概括
研究人员克隆了人类低密度脂蛋白 (LDL) 受体基因,确定了五个不同的蛋白质域. 在用克隆DNA感染猿类细胞后表达了功能性细胞表面受体.
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:
- 低密度脂蛋白 (LDL) 受体在胆固醇代谢中起着至关重要的作用.
- 了解LDL受体的结构和功能对于解决高胆固醇血症至关重要.
研究的目的:
- 为了确定人类LDL受体cDNA的核酸序列.
- 阐明LDL受体蛋白的结构域和功能区域.
- 为了证明人类LDL受体在异质系统中的功能表达.
主要方法:
- 为人类的LDL受体克隆5.3千基cDNA.
- 核酸测序和氨基酸序列分析.
- 猿类COS细胞与人类LDL受体cDNA和SV40早期促进体的感染.
主要成果:
- 人类的LDL受体蛋白 (839个氨基酸) 包含五个不同的域:一个具有潜在的LDL结合重复的N端囊丰富的域,一个EGF前体同质域,一个O链 glycosylation 位点,一个跨膜域和一个C端细胞质域.
- 该mRNA包含一个大3'未翻译区域与重复的DNA元素 (Alu家族).
- 功能性细胞表面的LDL受体在被感染的猿类COS细胞中成功地表达.
结论:
- 已识别的域为LDL受体的结构,功能和膜局部提供了洞察力.
- 功能性受体的成功表达验证了克隆的cDNA,并为进一步研究提供了一个模型.
- 这项研究为了解与LDL受体相关的遗传疾病提供了基础.
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