Identification of factors that interact with the E1A-inducible adenovirus E3 promoter
- PMID: 2828166
- DOI: 10.1101/gad.1.10.1132
Identification of factors that interact with the E1A-inducible adenovirus E3 promoter
Abstract
We have investigated the E1A-inducible E3 promoter of adenovirus type 5 with respect to its ability to bind specific nuclear proteins. Four distinct nucleoprotein-binding sites were detected, located between positions-7 to -33, -44 to -68, -81 to -103, and -154 to -183, relative to the E3 cap site. These sites contain sequences previously shown to be functionally important for efficient E3 transcription. No major qualitative or quantitative differences were found in the binding pattern between nucleoprotein extracts prepared from uninfected or adenovirus-infected HeLa cells. Competition experiments suggest that the factors binding to the -154 to -183 and -81 to -103 sites are the previously identified nucleoproteins, NF1 and AP1, respectively. The factor binding to the -44 to -68 site, which we term ATF, also interacts with other E1A-inducible promoters and is very similar and probably identical to the factor that binds to the cAMP-responsive element of somatostatin. We have purified this factor, which is a protein of 43 kD in size.
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