SP3 acts as a positive regulator on the core promoter of human ZPK gene.
ZPK (zipper protein kinase)/MUK/DLK/MAP3K12, a member of mixed-lineage kinases (MLKs), is expressed in a tissue-specific manner, particularly in developing brain, and likely to contribute to cytodifferentiation, apoptotic elimination, and migration. To understand the preferential expression of ZPK in neuronal tissues, we have analyzed the putative core promoter region upstream of the first exon of the human ZPK gene. The core promoter region is TATA-less, but contains several potential transcription factor-binding motifs such as a GC-box, all of which are well conserved between human and mouse. Reporter assays and 'gel-shift' analysis using SH-SY5Y cells revealed that a xenobiotic responsive element (XRE)-like motif (GGGCGTGTCC) was preferentially recognized by Sp3, and enhanced the core promoter activity. However, the core promoter activity was still potent even in HeLa cells which barely express ZPK. Our results suggest that, for the selective expression of ZPK gene, cell-specific negative regulatory element(s) which locate outside of the core promoter region repress the potent basic promoter activity.
Itoh
Aki
A
Division of Neurology Research, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.
Wang
Zhili
Z
Ito
Yasuhiro
Y
Reddy
Usha R
UR
Itoh
Takayuki
T
D020816:Amino Acid Motifs; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000378:metabolism; D002454:Cell Differentiation; D045744:Cell Line, Tumor; D002465:Cell Movement; D018076:DNA, Complementary / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry*; D005091:Exons; D017353:Gene Deletion; D017930:Genes, Reporter; D006367:HeLa Cells; D006801:Humans; D008156:Luciferases / Q000378:metabolism; D020930:MAP Kinase Kinase Kinases; D051379:Mice; D008957:Models, Genetic; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D051705:Sp3 Transcription Factor; D014157:Transcription Factors / Q000737:chemistry*; D014158:Transcription, Genetic; D014162:Transfection
D018076:DNA, Complementary; D004268:DNA-Binding Proteins; C497121:SP3 protein, human; C497122:Sp3 protein, mouse; D014157:Transcription Factors; D051705:Sp3 Transcription Factor; D008156:Luciferases; D017346:Protein Serine-Threonine Kinases; D020930:MAP Kinase Kinase Kinases; C090757:mitogen-activated protein kinase kinase kinase 12