结合 (III) 形成混合的Cr (III),Fe (III) 血清转移素
Dylan R Graham1, Eilidh Drummond1, Marlena Barrido1
1Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, AL, 35487-0336, USA.
Biological trace element research
|November 9, 2023
概括
转素 (Tf) 可能会在血液中携带 (Cr(III)) 与铁 (Fe(III)) 结合. 这项研究表明,单铁基Tf快速结合一个Cr (III) 形成混合Cr (III),Fe (III) -Tf,表明其运输形式.
科学领域:
- 生物化学 生物化学
- 金属蛋白的研究研究.
- 微量元素的运输方式
背景情况:
- 转素 (Tf) 是血液中主要的铁 (Fe (III)) 运输物.
- Tf还参与了 (Cr(III)) 的运输.
- 在血液中占主导地位的Tf形式是单铁Tf (Fe(III) -Tf).
研究的目的:
- 为了研究Cr (III) 与单铁Tf的结合.
- 为了描述混合Cr (III),Fe (III) -Tf的形成.
- 通过Tf.阐明Cr(III) 通过Tf.的运输机制.
主要方法:
- 在生理条件下 (HEPES/二碳酸盐缓冲体,pH 7.4) 研究了Cr (III) 与单铁基Tf的结合.
- 使用Cr (III) 定位来分析结合亲和力和固化计.
- 在Cr (III) 结合时观察到Tf的形状变化.
主要成果:
- 单铁基Tf迅速将一个相当于Cr{III}的Cr{III}结合到其开放的金属结合部位.
- 这种结合很紧,形成混合的Cr,III,Fe,III-Tf.
- 在Cr (III) 结合时的形状变化类似于在apoTf结合两个Cr (III) 离子时看到的变化.
结论:
- 单铁基Tf有效地结合了CrIII,形成混合的CrIII,FeIII-Tf.
- 混合Cr (III),Fe (III) -Tf可能是Tf运输的Cr (III) 的主要形式.
- 这项研究为运输动态提供了新的见解.
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