Nucleic Acids Research, 1989, Vol. 17, No. 2 523-537
© 1989
MOLECULAR BIOLOGY |
DNA bending and binding factors of the human ß-actin promoter
Departments of Oncogene Research 31 Yamadaoka, Suita, Osaka 565, Japan 1Experimental Chemotherapy, Research Institute for Microbial Disease, Osaka University 31 Yamadaoka, Suita, Osaka 565, Japan
Received November 9, 1988. Revised December 22, 1988. Accepted December 22, 1988.
Transcription of the B -actin gene is rapidly inducible in response to serum stimulation. To determine the regions responsible for serum inducible and basal level expression, the human B -actin promoter was subjected to mutational analysis-Two distinct elements, the CCAAT homology and the ß-actin specific conserved sequences, were found by a chloramphenicol acetyl trans ferase expression assay and sequence comparisons, and then analyzed for possible functions. Using a DNA bend assay, it was shown that the conserved sequences included the core of a sequence-directed bend of DNA. Gel mobility shift and DNase I protection assays revealed that the conserved sequences and the CCAAT homology were recognized by binding factors in HeLa cell extracts.
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