Asp563 of the horizontal helix of subunit NuoL is involved in proton translocation by the respiratory complex I
Asp563 of the horizontal helix of subunit NuoL is involved in proton translocation by the respiratory complex I
复制标题
NuoL 亚基水平螺旋的 Asp563 参与呼吸复合物 I 的质子易位
DOI:
10.1016/j.febslet.2012.01.056
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发表时间:
2012
期刊:
影响因子:
3.5
通讯作者:
Friedrich
中科院分区:
文献类型:
--
作者:
Steimle;Willistein;Hegger;Janoschke;Erhardt;Friedrich
The NADH:ubiquinone oxidoreductase couples the electron transfer from NADH to ubiquinone with the translocation of protons across the membrane. It contains a 110Å long helix running parallel to the membrane part of the complex. Deletion of the helix resulted in a reduced H+/e−stoichiometry indicating its direct involvement in proton translocation. Here, we show that the mutation of the conserved amino acid D563L, which is part of the horizontal helix of the Escherichia coli complex I, leads to a reduced H+/e−stoichiometry. It is discussed that this residue is involved in transferring protons to the membranous proton translocation site.
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