Acetylation and modulation of erythroid Krüppel-like factor (EKLF) activity by interaction with histone acetyltransferases.
Erythroid Krüppel-like factor (EKLF) is a red cell-specific transcriptional activator that is crucial for consolidating the switch to high levels of adult beta-globin expression during erythroid ontogeny. EKLF is required for integrity of the chromatin structure at the beta-like globin locus, and it interacts with a positive-acting factor in vivo. We find that EKLF is an acetylated transcription factor, and that it interacts in vivo with CBP, p300, and P/CAF. However, its interactions with these histone acetyltransferases are not equivalent, as CBP and p300, but not P/CAF, utilize EKLF as a substrate for in vitro acetylation within its trans-activation region. The functional effects of these interactions are that CBP and p300, but not P/CAF, enhance EKLF's transcriptional activation of the beta-globin promoter in erythroid cells. These results establish EKLF as a tissue-specific transcription factor that undergoes post-translational acetylation and suggest a mechanism by which EKLF is able to alter chromatin structure and induce beta-globin expression within the beta-like globin cluster.
Zhang
W
W
Brookdale Center for Molecular Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.
Bieker
J J
JJ
D000107:Acetylation; D000123:Acetyltransferases / Q000378:metabolism*; D000328:Adult; D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D050882:CREB-Binding Protein; D002460:Cell Line; D017931:DNA Primers / Q000235:genetics; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism; D004920:Erythropoiesis; D018507:Gene Expression Regulation, Developmental; D005914:Globins / Q000235:genetics; D051548:Histone Acetyltransferases; D006801:Humans; D066298:In Vitro Techniques; D051741:Kruppel-Like Transcription Factors; D009687:Nuclear Proteins / Q000378:metabolism; D011401:Promoter Regions, Genetic; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015533:Transcriptional Activation; D014162:Transfection
D017931:DNA Primers; D004268:DNA-Binding Proteins; D051741:Kruppel-Like Transcription Factors; D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C080774:erythroid Kruppel-like factor; D005914:Globins; D000123:Acetyltransferases; D050882:CREB-Binding Protein; C494363:CREBBP protein, human; D051548:Histone Acetyltransferases