Activating transcription factor 2, also known as ATF2, is a protein that, in humans, is encoded by the ATF2gene.[5]
Function
This gene encodes a transcription factor that is a member of the leucine zipper family of DNA-binding proteins. This protein binds to the cAMP-responsive element (CRE), an octameric palindrome. The protein forms a homodimer or heterodimer with c-Jun. The protein is also a histone acetyltransferase (HAT) that specifically acetylates histones H2B and H4 in vitro; thus, it may represent a class of sequence-specific factors that activate transcription by direct effects on chromatin components. Additional transcript variants have been identified but their biological validity has not been determined.[5]
The gene atf2 is located at human chromosome 2q32.[6] The protein ATF-2 has 505 amino acids. Studies in mice indicate a role for ATF-2 in the development of nervous system and the skeleton.[7] ATF-2 is normally activated in response to signals that converge on stress-activated protein kinases p38 and JNK.[8] ATF-2 phosphorylation in response to treatment of cells with tumor promoter phorbol ester has been demonstrated.[9]
Several studies implicate abnormal activation of ATF-2 in growth and progression of mammalian skin tumors.[10][11] ATF-2 may mediate oncogenesis caused by mutant Ras protein[12] and regulate maintenance of the aggressive cancer phenotype of some types of epithelial cells.
ATF2 has also been shown to be phosphorylated at its C-terminal (serine 472 and 480 in mouse; serine 490 and 498 in human) by ATM upon double-stranded breaks.[13] Mice with mutations of these two serines are sensitive to irradiation and easier to tumorigenesis under p53 knockout background.
Interactions
Activating transcription factor 2 has been shown to interact with
^Ozawa K, Sudo T, Soeda E, Yoshida MC, Ishii S (1991). "Assignment of the human CREB2 (CRE-BP1) gene to 2q32". Genomics. 10 (4): 1103–4. doi:10.1016/0888-7543(91)90210-6. PMID1833307.
^Leslie MC, Bar-Eli M (2005). "Regulation of gene expression in melanoma: new approaches for treatment". J. Cell. Biochem. 94 (1): 25–38. doi:10.1002/jcb.20296. PMID15523674. S2CID23515325.
^Papassava P, Gorgoulis VG, Papaevangeliou D, Vlahopoulos S, van Dam H, Zoumpourlis V (2004). "Overexpression of activating transcription factor-2 is required for tumor growth and progression in mouse skin tumors". Cancer Res. 64 (23): 8573–84. doi:10.1158/0008-5472.CAN-03-0955. PMID15574764. S2CID14845890.
^Vlahopoulos SA, Logotheti S, Mikas D, Giarika A, Gorgoulis V, Zoumpourlis V (17 March 2008). "The role of ATF-2 in oncogenesis". BioEssays. 30 (4): 314–27. doi:10.1002/bies.20734. PMID18348191. S2CID678541.
^Newell CL, Deisseroth AB, Lopez-Berestein G (July 1994). "Interaction of nuclear proteins with an AP-1/CRE-like promoter sequence in the human TNF-alpha gene". J. Leukoc. Biol. 56 (1): 27–35. doi:10.1002/jlb.56.1.27. PMID8027667. S2CID85570533.
^Murata T, Shinozuka Y, Obata Y, Yokoyama KK (May 2008). "Phosphorylation of two eukaryotic transcription factors, Jun dimerization protein 2 and activation transcription factor 2, in Escherichia coli by Jun N-terminal kinase 1". Anal. Biochem. 376 (1): 115–21. doi:10.1016/j.ab.2008.01.038. PMID18307971.
Ozawa K, Sudo T, Soeda E, Yoshida MC, Ishii S (1991). "Assignment of the human CREB2 (CRE-BP1) gene to 2q32". Genomics. 10 (4): 1103–4. doi:10.1016/0888-7543(91)90210-6. PMID1833307.
Diep A, Li C, Klisak I, Mohandas T, Sparkes RS, Gaynor R, Lusis AJ (1991). "Assignment of the gene for cyclic AMP-response element binding protein 2 (CREB2) to human chromosome 2q24.1-q32". Genomics. 11 (4): 1161–3. doi:10.1016/0888-7543(91)90047-I. PMID1838349.
Newell CL, Deisseroth AB, Lopez-Berestein G (1994). "Interaction of nuclear proteins with an AP-1/CRE-like promoter sequence in the human TNF-alpha gene". J. Leukoc. Biol. 56 (1): 27–35. doi:10.1002/jlb.56.1.27. PMID8027667. S2CID85570533.