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.
复制标题
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
中科院分区:
文献类型:
--
作者:
S. Tso;S. Shenoy;B. Quinn;L. Yu
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.
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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
通讯作者:
Gennis,RB
影响因子:
2.9
作者:
Yu,CA;Yu,L
通讯作者:
Yu,L
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Yu,L;Yang,FD;Yu,CA
通讯作者:
Yu,CA
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:
Kriauciunas,A;Yu,L;Yu,CA;Wynn,RM;Knaff,DB
通讯作者:
Knaff,DB
DOI:
--
发表时间:
1992
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Yu,L;Wei,YY;Usui,S;Yu,CA
通讯作者:
Yu,CA