This gene encodes a 105 kD protein which can undergo cotranslational processing by the 26S proteasome to produce a 50 kD protein. The 105 kD protein is a Rel protein-specific transcription inhibitor and the 50 kD protein is a DNA binding subunit of the NF-kappa-B (NFKB) protein complex. NFKB is a transcription regulator that is activated by various intra- and extra-cellular stimuli such as cytokines, oxidant-free radicals, ultraviolet irradiation, and bacterial or viral products. Activated NFKB translocates into the nucleus and stimulates the expression of genes involved in a wide variety of biological functions. Inappropriate activation of NFKB has been associated with a number of inflammatory diseases while persistent inhibition of NFKB leads to inappropriate immune cell development or delayed cell growth. SUBUNIT: Active NF-kappa-B is a heterodimer of an about 50 kDa DNA-binding subunit and the weak DNA-binding subunit p65. Two heterodimers might form a labile tetramer. Also interacts with MAP3K8. NF-kappa-B p50 subunit interacts with NCOA3 coactivator, which may coactivate NF-kappa-B dependent expression via its histone acetyltransferase activity. Interacts with DSIPI, this interaction prevents nuclear translocation and DNA-binding. Interacts with SPAG9 and UNC5CL.
Synonyms: DKFZp686C01211, DNA binding factor KBF1, DNA binding factor KBF1 EBP1, DNA binding factor KBF1 EBP1, DNA-binding factor KBF1, EBP 1, EBP-1, EBP1, KBF1, MGC54151, NF kappa B, NF kappabeta, NF kB1, NFKB 1, NFKB p105, NFKB p50, NFKB1, NFKB1_HUMAN, Nuclear factor kappa B DNA binding subunit, Nuclear factor NF kappa B p105 subunit, Nuclear factor NF kappa B p50 subunit, Nuclear factor NF-kappa-B p50 subunit, Nuclear factor of kappa light polypeptide gene enhancer in B cells 1, Nuclear factor of kappa light polypeptide gene enhancer in B-cells 1, p84/NF-kappa-B1 p98.