The basal promoter elements of murine cytochrome c oxidase subunit IV gene consist of tandemly duplicated ets motifs that bind to GABP-related transcription factors.
DNA sequences required for expression of the mouse cytochrome c oxidase subunit IV (COXIV) promoter were identified by transient expression of recombinant COXIV-chloramphenicol acetyltransferase constructs in COS and NIH-3T3 cells. Activity of the COXIV promoter is shown to depend upon upstream Sp1 binding sequences and two tandemly repeated 21-base pair sequence elements each mapping to sites of mRNA initiation. Each initiation region repeat contains a binding site for an ets-related transcription factor which demonstrates specificity for the characteristic GGAA ets sequence motif and reactivity with an ets domain-directed monoclonal pan ets antibody. The two 21-base pair repeats are sufficient for transcriptional activity suggesting that the ets-related factor may be involved in both transcriptional activation and start site positioning. The ets-related protein found in COS nuclear extracts is shown to be identical or closely related to the GA-binding protein (GABP) by comparison of electrophoretic mobilities and immunological reactivities of DNA-protein complexes formed with purified recombinant expressed GABP alpha and beta subunits. Sp1 and the GABP-related factors also bind to another mouse cytochrome oxidase subunit gene COXVb. The similar promoter features of these two genes suggests a possible means of coordinate transcriptional regulation among such respiratory proteins.
Carter
R S
RS
Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104.
Bhat
N K
NK
Basu
A
A
Avadhani
N G
NG
D016475:3T3 Cells; D000818:Animals; D001483:Base Sequence; D016466:CHO Cells; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D006224:Cricetinae; D004268:DNA-Binding Proteins / Q000378:metabolism*; D003576:Electron Transport Complex IV / Q000235:genetics* / Q000378:metabolism; D051268:GA-Binding Protein Transcription Factor; D006801:Humans; D046911:Macromolecular Substances; D051379:Mice; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D011401:Promoter Regions, Genetic; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D050783:Proto-Oncogene Proteins c-ets; D011994:Recombinant Proteins / Q000378:metabolism; D015183:Restriction Mapping; D017384:Sequence Deletion; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection
D004268:DNA-Binding Proteins; D051268:GA-Binding Protein Transcription Factor; C495656:Gabpa protein, mouse; C495658:Gabpb1 protein, mouse; D046911:Macromolecular Substances; D009838:Oligodeoxyribonucleotides; D011518:Proto-Oncogene Proteins; D050783:Proto-Oncogene Proteins c-ets; D011994:Recombinant Proteins; D014157:Transcription Factors; D003576:Electron Transport Complex IV; D015500:Chloramphenicol O-Acetyltransferase