A high-resolution structure of the EF-hand domain of human polycystin-2.

A high-resolution structure of the EF-hand domain of human polycystin-2.
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DOI:
10.1002/pro.2513
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发表时间:
2014-09
期刊:
影响因子:
8
通讯作者:
Bycroft, Mark
Bycroft, Mark
中科院分区:
生物学3区
文献类型:
--
作者:
Allen, Mark D.;Qamar, Seema;Vadivelu, Murali K.;Sandford, Richard N.;Bycroft, Mark

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常染色体显性遗传性多囊肾病(ADPKD)影响超过1:1000的全球人口,由PKD 1和PKD 2两个基因突变引起。PKD 2编码968个氨基酸的跨膜蛋白,多囊蛋白-2(PC-2),其是TRP离子通道家族的成员。C-末端胞质尾含有EF-手基序,随后是短卷曲螺旋结构域。我们已经确定了使用NMR光谱的PC-2的EF-手区域的结构。使用不同的边界,与以前的研究中使用的相比,使我们能够确定一个高分辨率的结构,并表明EF手图案形成一个标准的钙结合口袋。已经测量了该口袋对钙的亲和力,并且已经产生了降低和增加其对金属离子的亲和力的突变体。
Autosomal dominant polycystic kidney disease (ADPKD) affects over 1:1000 of the worldwide population and is caused by mutations in two genes, PKD1 and PKD2. PKD2 encodes a 968-amino acid membrane spanning protein, Polycystin-2 (PC-2), which is a member of the TRP ion channel family. The C-terminal cytoplasmic tail contains an EF-hand motif followed by a short coiled-coil domain. We have determined the structure of the EF-hand region of PC-2 using NMR spectroscopy. The use of different boundaries, compared with those used in previous studies, have enabled us to determine a high resolution structure and show that the EF hand motif forms a standard calcium-binding pocket. The affinity of this pocket for calcium has been measured and mutants that both decrease and increase its affinity for the metal ion have been created.
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