Functional analysis of the conserved hydrophobic gate region of the magnesium transporter CorA.

Functional analysis of the conserved hydrophobic gate region of the magnesium transporter CorA.
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DOI:
10.1016/j.bbamem.2010.10.017
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发表时间:
2011-06
影响因子:
3.4
通讯作者:
Djinovic-Carugo, Kristina
Djinovic-Carugo, Kristina
中科院分区:
生物学3区
文献类型:
--
作者:
Svidova, Soria;Sponder, Gerhard;Schweyen, Rudolf J.;Djinovic-Carugo, Kristina

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海洋热藻细胞质颈部的Leu294残基被认为是Mg2+运输的主要门户。我们在这个位置创建了三个位点导向突变体:在Leu294Asp和Leu294Gly突变体中,我们观察到孔关闭缺陷,而在Leu294Arg突变体中,不仅门控,而且对Mg2+摄取的调节也受到影响。我们的研究结果证实了Leu294对Mg2+输运的门控作用,并揭示了氨基酸残基的电荷和结构特征对门控机制的影响。Mg2+转运体CorA离子门的突变研究。Leu294与带正电残基交换对CorA (Leu294Arg突变体)门控的影响。Leu294与带负电残基交换对CorA (Leu294Asp突变体)门控的影响。去除294位侧链对CorA (Leu294Gly突变体)门控的影响。
The Leu294 residue in the cytoplasmic neck of Thermotoga maritima CorA is considered to be the main gate for Mg2+ transport. We created three site-directed mutants at this position: in the Leu294Asp and Leu294Gly mutants we observed a defect in closing of the pore, while in the Leu294Arg mutant not only gating, but also the regulation of Mg2+ uptake was affected. Our results confirmed the importance of the Leu294 for gating of Mg2+ transport and in addition revealed the influence of the charge and structural features of the amino acid residues on the gating mechanism. ► Mutational study of the ion gate of Mg2+ transporter CorA. ► Effect of exchange of Leu294 with a positively charged residue on gating of CorA (Leu294Arg mutant). ► Effect of exchange of Leu294 with a negatively charged residue on gating of CorA (Leu294Asp mutant). ► Effect of removal of side chain at position 294 on gating of CorA (Leu294Gly mutant).
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