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"Finally, they showed that phosphorylation of S198 by JNK1 allows for de-ubiquitylation of NLRP3 by BRCC3, an essential step for NLRP3 inflammasome activation.Unpublished data from our laboratory have confirmed that the S198D mutant protein drives stronger inflammasome activation compared to WT NLRP3 (ASC speck formation, caspase-1 cleavage) based on a reconstitution assay related to that published by Song et al. (39)."
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"For example, breast cancer 1 (BRCA1)/breast cancer 2 (BRCA2) and containing complex subunit 3 (BRCC3) deubiquitinates NLRP3, and pharmaceutical inhibition of DUBs restricts inflammasome activation [XREF_BIBR, XREF_BIBR, XREF_BIBR], whereas E3 ubiquitin ligases LUBAC and TRIM33 promote inflammasome assembly [XREF_BIBR, XREF_BIBR]."
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"Our findings indicate that cholesterol trafficking from the plasma membrane (PM) to the endoplasmic reticulum (ER), via Aster-B leads to the activation of calcium/calmodulin-dependent kinase II (CaMKII) and JNK and subsequent NLRP3 deubiquitylation by BRCC3 to promote NLRP3 inflammasome activation."
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"For instance, ubiquitination of NLRP3 by FBXL12, TRIM1, ARIH2 or the dopamine induced E3 ligase MARCH7 promotes the proteasomal degradation of NLRP3 in resting macrophages, whereas deubiquitylation of NLRP3 LRR domain on K63 by BRCC3 triggers ASC oligomerization and inflammasome activation (XREF_FIG)."
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"For example, ATP and TLR-4 may activate the deubiquitination of NLRP3 in macrophages (41) by the enzyme BRCA1/BRCA2-containing complex subunit 3 (BRCC3) (42) and c-Jun N-terminal kinase (JNK1)-mediated NLRP3 S194 phosphorylation may induce NLRP3 deubiquitination with a subsequent inflammasome assembly (43)."
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"46 In addition, the loss of interaction between A20 p.(Lys91*) mutant and the BRCC3-containing BRISC complex suggests a further novel NLRP3-regulating function of A20 that is lost in haploinsufficient cells, as BRCC3 deubiquitinates the NLRP3 receptor directly promoting its activation."
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"Moreover, a recent report described that R779C, a gain of function mutation of NLRP3, promotes NLRP3 de-ubiquitylation by BRCC3 and JOSD2 to promote NLRP3 activation, which increases the risk of developing Very-early-onset inflammatory bowel disease (VEOIBD), a chronic inflammatory disease of the gastrointestinal tract can happen in early childhood (Zhou et al., 2021)."