Mutations that modify or exclude binding of the QA ubiquinone and carotenoid in the reaction center from Rhodobacter sphaeroides

Mutations that modify or exclude binding of the QA ubiquinone and carotenoid in the reaction center from Rhodobacter sphaeroides
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修饰或排除球形红杆菌反应中心中 QA 泛醌和类胡萝卜素结合的突变

DOI:
10.1023/a:1006111321083
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发表时间:
2004
影响因子:
3.7
通讯作者:
Michael R. Jones
Michael R. Jones
中科院分区:
生物学3区
文献类型:
--
作者:
J. P. Ridge;M. V. van Brederode;M. G. Goodwin;R. Grondelle;Michael R. Jones

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三个单位点突变已被引入到接近QA泛醌的位置在反应中心从Rhodobacter sphaeroides。这些突变中的两个,Ala M260到Trp和Ala M248到Trp,导致不支持细菌的光合生长的反应中心,并且其中电子转移到QA泛醌被取消。在M260残基处具有Ala至Trp突变的反应中心中,从主要供体至受体细菌脱镁叶绿素的电子转移不受突变的影响,但未观察到从受体细菌脱镁叶绿素至QA的电子转移。这些效应最可能的基础是突变产生了排除QA泛醌结合的结构变化。第三个突变,Leu M215到Trp,产生一个反应中心,具有受损的支持光合生长的能力。该突变改变了QA位点处泛醌结合的性质,并使该位点对醌位点抑制剂如邻菲咯啉敏感。采用类似的方法,其中一个小的残基位于靠近辅因子被改变为一个更庞大的残基,我们表明,反应中心可以呈现类胡萝卜素少的突变Gly M71亮氨酸。
Three single-site mutations have been introduced at positions close to the QA ubiquinone in the reaction centre from Rhodobacter sphaeroides. Two of these mutations, Ala M260 to Trp and Ala M248 to Trp, result in a reaction centre that does not support photosynthetic growth of the bacterium, and in which electron transfer to the QA ubiquinone is abolished. In the reaction centre with an Ala to Trp mutation at the M260 residue, electron transfer from the primary donor to the acceptor bacteriopheophytin is not affected by the mutation, but electron transfer from the acceptor bacteriopheophytin to QA is not observed. The most likely basis for these effects is that the mutation produces a structural change that excludes binding of the QA ubiquinone. A third mutation, Leu M215 to Trp, produces a reaction centre that has an impaired capacity for supporting photosynthetic growth. The mutation changes the nature of ubiquinone binding at the QA site, and renders the site sensitive to quinone site inhibitors such as o- phenanthroline. Adopting a similar approach, in which a small residue located close to a cofactor is changed to a more bulky residue, we show that the reaction centre can be rendered carotenoid-less by the mutation Gly M71 to Leu.
DOI: 10.1021/bi00236a005
发表时间: 1991-06-04
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
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DOI: 10.1016/0005-2728(86)90243-4
发表时间: 1986
期刊: Biochimica et biophysica acta
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期刊: SCIENCE
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发表时间: 1987-08-01
影响因子: 11.1
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发表时间: 1990
期刊: Science (New York, N.Y.)
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