Distinct classes of transcriptional activating domains function by different mechanisms.
We have previously shown that the two transcriptional activation functions (TAF-1 and TAF-2) of the human estrogen receptor (hER) have synergistic properties different from one another and from those of acidic activating domains (AADs). Here we compare the transcriptional interference/squelching properties of the hER TAFs with those of the AADs of yeast GAL4 and chimeric GAL-VP16 activators. Our results indicate that AADs interact with a factor(s) that, while required for activation by AADs, is not essential for activation by hER TAFs. In contrast, hER TAFs appear to interact with factors indispensable for mediating both their activation function and that of AADs. Thus, different classes of trans-activators may interact with different factors. In addition, the synergistic and transcriptional interference/squelching properties of the two TAFs of the human glucocorticoid receptor (hGR) indicate that both are composed of acidic and nonacidic activation functions.
Tasset
D
D
Laboratoire de Génétique Moléculaire des Eucaryotes du CNRS, Strasbourg, France.
Tora
L
L
Fromental
C
C
Scheer
E
E
Chambon
P
P
D001483:Base Sequence; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D010957:Plasmids; D011401:Promoter Regions, Genetic; D011960:Receptors, Estrogen / Q000378:metabolism*; D011965:Receptors, Glucocorticoid / Q000378:metabolism*; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D015345:Oligonucleotide Probes; D011960:Receptors, Estrogen; D011965:Receptors, Glucocorticoid; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors