Anti-IKK alpha/CHUK Antibody Picoband® Fluoro647 Conjugated

IKKA, also known as conserved helix-loop-helix ubiquitous kinase (CHUK) or IKBKA, is a protein kinase that in humans is encoded by the CHUK gene. It is mapped to 10q24.31. This gene encodes a member of the serine/threonine protein kinase family. The encoded protein, a component of a cytokine-activated protein complex that is an inhibitor of the essential transcription factor NF-kappa-B complex, phosphorylates sites that trigger the degradation of the inhibitor via the ubiquination pathway, thereby activating the transcription factor. IKKA is part of the IκB kinase complex that plays an important role in regulating the NF-κB transcription factor. However, IKKA also has many additional cellular targets, and is thought to function independently of the NF-κB pathway to regulate epidermal differentiation.

Inhibitor of nuclear factor kappa-B kinase subunit alpha; I-kappa-B kinase alpha; IKK-A; IKK-alpha; IkBKA; IkappaB kinase;2.7.11.10; Conserved helix-loop-helix ubiquitous kinase; I-kappa-B kinase 1; IKK1; Nuclear factor NF-kappa-B inhibitor kinase alpha; NFKBIKA; Transcription factor 16; TCF-16; CHUK; IKKA, TCF16

E.coli-derived human IKK alpha recombinant protein (Position: V411-E745) . Human IKK alpha shares 98% amino acid (aa) sequence identity with mouse IKK alpha.

Atherosclerosis, Cardiovascular, Epigenetics and Nuclear Signaling, Immunology, Innate Immunity, NFKB Pathway, Nuclear Signaling Pathways, Protein Phosphorylation, Ser/Thr Kinases, Signal Transduction, TLR Signaling, Vascular Inflammation

Serine kinase that plays an essential role in the NF- kappa-B signaling pathway which is activated by multiple stimuli such as inflammatory cytokines, bacterial or viral products, DNA damages or other cellular stresses. Acts as part of the canonical IKK complex in the conventional pathway of NF-kappa-B activation and phosphorylates inhibitors of NF-kappa-B on serine residues. These modifications allow polyubiquitination of the inhibitors and subsequent degradation by the proteasome. In turn, free NF-kappa-B is translocated into the nucleus and activates the transcription of hundreds of genes involved in immune response, growth control, or protection against apoptosis. Negatively regulates the pathway by phosphorylating the scaffold protein TAXBP1 and thus promoting the assembly of the A20/TNFAIP3 ubiquitin-editing complex (composed of A20/TNFAIP3, TAX1BP1, and the E3 ligases ITCH and RNF11) . Therefore, CHUK plays a key role in the negative feedback of NF-kappa-B canonical signaling to limit inflammatory gene activation. As part of the non-canonical pathway of NF-kappa-B activation, the MAP3K14-activated CHUK/IKKA homodimer phosphorylates NFKB2/p100 associated with RelB, inducing its proteolytic processing to NFKB2/p52 and the formation of NF-kappa- B RelB-p52 complexes. In turn, these complexes regulate genes encoding molecules involved in B-cell survival and lymphoid organogenesis. Participates also in the negative feedback of the non-canonical NF-kappa-B signaling pathway by phosphorylating and destabilizing MAP3K14/NIK. Within the nucleus, phosphorylates CREBBP and consequently increases both its transcriptional and histone acetyltransferase activities. Modulates chromatin accessibility at NF-kappa-B-responsive promoters by phosphorylating histones H3 at 'Ser-10' that are subsequently acetylated at 'Lys-14' by CREBBP. Additionally, phosphorylates the CREBBP-interacting protein NCOA3. .

1. Mock BA, Connelly MA, McBride OW, Kozak CA, Marcu KB (May 1995) . CHUK, a conserved helix-loop-helix ubiquitous kinase, maps to human chromosome 10 and mouse chromosome 19. Genomics27 (2) : 348–51. 2. Häcker H, Karin M (October 2006) . Regulation and function of IKK and IKK-related kinases.Sci. STKE 2006 (357) : re13. 3. Descargues P, Sil AK, Karin M (October 2008) . IKKα, a critical regulator of epidermal differentiation and a suppressor of skin cancer. EMBO J. 27 (20) : 2639–47. 4. Zhu F, Park E, Liu B, Xia X, Fischer SM, Hu Y (February 2009) . Critical role of IkappaB kinase alpha in embryonic skin development and skin carcinogenesis. Histol. Histopathol. 24 (2) : 265–71.