哺乳动物质子合金属离子输送器的克隆和特征
H Gunshin1, B Mackenzie, U V Berger
1Renal Division, Department of Medicine, Brigham & Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA. hgunshin@rics.bwh.harvard.edu
研究人员在老鼠身上发现了DCT1,一种新的金属离子载体,对于吸收铁和等必需矿物质至关重要. 这一发现揭示了细胞的金属吸收和相关疾病.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 生理学 生理学 生理学
背景情况:
- 金属离子对于许多生物过程至关重要.
- 金属离子的不平衡与遗传性血染色体,缺陷和神经退行性疾病有关.
- 哺乳动物细胞活性金属离子吸收的机制在很大程度上是未知的.
研究的目的:
- 在哺乳动物细胞中识别和描述新型金属离子载体.
- 阐明了活性金属离子吸收背后的分子机制.
- 了解这些载体在金属离子恒温和疾病中的作用.
主要方法:
- 一个新的老鼠金属离子输送器的识别,DCT1.1.
- 描述DCT1的基质特异性和传输机制.
- 根据生理条件对DCT1表达和调节的分析.
主要成果:
- DCT1具有广泛的基质范围,可以运输Fe2+,Zn2+,Mn2+,Co2+,Cd2+,Cu2+,Ni2+和Pb2+.
- DCT1调解了与质子合的,膜电位依赖的活性运输.
- DCT1是一种561氨基酸蛋白质,具有12个跨膜域,无处不在表达,特别是在靠近的十二指肠.
- 由于饮食中的铁缺乏,DCT1的表达被上调,这表明DCT1在肠道铁吸收中起着关键作用.
- DCT1属于Nramp家族,提供了对病原体抵抗机制的洞察力.
结论:
- DCT1 是一种新发现的,在老鼠中广泛的基质特异性金属离子载体.
- DCT1在肠道中对活性金属离子,特别是铁的吸收起着重要作用.
- 了解DCT1的功能,可以了解金属离子恒温,相关疾病和Nramp家族的功能.
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