|Application ||WB, IHC-P, IF, E|
|Other Accession||P33076, 218511957|
|Reactivity||Human, Mouse, Rat|
|Calculated MW||Predicted: 124 kDa |
Observed: 125 kDa
|Application Notes||CIITA antibody can be used for detection of CIITA by Western blot at 1 µg/mL. Antibody can also be used for immunohistochemistry starting at 10 µg/mL. For immunofluorescence start at 20 µg/mL.|
|Reconstitution & Storage||CIITA antibody can be stored at 4℃ for three months and -20℃, stable for up to one year. As with all antibodies care should be taken to avoid repeated freeze thaw cycles. Antibodies should not be exposed to prolonged high temperatures.|
|Precautions||CIITA Antibody is for research use only and not for use in diagnostic or therapeutic procedures.|
|Function||Essential for transcriptional activity of the HLA class II promoter; activation is via the proximal promoter. No DNA binding of in vitro translated CIITA was detected. May act in a coactivator-like fashion through protein-protein interactions by contacting factors binding to the proximal MHC class II promoter, to elements of the transcription machinery, or both. Alternatively it may activate HLA class II transcription by modifying proteins that bind to the MHC class II promoter. Also mediates enhanced MHC class I transcription; the promoter element requirements for CIITA-mediated transcription are distinct from those of constitutive MHC class I transcription, and CIITA can functionally replace TAF1 at these genes. Exhibits intrinsic GTP-stimulated acetyltransferase activity. Exhibits serine/threonine protein kinase activity: can phosphorylate the TFIID component TAF7, the RAP74 subunit of the general transcription factor TFIIF, histone H2B at 'Ser-37' and other histones (in vitro).|
|Cellular Location||Nucleus. Nucleus, PML body. Note=Recruited to PML body by PML|
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Provided below are standard protocols that you may find useful for product applications.
CIITA Antibody: CIITA contains an acidic transcriptional activation domain, four LRRs (leucine-rich repeats) and a GTP binding domain. It is located in the nucleus and acts as a positive regulator of class II major histocompatibility complex gene transcription, and is referred to as the "master control factor" for the expression of these genes. CIITA also binds GTP and uses GTP binding to facilitate its own transport into the nucleus. Once in the nucleus it does not bind DNA but rather uses an intrinsic acetyltransferase (AT) activity to act in a coactivator-like fashion. Mutations in this gene have been associated with bare lymphocyte syndrome type II (also known as hereditary MHC class II deficiency or HLA class II-deficient combined immunodeficiency), increased susceptibility to rheumatoid arthritis, multiple sclerosis, and possibly myocardial infarction.
LeibundGut-Landmann S, Waldburger JM, Krawczyk M, et al. Mini-review: specificity and expression of CIITA, the master regulator of MHC class II genes. Eur. J. Immunol. 2004; 34:1513-25.
Harton JA, Cressman DE, Chin KC, et al. GTP binding by class II transactivator: role in nuclear import. Science 1999; 285:1402-5.
Raval A, Howcroft TK, Weissman JD, et al. Transcriptional coactivator, CIITA, is an acetyltransferase that bypasses a promoter requirement for TAF(II)250. Mol. Cell 2001; 7:105-15.
Inohara C, McDonald C, and Nunez G. NOD-LRR proteins: role in host-microbial interactions and inflammatory disease. Annu. Rev. Biochem. 2005; 74:355-83.
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