Characterization of zinc-substituted cytochrome c by circular dichroism and resonance Raman spectroscopic methods.

Characterization of zinc-substituted cytochrome c by circular dichroism and resonance Raman spectroscopic methods.
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通过圆二色性和共振拉曼光谱方法表征锌取代的细胞色素 c。

DOI:
10.1016/s0162-0134(97)00001-9
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发表时间:
1997
影响因子:
3.9
通讯作者:
Kostić,NM
Kostić,NM
中科院分区:
生物学2区
文献类型:
--
作者:
Ye,S;Shen,C;Cotton,TM;Kostić,NM

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铁(III)在细胞色素c中被替换为锌(II)通过修改的方法公布的其他人,并在完整的详细描述的程序。三种形式的细胞色素c-那些含有铁(III),铁(II),和锌(II)-的圆二色性光谱和共振拉曼光谱检查。这两种光谱表明,锌(II)离子的引入不会明显改变细胞色素c的整体结构和构象。共振拉曼光谱表明卟啉“核心”的大小与六配位不一致,与五配位一致。不像铁(III)和铁(II)离子,这是绑定到两个轴向配体(His 18和Met 80),锌(II)离子在细胞色素c似乎是绑定到只有一个,最有可能是His 18。有关轴向协调问题的证据进行了讨论。
Iron(III) in cytochrome c is replaced with zinc(II) by a modification of a method published by others, and the procedure is described in full detail. Three forms of cytochrome c—those containing iron(III), iron(II), and zinc(II)—are examined by circular dichroism spectroscopy and resonance Raman spectroscopy. Spectra of both kinds show that introduction of zinc(II) ions does not appreciably alter the overall structure and conformation of cytochrome c. Resonance Raman spectra indicate the size of the porphyrin “core” that is inconsistent with six-coordination and consistent with five-coordination. Unlike the iron(III) and iron(II) ions, which are bound to two axial ligands (His 18 and Met 80), the zinc(II) ion in cytochrome c seems to be bound to only one, most probably His 18. Evidence pertaining to the question of axial coordination is discussed.
DOI: 10.1016/0014-5793(81)81002-2
发表时间: 1981-01-01
期刊: FEBS LETTERS
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