title: ZNF300, a recently identified human transcription factor, activates the human IL-2Rβ promoter through the overlapping ZNF300/EGR1 binding site.
abstract: ZNF300 was recently identified as a member of the human KRAB/C(2)H(2) zinc finger protein family. Little is known about the role of ZNF300 in human gene regulation networks. In this study, the DNA-binding property of ZNF300 was further analyzed. We found that the recombinant ZNF300 could bind to the binding site 5'-GCGGGGGCG-3' of Egr1, another member of the KRAB/C(2)H(2) zinc finger protein family. Similarly, recombinant Egr1 also showed a similar binding affinity to the ZNF300 binding site 5'-CTGGGGGCG-3'. Bioinformatics analysis revealed that there is an overlapping ZNF300/Egr1 binding site in the human IL-2Rβ promoter region, which was previously known to be recognized by endogenous Egr1. Electrophoretic mobility shift assays showed that endogenous ZNF300 could also bind to this site. A transient transfection assay revealed that both ZNF300 and Egr1 could transactivate the IL-2Rβ promoter, and that the activation was abrogated by a mutation of residues in the overlapping ZNF300/Egr1 binding site. Co-expression of ZNF300 and Egr1 led to enhanced IL-2Rβ promoter activity. Thus, ZNF300 is likely to be another regulator of the human IL-2Rβ promoter.
authors.affiliation: Wuhan University, PR China.
authors.forename: Lu
authors.initials: L
authors.lastname: Xue
authors.forename: Hongling
authors.initials: H
authors.lastname: Qiu
authors.forename: Jian
authors.initials: J
authors.lastname: Ma
authors.forename: Mingxiong
authors.initials: M
authors.lastname: Guo
authors.forename: Wenxin
authors.initials: W
authors.lastname: Li
mesh_terms: D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D051766:Early Growth Response Protein 1 / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D053646:Interleukin-2 Receptor beta Subunit / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D016335:Zinc Fingers / Q000235:genetics
chemical_list: C497325:EGR1 protein, human; D051766:Early Growth Response Protein 1; D053646:Interleukin-2 Receptor beta Subunit; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C485905:ZNF300 protein, human