文献类型：期刊文献

英文题名：Regulation of the HMOX1 gene by the transcription factor AP-2δ with unique DNA binding site

作者：Sun, Liyun[1,2];Zhao, Yuxia[1];Gu, Shaohua[2];Mao, Yumin[2];Ji, Chaoneng[2];Xin, Xiujuan[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Fudan Univ, Sch Life Sci, Inst Genet, State Key Lab Genet Engn, Shanghai 200433, Peoples R China

年份：2014

卷号：10

期号：1

起止页码：423

外文期刊名：MOLECULAR MEDICINE REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000337764600064)】；

基金：The present study was supported by the Fundamental Research Funds for the Central Universities (no. 222201314027) and Fundamental Research Funds for the Central Universities (no. wf1114045).

语种：英文

外文关键词：AP-2 delta; heme oxygenase-1; luciferase assay; electromobility shift assays

摘要：AP-2 transcription factors are important sequence-specific DNA-binding regulators that are expressed in the neural crest and other tissues during mammalian development. The human AP-2 family of transcription factors consists of five members, AP-2 alpha, -beta, -gamma, -delta and -epsilon, which have an important role in the regulation of gene expression during development and in the differentiation of multiple organs and tissues. The present study aimed to investigate the mechanism by which AP-2 delta mediates heme oxygenase-1 (HMOX1) gene expression. It was identified that the human AP-2 delta protein exhibited weak binding to a suboptimal AP-2 sequence, 5'-GCCN3GGC-3', to which all other AP-2 proteins bind in vitro, providing the first example of DNA target specificity amongst the AP-2 family. AP-2 delta protein bound to an optimized AP-2 consensus DNA sequence, 5'-GCCTGAGGC-3', in vitro and transactivated gene expression in eukaryotic cells. The transactivation domain of Ap-2 delta differs notably from those in the other AP-2 proteins as it lacks the PY motif (XPPXY) and several other conserved residues that are important for the transcriptional activity of AP-2 proteins, yet it functions as an equally strong activator.