Regulation of tankyrase activity by a catalytic domain dimer interface.

Regulation of tankyrase activity by a catalytic domain dimer interface.
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DOI:
10.1016/j.bbrc.2018.07.113
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发表时间:
2018-09-10
影响因子:
3.1
通讯作者:
Zhang X
Zhang X
中科院分区:
生物学4区
文献类型:
--
作者:
Fan C;Yarravarapu N;Chen H;Kulak O;Dasari P;Herbert J;Yamaguchi K;Lum L;Zhang X

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端锚聚合酶(TNKS和TNKS 2)是催化其靶蛋白的聚ADP核糖基化(PAR基化)的酶。端锚聚合酶介导的PAR基化在细胞信号传导中起关键的调节作用,特别是在Wnt/β-连环蛋白途径中。端锚聚合酶中的不育α基序(SAM)结构域介导其寡聚化,这对于端锚聚合酶功能是必需的。寡聚化调节端锚聚合酶的催化活性,但其潜在机制尚不清楚。我们的端锚聚合酶催化结构域的晶体结构的分析表明,头对头二聚体的形成调节催化活性。我们的活性测定表明,在催化结构域二聚体界面的残基是重要的端锚聚合酶在溶液和细胞中的PAR基化活性。二聚体是弱的,并且可能仅在端锚聚合酶的SAM结构域介导的寡聚体的背景下形成,这与端锚聚合酶活性对SAM结构域的依赖性一致。
Tankyrases (TNKS and TNKS2) are enzymes that catalyze poly-ADP-ribosylation (PARsylation) of their target proteins. Tankyrase-mediated PARsylation plays critical regulatory roles in cell signaling, particularly in the Wnt/β-catenin pathway. The sterile alpha motif (SAM) domain in tankyrases mediates their oligomerization, which is essential for tankyrase function. The oligomerization regulates the catalytic activity of tankyrases, but the underlying mechanism is unclear. Our analyses of crystal structures of the tankyrase catalytic domain suggest that formation of a head-to-head dimer regulates the catalytic activity. Our activity assays show that residues in the catalytic domain dimer interface are important for the PARsylation activity of tankyrases both in solution and cells. The dimer is weak and may only form in the context of the SAM domain-mediated oligomers of tankyrases, consistent with the dependence of the tankyrase activity on the SAM domain.
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