Structural insights into cGAMP degradation by Ecto-nucleotide pyrophosphatase phosphodiesterase 1.

Structural insights into cGAMP degradation by Ecto-nucleotide pyrophosphatase phosphodiesterase 1.
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DOI:
10.1038/s41467-018-06922-7
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发表时间:
2018-10-24
影响因子:
16.6
通讯作者:
Nureki O
Nureki O
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kato K;Nishimasu H;Oikawa D;Hirano S;Hirano H;Kasuya G;Ishitani R;Tokunaga F;Nureki O

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ENPP 1(外核苷酸焦磷酸酶磷酸二酯酶1),一种II型跨膜糖蛋白,水解ATP产生AMP和二磷酸,从而抑制骨矿化。最近的一项研究表明,ENPP 1也优先水解2′3′-cGAMP(环GMP-AMP),但不水解其连接异构体3′3′-cGAMP,并负调节先天免疫系统中的cGAS-STING途径。在这里,我们提出了高分辨率的晶体结构的ENPP 1与3′3′-cGAMP和反应中间体PA(3′,5 ′)PG的复合物。结构显示,腺嘌呤和鸟嘌呤碱基的二核苷酸被识别的核苷酸和鸟嘌呤口袋,分别。此外,结构表明2 '3'-cGAMP(而不是3 '3'-cGAMP)以适合催化的构象与活性位点结合,从而解释了ENPP 1对2 '3'-cGAMP的特异性降解。我们的研究结果为ENPP 1如何水解ATP和cGAMP参与两个不同的生物过程提供了见解。外核苷酸焦磷酸酶磷酸二酯酶1(ENPP 1)是一种II型跨膜糖蛋白,可水解ATP和cGAMP。在此,作者展示了小鼠ENPP 1的胞外结构域与3′3′-cGAMP和反应中间体pA(3′,5 ′)pG复合的晶体结构,并讨论了其机理。
ENPP1 (Ecto-nucleotide pyrophosphatase phosphodiesterase 1), a type II transmembrane glycoprotein, hydrolyzes ATP to produce AMP and diphosphate, thereby inhibiting bone mineralization. A recent study showed that ENPP1 also preferentially hydrolyzes 2′3′-cGAMP (cyclic GMP-AMP) but not its linkage isomer 3′3′-cGAMP, and negatively regulates the cGAS-STING pathway in the innate immune system. Here, we present the high-resolution crystal structures of ENPP1 in complex with 3′3′-cGAMP and the reaction intermediate pA(3′,5′)pG. The structures revealed that the adenine and guanine bases of the dinucleotides are recognized by nucleotide- and guanine-pockets, respectively. Furthermore, the structures indicate that 2′3′-cGAMP, but not 3′3′-cGAMP, binds to the active site in a conformation suitable for catalysis, thereby explaining the specific degradation of 2′3′-cGAMP by ENPP1. Our findings provide insights into how ENPP1 hydrolyzes both ATP and cGAMP to participate in the two distinct biological processes. Ecto-nucleotide pyrophosphatase phosphodiesterase 1 (ENPP1) is a type II transmembrane glycoprotein that hydrolyzes both ATP and cGAMP. Here the authors present the crystal structures of the extracellular domain of mouse ENPP1 in complex with 3′3′-cGAMP and the reaction intermediate pA(3′,5′)pG and discuss mechanistic implications.
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发表时间: 2013-09-20
期刊: Science (New York, N.Y.)
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发表时间: 2010-02
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