Protein: NACHT, LRR and PYD domains-containing protein 1b allele 2 (EC 3.4.-.-) [Cleaved into: NACHT, LRR and PYD domains-containing protein 1b, C-terminus (Nlrp1b1-CT); NACHT, LRR and PYD domains-containing protein 1b, N-terminus (Nlrp1b1-NT)] (A1Z198)
Organism: Mus musculus (Mouse)
Function: Acts as the sensor component of the Nlrp1b inflammasome, which mediates inflammasome activation in response to various pathogen-associated signals, leading to subsequent pyroptosis (By similarity). Inflammasomes are supramolecular complexes that assemble in the cytosol in response to pathogens and other damage-associated signals and play critical roles in innate immunity and inflammation (By similarity). Acts as a recognition receptor (PRR): recognizes specific pathogens and other damage-associated signals: in response to pathogen-associated signals, the N-terminal part of Nlrp1b is degraded by the proteasome, releasing the cleaved C-terminal part of the protein (NACHT, LRR and PYD domains-containing protein 1b, C-terminus), which polymerizes to initiate the formation of the inflammasome complex: the inflammasome directly recruits pro-caspase-1 (proCASP1) independently of PYCARD/ASC and promotes caspase-1 (CASP1) activation, which subsequently cleaves and activates inflammatory cytokines IL1B and IL18 and gasdermin-D (GSDMD), leading to pyroptosis (By similarity). In the absence of GSDMD expression, the Nlrp1b inflammasome is able to recruit and activate CASP8, leading to activation of gasdermin-E (GSDME) (By similarity). Activation of Nlrp1b inflammasome is also required for HMGB1 secretion; the active cytokines and HMGB1 stimulate inflammatory responses (By similarity). Contrary to Nlrp1b allele 1, allele 2 is not activated by Bacillus anthracis lethal toxin.
Subcellular location: Cytoplasm, cytosol {ECO:0000250|UniProtKB:Q2LKW6}.; SUBCELLULAR LOCATION: [NACHT, LRR and PYD domains-containing protein 1b, C-terminus]: Inflammasome {ECO:0000250|UniProtKB:Q2LKW6}.
Interaction partners:
- NLR family CARD domain-containing protein 4
- Interferon-inducible protein AIM2
- NACHT, LRR and PYD domains-containing protein 1a
- Caspase-1
- Pyrin
- NACHT, LRR and PYD domains-containing protein 3
- Apoptosis-associated speck-like protein containing a CARD
- Apoptosis regulator Bcl-2
- Nucleotide-binding oligomerization domain-containing protein 2
- Bcl-2-like protein 1
Sequence:
MEESQYKQEHNKKVAQDEGQEDKDTIFETIEAIEAKLMELKTNPESTFNYGIFPEVYMNQGEEILYPAWSLKEENLFQTFKSLRLFQKLCPRGSGNLVKKSWYPCVPEEGGHIINIQDLFGPNIGTQKEPQLVIIEGAAGIGKSTLARQVKRAWMEGELYRDHFQHVFFFSCRELAQCKKLSLAELITQGQDVPTAPINQILSHPEKLLFILDGIDEPAWVLADQNPELCLYWSQTQPVHTLLGSLLGKSILPEASFLLTTRTTALQKFIPSLPQSCQVEVLGFSDFEQEIYIYKYFAKQIFGIKALMMVESNPVLLTLCEVPWVCWLVCNCLKKQMEQGGDVSLTSQTTTAICLKYISLTIPVHHMRTQLRALCSLAAEGIWKRRTLFSESDLCKQGLDEDAVAIFLKTGVLQKQASSLSYSFAHLCLQEFFASMSCILEDSEERHGDMEMDRIVETLVERYGRQNLFEAPTVRFLFGLLSKEGLKEMEKLFSCSLPGKTKLKLLWHILGKSQPHQPPCLGLLHCLYENQDMKLLTHVMHDLQGTIVPDTDDITHTVLQTNVKHLVVRTDMELMVVTFCIQFCSHMRSLQLNMEGQQGYALTAPRMVLYRWTPITNASWKILFYNLKFNSNLEGLDLSGNPLSYSAVQYLCDAMIYPGCQLKTLWLVECGLTPTYCSLLASVLSACSSLRELDLQLNDLCDDGVRMLCEGLRNRACNLRILRLDLYSLSAQVITELRTLEENNLKLHISSIWMPQMMVPTENMDEEDILTSFKQQRQQSGANPMEILGTEEDFWGPIGPVATEVVYRERNLYRVQLPMAGSYHCPSTRLHFVVTRAVTIEIEFCAWSQFLDKTPLQQSHMVVGPLFDIKAEQGAVTAVYLPHFVSLKDTKASTFDFKVAHFQEHGMVLETPDRVKPGYTVLKNPSFSPMGVVLRIIPAARHFIPITSITLIYYRVNQEEVTLHLYLVPNDCTIQKAIDDEEMKFQFVRINKPPPVDNLFIGSRYIVSGSENLEITPKELELCYRSSKEFQLFSEIYVGNMGSEIKLQIKNKKHMKLIWEALLKPGDLRPALPRIAQALKDAPSLLHFMDQHREQLVARVTSVDPLLDKLHGLVLNEESYEAVRAENTNQDKMRKLFNLSRSWSRACKDLFYQALKETHPHLVMDLLEKSGGVSLGS