Crystal structure of human tyrosylprotein sulfotransferase-2 reveals the mechanism of protein tyrosine sulfation reaction.

Crystal structure of human tyrosylprotein sulfotransferase-2 reveals the mechanism of protein tyrosine sulfation reaction.
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人类酪氨酸蛋白磺基转移酶-2 的晶体结构揭示了蛋白酪氨酸硫酸化反应的机理。

DOI:
10.1038/ncomms2593
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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翻译后酪氨酸硫酸化修饰蛋白在细胞外蛋白-蛋白相互作用中起着重要作用。蛋白质酪氨酸硫化反应是由高尔基酶酪氨酸蛋白硫转移酶(TPST)催化的。到目前为止,TPST还没有晶体结构。因此,蛋白质酪氨酸硫酸化反应的具体机理尚不清楚。在这里,我们以1.9Å分辨率展示了人类TPST异构体2 (TPST2)与从补体C4和3 ' -磷酸腺苷-5 ' -磷酸(PAP)衍生的底物肽(C4P5Y3)络合的第一个晶体结构。结构和互补突变分析揭示了催化的分子基础是类似sn2的在线位移机制。TPST2似乎通过短的平行β-片型相互作用识别深间隙中的C4肽,结合的C4P5Y3形成l形结构。令人惊讶的是,在TPST2结构中观察到的底物肽识别模式与受体型酪氨酸激酶相似。
Post-translational protein modification by tyrosine-sulfation plays an important role in extracellular protein-protein interactions. The protein tyrosine sulfation reaction is catalyzed by the Golgi-enzyme called the tyrosylprotein sulfotransferase (TPST). To date, no crystal structure is available for TPST. Detailed mechanism of protein tyrosine sulfation reaction has thus remained unclear. Here we present the first crystal structure of the human TPST isoform 2 (TPST2) complexed with a substrate peptide (C4P5Y3) derived from complement C4 and 3’-phosphoadenosine-5’-phosphate (PAP) at 1.9Å resolution. Structural and complementary mutational analyses revealed the molecular basis for catalysis being an SN2-like in-line displacement mechanism. TPST2 appeared to recognize the C4 peptide in a deep cleft by using a short parallel β-sheet type interaction, and the bound C4P5Y3 forms an L-shaped structure. Surprisingly, the mode of substrate peptide recognition observed in the TPST2 structure resembles that observed for the receptor type tyrosine kinases.
DOI: 10.1107/s0907444904019158
发表时间: 2004-12-01
影响因子: 2.2
作者:
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通讯作者: Cowtan, K
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发表时间: 2009-05-01
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影响因子: 4.8
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DOI: 10.1021/bi900285c
发表时间: 2009-06-16
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Jen, Connie H.;Moore, Kevin L.;Leary, Julie A.
通讯作者: Leary, Julie A.