Recombinant Human Receptor-interacting serine/threonine-protein kinase 2 (RIPK2)

Function

Serine/threonine/tyrosine-protein kinase that plays an essential role in modulation of innate and adaptive immune responses (PubMed:14638696, PubMed:17054981, PubMed:21123652, PubMed:28656966, PubMed:9575181, PubMed:9642260). Acts as a key effector of NOD1 and NOD2 signaling pathways: upon activation by bacterial peptidoglycans, NOD1 and NOD2 oligomerize and recruit RIPK2 via CARD-CARD domains, leading to the formation of RIPK2 filaments (PubMed:17054981, PubMed:17562858, PubMed:21123652, PubMed:22607974, PubMed:28656966, PubMed:29452636, PubMed:30026309). Once recruited, RIPK2 autophosphorylates and undergoes 'Lys-63'-linked polyubiquitination by E3 ubiquitin ligases XIAP, BIRC2 and BIRC3, as well as 'Met-1'-linked (linear) polyubiquitination by the LUBAC complex, becoming a scaffolding protein for downstream effectors (PubMed:22607974, PubMed:28545134, PubMed:29452636, PubMed:30026309, PubMed:30279485, PubMed:30478312). 'Met-1'-linked polyubiquitin chains attached to RIPK2 recruit IKBKG/NEMO, which undergoes 'Lys-63'-linked polyubiquitination in a RIPK2-dependent process (PubMed:17562858, PubMed:22607974, PubMed:29452636, PubMed:30026309). 'Lys-63'-linked polyubiquitin chains attached to RIPK2 serve as docking sites for TAB2 and TAB3 and mediate the recruitment of MAP3K7/TAK1 to IKBKG/NEMO, inducing subsequent activation of IKBKB/IKKB (PubMed:18079694). In turn, NF-kappa-B is released from NF-kappa-B inhibitors and translocates into the nucleus where it activates the transcription of hundreds of genes involved in immune response, growth control, or protection against apoptosis (PubMed:18079694). The protein kinase activity is dispensable for the NOD1 and NOD2 signaling pathways (PubMed:29452636, PubMed:30026309). Contributes to the tyrosine phosphorylation of the guanine exchange factor ARHGEF2 through Src tyrosine kinase leading to NF-kappa-B activation by NOD2 (PubMed:21887730). Also involved in adaptive immunity: plays a role during engagement of the T-cell receptor (TCR) in promoting BCL10 phosphorylation and subsequent NF-kappa-B activation (PubMed:14638696). Plays a role in the inactivation of RHOA in response to NGFR signaling (PubMed:26646181)

Subcellular Location

Cytoplasm; Cell membrane (Peripheral membrane protein); Endoplasmic reticulum

Tissue Specificity

Detected in heart, brain, placenta, lung, peripheral blood leukocytes, spleen, kidney, testis, prostate, pancreas and lymph node

Subunit

Interacts (via CARD domain) with NOD2 (via CARD domain) (PubMed:15044951, PubMed:17355968, PubMed:19592251, PubMed:21887730, PubMed:27812135, PubMed:30279485, PubMed:30478312). Interacts (via CARD domain) with NOD1 (via CARD domain) (PubMed:17054981, PubMed:30478312). Homooligomer; following interaction with NOD1 or NOD2, homooligomerizes via its CARD domain and forms long filaments named RIPosomes (PubMed:30279485, PubMed:30478312). Found in a signaling complex consisting of at least ARHGEF2, NOD2 and RIPK2 (PubMed:21887730). Interacts with ARHGEF2; the interaction mediates tyrosine phosphorylation of RIPK2 by Src kinase CSK (PubMed:21887730). Interacts with MAP3K4; this interaction sequesters RIPK2 from the NOD2 signaling pathway (PubMed:18775659). Interacts with IKBKG/NEMO (PubMed:18079694). The polyubiquitinated protein interacts with MAP3K7/TAK1; interaction is indirect and is mediated by TAB2 and TAB3 that bind to polyubiquitin chains attached to RIPK2 (PubMed:18079694). Binds to CFLAR/CLARP and CASP1 via their CARD domains (PubMed:9575181). Binds to BIRC3/c-IAP1 and BIRC2/c-IAP2, TRAF1, TRAF2, TRAF5 and TRAF6 (PubMed:21931591). Interacts with NLRP10 (PubMed:22672233). Interacts with CARD9 (By similarity). Interacts with INAVA; the interaction takes place upon PRR stimulation (PubMed:28436939). Interacts (via CARD domain) with NGFR (via death domain) (PubMed:26646181). Interacts with IRGM; promoting RIPK2 degradation (PubMed:36221902)

• Inohara N. et al. RICK, a novel protein kinase containing a caspase recruitment domain, interacts with CLARP and regulates CD95-mediated apoptosis. — J. Biol. Chem. (1998)
• McCarthy J.V. et al. RIP2 is a novel NF-kappaB-activating and cell death-inducing kinase. — J. Biol. Chem. (1998)
• Thome M. et al. Identification of CARDIAK, a RIP-like kinase that associates with caspase-1. — Curr. Biol. (1998)
• Clark H.F. et al. The secreted protein discovery initiative (SPDI), a large-scale effort to identify novel human secreted and transmembrane proteins: a bioinformatics assessment. — Genome Res. (2003)
• Ota T. et al. Complete sequencing and characterization of 21,243 full-length human cDNAs. — Nat. Genet. (2004)
• Nusbaum C. et al. DNA sequence and analysis of human chromosome 8. — Nature (2006)
• The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). — Genome Res. (2004)
• Tanabe T. et al. Regulatory regions and critical residues of NOD2 involved in muramyl dipeptide recognition. — EMBO J. (2004)