Cytochrome b558, a component of the phagocyte NADPH oxidase, is a flavoprotein.

Cytochrome b558, a component of the phagocyte NADPH oxidase, is a flavoprotein.
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细胞色素 b558 是吞噬细胞 NADPH 氧化酶的组成部分,是一种黄素蛋白。

DOI:
10.1016/s0006-291x(05)81557-8
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发表时间:
1992
影响因子:
3.1
通讯作者:
S. Minakami
S. Minakami
中科院分区:
生物学4区
文献类型:
--
作者:
H. Sumimoto;N. Sakamoto;M. Nozaki;Y. Sakaki;K. Takeshige;S. Minakami

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细胞色素b 558是吞噬细胞O2−NADPH氧化酶的唯一膜成分。通过在体外用粗膜组分重组的氧化酶产生的O2−通过添加FAD而增强数倍,而部分纯化的细胞色素完全依赖于外源FAD,这表明FAD通过膜组分细胞色素b 558起作用。细胞色素大亚基(gp 91-phox)的氨基酸序列与先前表征的黄素蛋白的氨基酸序列的比对显示,gp 91-phox的中间和C-末端部分可能分别是FAD和NADPH结合结构域。因此,Cytochromeb 558似乎是一种具有NADPH氧化酶的NADPH结合位点的黄素蛋白。
Cytochromeb558is the only membrane component of the phagocyte O2−NADPH oxidase. The O2−production by the oxidase reconstitutedin vitrowith the crude membrane fraction is enhanced several-fold by addition of FAD, whereas that with the partially purified cytochrome is completely dependent on exogenous FAD, suggesting that FAD acts through the membrane component, cytochromeb558. The alignments of the amino acid sequence of the large subunit of the cytochrome (gp91-phox) with those of previously characterized flavoproteins reveal that the middle and C-terminal portions of gp91-phoxare likely to be FAD- and NADPHbinding domains, respectively. Cytochromeb558, thus, appears to be a flavoprotein with an NADPH-binding site, of the NADPH oxidase.
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影响因子: 2.9
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