. The mutation of the MEFV gene is the cause of the disease known as Familial Mediterranean fever, Familial Mediterranean Fever. The domain is encoded in 23 human proteins and at least 31 mouse genes. Proteins containing a pyrin domain are frequently involved in programmed cell death processes, including pyroptosis and apoptosis. Proteins that possess a pyrin domain interact with the pyrin domains of other proteins to form multi-protein complexes called inflammasomes, triggering downstream immune responses. Structure Pyrin domains are a ~90 amino acid Protein motif, motif present only at the N-terminus of proteins. The core is composed of highly conserved hydrophobic residue ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflammasome
Inflammasomes are cytosolic multiprotein complexes of the innate immune system responsible for the activation of inflammatory responses and cell death. They are formed as a result of specific cytosolic pattern recognition receptors (PRRs) sensing microbe-derived pathogen-associated molecular patterns (PAMPs), damage-associated molecular patterns (DAMPs) from the host cell, or homeostatic disruptions. Activation and assembly of the inflammasome promotes the activation of caspase-1, which then proteolytically cleaves pro-inflammatory cytokines, interleukin 1β (IL-1β) and interleukin 18 (IL-18), as well as the pore-forming molecule gasdermin D ( GSDMD). The N-terminal GSDMD fragment resulting from this cleavage induces a pro-inflammatory form of programmed cell death distinct from apoptosis, referred to as pyroptosis, which is responsible for the release of mature cytokines. Additionally, inflammasomes can act as integral components of larger cell death-inducing complexes ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nodosome
Nodosome refers to protein complexes involving pattern recognition receptors and intracellular pathogen sensors NOD2 and CARD8. Their activation leads to regulation of caspase-1 and NF-kappa-B. See also * Inflammasome * Innate immunity The innate immune system or nonspecific immune system is one of the two main immunity strategies in vertebrates (the other being the adaptive immune system). The innate immune system is an alternate defense strategy and is the dominant immune s ... References Protein complexes {{protein-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muramyl Dipeptide
Muramyl dipeptide is a component of bacterial peptidoglycan, a recognition structure or activator for nucleotide-binding oligomerization domain 2 (NOD2) protein. It is a constituent of both Gram-positive and Gram-negative bacteria composed of N-acetylmuramic acid linked by its lactic acid moiety to the N-terminus of an L-alanine D- isoglutamine dipeptide. It can be recognized by the immune system as a pathogen-associated molecular pattern and activate the NALP3 inflammasome which, in turn, leads to cytokine activation, IL-1α and IL-1β especially. Human NOD2 protein of the nucleotide-binding leucine-rich repeat family, is a cytoplasmic receptor involved in host innate immune system defense. Mutations in the ''CARD15'' gene encoding NOD2 protein have been observed in Crohn's disease patients, decreasing the immune systems of these patients ability to recognize muramyl dipeptide. Analogues of muramyl dipeptide and their potential for immune response therapies in cancer and dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IFI16
Gamma-interferon-inducible protein Ifi-16 (Ifi-16) also known as interferon-inducible myeloid differentiation transcriptional activator is a protein that in humans is encoded by the ''IFI16'' gene. Function This gene encodes a member of the HIN-200 (hematopoietic interferon-inducible nuclear antigens with 200 amino acid repeats) family of cytokines. The encoded protein contains domains involved in DNA binding, transcriptional regulation, and protein-protein interactions. The protein localizes to the nucleoplasm and nucleoli, and interacts with p53. It modulates p53 function, and inhibits cell growth in the Ras/Raf signaling pathway. IFI16 has been shown to play a role in the sensing of intracellular DNA - a hallmark of virally infected cells - and has also been linked to the death of HIV-infected helper CD4 T cells by pyroptosis, a highly inflammatory form of programmed cell death. Recently, it has been shown how IFI16, once extracellularly released, can induce inflammation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NLRP3
NLR family pyrin domain containing 3 (NLRP3) (previously known as NACHT, LRR, and PYD domains-containing protein 3 [NALP3] and cryopyrin), is a protein that in humans is encoded by the ''NLRP3'' gene located on the long arm of chromosome 1. NLRP3 is expressed predominantly in macrophages and as a component of the inflammasome, detects products of damaged cells such as extracellular adenosine triphosphate, ATP and crystalline uric acid. Activated NLRP3 in turn triggers an immune response. Mutations in the NLRP3 gene are associated with a number of organ specific autoimmune diseases. Nomenclature NACHT, LRR, and PYD are respectively acronyms for: * NACHT domain, NACHT – NAIP (neuronal apoptosis inhibitor protein), C2TA [class 2 transcription activator, of the Major histocompatibility complex, MHC, HET-E (Podospora anserina#Heterokaryon incompatibility, heterokaryon incompatibility) and TP1 (telomerase-associated protein 1) * Leucine-rich repeat, LRR – "leucine-rich repeat" a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NLRP2
