BACKGROUND C/EBPalpha is the prototypical basic-region leucine zipper (bZIP) transcription factor. This family is characterized by the presence of a basic region that mediates DNA binding and a leucine zipper that allows dimer formation. In addition to forming homodimers, C/EBPalpha dimerizes with other members of the C/EBP family (C/EBPbeta, -gamma, -delta, episilon, and CHOP) and interacts with other proteins such as TFIIB, TBP, Rb, p300/CBP, p21, and members of the SWI/SNF complex.1 C/EBPalpha mRNA can be translated from the first AUG encoding the 42-kDa normal isoform and also from the second AUG (nt 508–510) encoding the 30-kDa normal isoform. The functions of C/EBPalpha 30-kDa protein are not well known. It was suggested that this shorter C/EBPalpha protein had lost normal C/EBPalpha functions and had dominant negative effect on 42-kDa wild-type (wt) C/EBPalpha. Recently, it has been shown that C/EBPalpha is regulated by phosphorylation and sumoylation.2
A key role of C/EBPalpha is to regulate differentiation of a select set of cell types. It acts as a transcription factor with a crucial role during differentiation of various cell types including hepatocytes, adipocytes, enterocytes, keratinocytes, lung, mammary gland cells and hematopoietic cells.3 Several recent studies highlight the crucial antimitotic role of C/EBPalpha, which inhibits cell growth through a variety of mechanisms. First, C/EBPalpha induces expression and stability of the cyclin-dependent kinase inhibitor, p21/WAF1. Second, C/EBPalpha interacts directly with the cyclin-dependent kinases Cdk2 and Cdk4 and blocks their ability to interact with cyclins, thereby impeding cell cycle progression. Finally, C/EBPalpha directly represses the activity of E2F, a key transcriptional regulator of cell cycle genes.4
1. Darlington, G.J. et al: J. Biol. Chem. 273:30057-60, 1998 2. Ross, S.E. et al: Mol. Cell. Biol. 24:675-86, 2004 3. Lekstrome-Himes, J & Xanthopoulus, K.G.: J. Biol. Chem. 273:28545-48, 1998 4. Timchenko, N.A. et al: Gene Dev. 10:804-15, 1996
Products are for research use only. They are not intended for human, animal, or diagnostic applications.
|Synthesized peptide derived from human C/EBP-α protein.|
Species & predicted
reactivity ( ):
|Mouse, Human, Rat|
Weight of protein:
|37 KDa |
|Detects endogenous C/EBP-alpha proteins without cross reactivity with other family members.|
Store at -20°C, 4°C for frequent use. Avoid repeated freeze-thaw cycles.
*Optimal working dilutions must be determined by end user.