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Characterization of the human interleukin-2 receptor beta-chain gene promoter: regulation of promoter activity by ets gene products. 总被引:2,自引:2,他引:0 下载免费PDF全文
J X Lin N K Bhat S John W S Queale W J Leonard 《Molecular and cellular biology》1993,13(10):6201-6210
The interleukin-2 receptor (IL-2R) beta chain (IL-2R beta) is an essential signaling component of high- and intermediate-affinity IL-2Rs. Our laboratory previously reported that a DNA fragment containing 857 bp of 5'-flanking sequence of the human IL-2R beta gene exhibited promoter activity. We have now further characterized the promoter and delineated cis-acting regulatory regions. The region downstream of -363 is critical for basal and phorbol myristate acetate-inducible IL-2R beta promoter activity and contains at least three enhancer-like regions. Among them, the -56 to -34 enhancer was the most potent and had high-level activity in two T-cell lines but not in nonlymphoid HeLaS3 and MG63 cells. This enhancer contains a GGAA Ets binding site which bound two Ets family proteins, Ets-1 and GA-binding protein in vitro. Mutation of the Ets motif strongly diminished both promoter and enhancer activities. We conclude that this Ets binding site plays a key role in regulating basal and phorbol myristate acetate-inducible IL-2R beta promoter activity and may also contribute to tissue-specific expression of the IL-2R beta gene. 相似文献
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Tanaka H Kamita SG Wolf NM Harris TR Wu Z Morisseau C Hammock BD 《Biochimica et biophysica acta》2008,1779(1):17-27
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