NACHT, LRR and PYD domains-containing protein 2 is a protein that in humans is encoded by the ''NLRP2'' gene. NALP proteins, such as NALP2, are characterized by an N-terminal pyrin domain (PYD) and are involved in the activation of caspase-1 (CASP1; MIM 147678) by Toll-like receptors(see TLR4). They may also be involved in protein complexes that activate proinflammatory caspases (Tschopp et al., 2003). upplied by OMIMref name="entrez"> Function The NLRP2 gene is one of the family members of nucleotide-binding and leucine-rich repeat receptor (NLR). Information from many literature sources indicates that an N-terminal pyrin effector domain (PYD) is one of the components of the NLRP2 gene. Other components include a centrally-located nucleotide-binding and oligomerization domain (NACHT) and C-terminal leucine-rich repeats (LRR). The products of NLRP2 gene are known to interact with IkB kinase (IKK) complex components. It can also regulate the activities of both caspase-1 and nuc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NLRP1
NLRP1 encodes NACHT, LRR, FIIND, CARD domain and PYD domains-containing protein 1 in humans. NLRP1 was the first protein shown to form an inflammasome. Material was copied from this source, which is available under Creative Commons Attribution 4.0 International License NLRP1 is expressed by a variety of cell types, which are predominantly epithelial or hematopoietic. The expression is also seen within glandular epithelial structures including the lining of the small intestine, stomach, airway epithelia and in hairless or glabrous skin. NLRP1 polymorphisms are associated with skin extra-intestinal manifestations in CD. Its highest expression was detected in human skin, in psoriasis and in vitiligo. Polymorphisms of NLRP1 were found in lupus erythematosus and diabetes type 1. Variants of mouse NLRP1 were found to be activated upon N-terminal cleavage by the protease in anthrax lethal factor. Function This gene encodes a member of the Ced-4 family of apoptosis proteins. Ced-fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interleukin-18 Receptor
The interleukin-18 receptor (IL-18R) is an interleukin receptor of the immunoglobulin superfamily. Endometrial IL-18 receptor mRNA and the ratio of IL-18 binding protein to interleukin 18 are significantly increased in adenomyosis Adenomyosis is a medical condition characterized by the growth of cells that proliferate on the inside of the uterus (endometrium) atypically located among the cells of the uterine wall (myometrium), as a result, thickening of the uterus occurs. ... patients in comparison to normal people, indicating a role in its pathogenesis. References External links * Clusters of differentiation Immunoglobulin superfamily cytokine receptors {{membrane-protein-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interleukin 1 Beta
Interleukin-1 beta (IL-1β) also known as leukocytic pyrogen, leukocytic endogenous mediator, mononuclear cell factor, lymphocyte activating factor and other names, is a cytokine protein that in humans is encoded by the ''IL1B'' gene."Catabolin" is the name given by Jeremy Saklatvala for IL-1 alpha. There are two genes for interleukin-1 (IL-1): IL-1 alpha and IL-1 beta (this gene). IL-1β precursor is cleaved by cytosolic caspase 1 (interleukin 1 beta convertase) to form mature IL-1β. Function The fever-producing property of human leukocytic pyrogen (interleukin 1) was purified by Dinarello in 1977 with a specific activity of 10–20 nanograms/kg. In 1979, Dinarello reported that purified human leukocytic pyrogen was the same molecule that was described by Igal Gery in 1972. He named it lymphocyte-activating factor (LAF) because it was a lymphocyte mitogen. It was not until 1984 that interleukin 1 was discovered to consist of two distinct proteins, now called interleukin-1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AIM2
Interferon-inducible protein AIM2 also known as absent in melanoma 2 or simply AIM2 is a protein that in humans is encoded by the ''AIM2'' gene. AIM2 is a cytoplasmic sensor found in hematopoietic cells that recognizes the presence of double-stranded DNA (dsDNA) of microbial or host cellular origin. AIM2-like receptor (ALR) family was founded on AIM2 and now consists of four members in human genome. Activated AIM2 recruits apoptosis-associated speck-like protein containing a CARD (ASC), resulting in caspase-1 binding, and forming of AIM2 inflammasome. This signaling contributes to the defense against bacterial and viral DNA. The AIM2 inflammasome can also be an integral component of the AIM2-PANoptosome to drive PANoptosis. Structure Proteins belonging to ALR family usually contain an N-terminal pyrin (PYD) domain, and one or two HIN domains. AIM2 consists of two domains connected through a long linker: an N-terminal PYD domain (amino acids 1-87), and a C-terminal HIN-200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NOD-like Receptor
The nucleotide-binding oligomerization domain-like receptors, or NOD-like receptors (NLRs) (also known as nucleotide-binding leucine-rich repeat receptors), are intracellular sensors of pathogen-associated molecular patterns (PAMPs) that enter the cell via phagocytosis or pores, and damage-associated molecular patterns (DAMPs) that are associated with cell stress. They are types of pattern recognition receptors (PRRs), and play key roles in the regulation of innate immune response. NLRs can cooperate with toll-like receptors (TLRs) and regulate inflammatory and apoptotic response. NLRs primarily recognize Gram-positive bacteria, whereas TLRs primarily recognize Gram-negative bacteria. They are found in lymphocytes, macrophages, dendritic cells and also in non-immune cells, for example in epithelium. NLRs are highly conserved through evolution. Their homologs have been discovered in many different animal species ( APAF1) and also in the plant kingdom ( disease-resistance R pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
