一种特定于组织的MAR/SARDNA结合蛋白,具有不寻常的结合部位识别能力
L A Dickinson1, T Joh, Y Kohwi
1La Jolla Cancer Research Foundation, California 92037.
Cell
|August 21, 1992
概括
研究人员确定了一种DNA结合蛋白,SATB1,对胆小板发育至关重要. SATB1通过在富含AT的序列中识别改变的糖酸盐骨干来间接结合特定的DNA结构.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 核矩阵/支架关联DNA (MAR/SAR) 在基因组组织中发挥作用.
- 了解DNA结合蛋白对于破译基因调节至关重要.
研究的目的:
- 描述人类DNA结合蛋白SATB1.1.的DNA结合特性.
- 阐明SATB1.1.所识别的特定DNA序列和结构特征.
主要方法:
- 人类cDNA的克隆编码SATB1.1.
- 缺失的核酸实验以确定结合序列.
- 突变分析以评估序列特征的重要性.
- 超螺旋DNA测试以评估解潜力.
- 化学干扰测试以确定结合位置.
主要成果:
- SATB1 主要表达在胸腺中,并结合MARs/SARs.
- SATB1选择性地与具有特定链组成的AT-丰富序列 (ATC序列) 结合.
- 结合取决于DNA在超绕的DNA中形成未配对区域的能力.
- SATB1与小沟相互作用,暗示间接识别DNA结构,而不是直接接触基地.
结论:
- SATB1在富含AT的序列内识别特定的DNA结构变化,而不是直接识别基.
- 结合机制涉及糖酸盐骨干和DNA解潜力.
- SATB1独特的结合性质对其功能至关重要,可能是对胸腺特异性的基因调节.
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