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Sex-specific and non-sex-specific oligomerization domains in both of the doublesex transcription factors from Drosophila melanogaster.

机译:果蝇的双重性转录因子中的性别特异性和非性别特异性寡聚域。

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摘要

The doublesex gene of Drosophila melanogaster encodes the alternatively spliced, sex-specific transcription factors DSXM and DSXF. These factors regulate male- and female-specific transcription of many genes. For example, female-specific transcription of the yolk protein 1 gene is regulated by DSXM repression in males and DSXF activation in females. In this study we used in vitro interaction assays and the in vivo yeast two-hybrid method to identify and examine oligomerization domains of the DSX proteins. A 66-amino-acid segment common to both proteins (amino acids 39 to 104) contains a sequence-specific DNA binding domain and an oligomerization domain (OD1). The OD1 domain oligomerizes up to at least a pentamer, but only dimers bound to a palindromic regulatory site in the yolk protein 1 gene are detected. Both subunits of the OD1 dimer are in contact with DNA. Another segment of each protein (amino acids 350 to 412 for DSXF and 350 to 427 for DSXM) contains a second oligomerization domain (OD2F and OD2M, respectively). The OD2 domains have both sex-specific and non-sex-specific sequences which are necessary for oligomerization. On the basis of sequence analysis, we predict that OD2 oligomerizes through coiled-coil interactions. We speculate that the common function of OD1 and OD2 is to oligomerize the full-length proteins, whereas their specialized functions are to form a dimeric DNA binding unit and a sex-specific transcriptional activation or repression unit.
机译:果蝇的双性基因编码交替剪接的,性别特异性的转录因子DSXM和DSXF。这些因素调节许多基因的男性和女性特异性转录。例如,卵黄蛋白1基因的雌性特异性转录受雄性的DSXM抑制和雌性的DSXF激活调节。在这项研究中,我们使用了体外相互作用测定法和体内酵母双杂交法来鉴定和检查DSX蛋白的寡聚域。两种蛋白质(氨基酸39至104)共有的66个氨基酸区段包含序列特异性DNA结合结构域和寡聚结构域(OD1)。 OD1结构域至少低聚至五聚体,但仅检测到与卵黄蛋白1基因回文调节位点结合的二聚体。 OD1二聚体的两个亚基都与DNA接触。每种蛋白质的另一个片段(DSXF的氨基酸为350至412,DSXM的氨基酸为350至427)包含第二个寡聚域(分别为OD2F和OD2M)。 OD2结构域具有寡聚化所必需的性别特异性和非性别特异性序列。在序列分析的基础上,我们预测OD2通过盘绕线圈相互作用而低聚。我们推测OD1和OD2的共同功能是寡聚全长蛋白,而它们的特殊功能是形成二聚体DNA结合单元和性别特异性转录激活或抑制单元。

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