Nucleic Acids Research, 1989, Vol. 17, No. 16 6651-6667
© 1989
MOLECULAR BIOLOGY |
Rat gene 33: analysis of its structure, messenger RNA and basal promoter activity
Department of Molecular Physiology and Biophysics, Vanderbilt University Medical School Nashville, TN 37232, USA
Received June 1, 1989. Revised July 21, 1989. Accepted July 21, 1989.
Several overlapping cDNA and genomic DNA clones corresponding to mRNAg33 and gene 33, respectively, vere isolated and characterized. The mRNAg33 molecule is 2971 nt in length, exclusive of a poly(A+) tail, and encodes a putative 459 anino acid protein (49,946 daltons). The 13.2 Icbp gene consists of four exons, three introns, and has two initiation sites located 27 and 30 bp downstream from a TATA box.
Transfection of H4IIE cells with a fusion gene 33 (1900 to +32)/lucifer-ase construct (pSL330A) gave rise to readily detectable luciferase activity. In addition, primer extension analysis of the gene 33/luciferase dRNA transcribed in these experioents showed that transcription initiates in the gene 33 DNA at two sites consistent with those found in vivo. Analysis of the effect of 5' deletions on basal promoter activity showed that, in relation to the promoter activity of pSL330A, 40X of the activity is lost between 1643 and 1050, another 40X between 550 and 475, and deletion to 55 causes a total loss of detectable luciferase activity.
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