Stanbrough M, Magasanik B
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.
J Bacteriol. 1996 Apr;178(8):2465-8. doi: 10.1128/jb.178.8.2465-2468.1996.
We present an analysis of the DNA region located upstream of GAP1, the structural gene for the general amino acid permease, which contains the sites required for activation of transcription of this gene in response to the nitrogen source of the growth medium. This gene is not expressed in media containing glutamine, and its transcription is activated in response to Gln3p in cells using glutamate as the source of nitrogen and by Nil1p in cells using urea as the source of nitrogen. We show that full response to both activators requires the presence of two GATAAG sites, as well as the presence of auxiliary sites located in the interval between 602 and 453 bp from the translational start site. The fact that both Gln3p and Nil1p utilize GATAAG sites to activate transcription is reflected in the high homology of the zinc finger regions of the two proteins.
我们对位于通用氨基酸通透酶结构基因GAP1上游的DNA区域进行了分析,该区域包含该基因响应生长培养基氮源而激活转录所需的位点。该基因在含有谷氨酰胺的培养基中不表达,在以谷氨酸为氮源的细胞中其转录由Gln3p激活,在以尿素为氮源的细胞中由Nil1p激活。我们表明,对两种激活剂的完全响应需要存在两个GATAAG位点,以及位于距翻译起始位点602至453 bp区间内的辅助位点。Gln3p和Nil1p都利用GATAAG位点激活转录这一事实反映在这两种蛋白质锌指区域的高度同源性上。