Crystal and EM structures of human phosphoribosyl pyrophosphate synthase I (PRS1) provide novel insights into the disease-associated mutations.

Crystal and EM structures of human phosphoribosyl pyrophosphate synthase I (PRS1) provide novel insights into the disease-associated mutations.
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人磷酸核糖焦磷酸合酶 I (PRS1) 的晶体和电镜结构为疾病相关突变提供了新的见解。

DOI:
10.1371/journal.pone.0120304
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Li X
Li X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chen P;Liu Z;Wang X;Peng J;Sun Q;Li J;Wang M;Niu L;Zhang Z;Cai G;Teng M;Li X

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人类PRS1基因是核苷酸、脱氧核苷酸及其衍生物生物合成过程中不可缺少的基因,由于其单碱基突变,与多种人类疾病直接相关。然而,这些突变的影响的分子理解是阻碍了缺乏了解其催化机制。在这里,我们重建了PRS 1 apo状态的3D EM结构。结合AMPNPP、AMPNPP和R5P、ADP的天然染色电镜结构以及具有不同构象的载脂蛋白状态,我们认为六聚体是酶活性形式。基于晶体结构、序列分析、突变、酶动力学分析和分子动力学模拟,我们揭示了保守的底物结合基序,并对所有致病突变体进行了进一步的分析。
Human PRS1, which is indispensable for the biosynthesis of nucleotides, deoxynucleotides and their derivatives, is associated directly with multiple human diseases because of single base mutation. However, a molecular understanding of the effect of these mutations is hampered by the lack of understanding of its catalytic mechanism. Here, we reconstruct the 3D EM structure of the PRS1 apo state. Together with the native stain EM structures of AMPNPP, AMPNPP and R5P, ADP and the apo states with distinct conformations, we suggest the hexamer is the enzymatically active form. Based on crystal structures, sequence analysis, mutagenesis, enzyme kinetics assays, and MD simulations, we reveal the conserved substrates binding motifs and make further analysis of all pathogenic mutants.
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