Subunit IV of cytochrome bc1 complex from Rhodobacter sphaeroides. Localization of regions essential for interaction with the three-subunit core complex.

Subunit IV of cytochrome bc1 complex from Rhodobacter sphaeroides. Localization of regions essential for interaction with the three-subunit core complex.
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来自球形红杆菌的细胞色素 bc1 复合物的亚基 IV。

DOI:
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发表时间:
2000
影响因子:
4.8
通讯作者:
L. Yu
L. Yu
中科院分区:
生物学2区
文献类型:
--
作者:
S. Tso;S. Shenoy;B. Quinn;L. Yu

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生成并表征了重组亚基 IV 突变体,该突变体识别了球形红细菌三亚基核心复合物恢复 bc(1) 活性所必需的区域。四种 C 端截短突变体:IV(1-109)、IV(1-85)、IV(1-76) 和 IV(1-40) 具有野生型 IV 的 100%、0%、0% 和 0% 的重建活性,表明残基 86-109 是必需的。 IV(1-109) 以与野生型 IV 相同的方式与核心复合物结合,而突变体 IV(1-85)、IV(1-76) 和 IV(1-40) 不与核心复合物结合,表明亚基 IV 需要其跨膜螺旋区域(残基 86-109)才能组装成 bc(1) 复合物。由于 GST-IV(86-109) 融合蛋白几乎没有重建活性,因此在亚基 IV 通过跨膜螺旋掺入复合物后(可能是通过与核心复合物中的细胞色素 b 相互作用),需要残基 1-85 中的某些区域来恢复 bc(1) 活性。相互作用区域被鉴定为残基 41-53 和 77-85,因为突变体 IV(21-109)、IV(41-109)、IV(54-109) 和 IV(77-109) 具有野生型 IV 的 95%、98%、53% 和 53% 的重建活性。这两个相互作用的区域位于色素细胞膜的细胞质侧,并分别靠近细胞色素b的DE环和螺旋G。
Recombinant subunit IV mutants which identify the regions essential for restoration of bc(1) activity to the three-subunit core complex of Rhodobacter sphaeroides were generated and characterized. Four C-terminal truncated mutants: IV(1-109), IV(1-85), IV(1-76), and IV(1-40) had 100, 0, 0, and 0% of reconstitutive activity of the wild-type IV, indicating that residues 86-109 are essential. IV(1-109) is associated with the core complex in the same manner as the wild-type IV while mutants IV(1-85), IV(1-76), and IV(1-40) do not associate with the core complex, indicating that subunit IV requires its transmembrane helix region (residues 86-109) for assembly into the bc(1) complex. Since GST-IV(86-109) fusion protein has little reconstitutive activity, some region(s) in residues 1-85 are required for bc(1) activity restoration after subunit IV is incorporated into the complex through the transmembrane helix, presumably by interaction with cytochrome b in the core complex. The interacting regions are identified as residues 41-53 and 77-85, since mutants IV(21-109), IV(41-109), IV(54-109), and IV(77-109) had 95, 98, 53, and 53% of the reconstitutive activity of the wild-type IV. These two interacting regions are on the cytoplasmic side of the chromatophore membrane and closed to the DE loop and helix G of cytochrome b, respectively.
DOI: 10.1111/j.1432-1033.1990.tb15633.x
发表时间: 1990
期刊: European journal of biochemistry
影响因子: --
作者:
Yun,CH;Beci,R;Crofts,AR;Kaplan,S;Gennis,RB
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DOI: --
发表时间: 1985
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影响因子: --
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DOI: 10.1016/s0005-2728(89)80190-2
发表时间: 1989
期刊: Biochimica et biophysica acta
影响因子: --
作者:
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DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Yu,CA