Human 14-3-3 Proteins Site-selectively Bind the Mutational Hotspot Region of SARS-CoV-2 Nucleoprotein Modulating its Phosphoregulation.

Human 14-3-3 Proteins Site-selectively Bind the Mutational Hotspot Region of SARS-CoV-2 Nucleoprotein Modulating its Phosphoregulation.
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DOI:
10.1016/j.jmb.2022.167891
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发表时间:
2023-01-30
影响因子:
5.6
通讯作者:
Sluchanko, Nikolai N.
Sluchanko, Nikolai N.
中科院分区:
生物学2区
文献类型:
--
作者:
Tugaeva, Kristina, V;Sysoev, Andrey A.;Kapitonova, Anna A.;Smith, Jake L. R.;Zhu, Phillip;Cooley, Richard B.;Antson, Alfred A.;Sluchanko, Nikolai N.

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SARS-CoV-2核蛋白的磷酸化募集人胞质14-3-3蛋白,其在许多病毒的复制中发挥公认的作用。在这里,我们使用遗传密码扩展来证明14-3-3结合是由SARS-CoV-2核蛋白在以Ser 197和Thr 205为中心的两个伪重复序列中的任一个上的磷酸化触发的。根据荧光各向异性测量,pT 205-基序,存在于SARS-CoV-2,但不存在于SARS-CoV,是优于pS197-基序的所有七个人14-3-3亚型,共同显示出一个不可预见的pT 205/pS197肽结合选择性层次。晶体结构表明,pS197和pT 205是相互排斥的14-3-3-结合位点,而SAXS和生物化学数据上获得的完整的蛋白质-蛋白质复合物表明,14-3-3结合闭塞的Ser/Arg-丰富的区域的核蛋白,抑制其去磷酸化。这个富含Ser/Arg的区域非常容易发生突变,例如Omicron和Delta变体,我们的数据表明14-3-3/核蛋白相互作用的强度可以与病毒的复制适应性相关联。
Phosphorylation of SARS-CoV-2 nucleoprotein recruits human cytosolic 14-3-3 proteins playing a well-recognized role in replication of many viruses. Here we use genetic code expansion to demonstrate that 14-3-3 binding is triggered by phosphorylation of SARS-CoV-2 nucleoprotein at either of two pseudo-repeats centered at Ser197 and Thr205. According to fluorescence anisotropy measurements, the pT205-motif, present in SARS-CoV-2 but not in SARS-CoV, is preferred over the pS197-motif by all seven human 14-3-3 isoforms, which collectively display an unforeseen pT205/pS197 peptide binding selectivity hierarchy. Crystal structures demonstrate that pS197 and pT205 are mutually exclusive 14-3-3-binding sites, whereas SAXS and biochemical data obtained on the full protein-protein complex indicate that 14-3-3 binding occludes the Ser/Arg-rich region of the nucleoprotein, inhibiting its dephosphorylation. This Ser/Arg-rich region is highly prone to mutations, as exemplified by the Omicron and Delta variants, with our data suggesting that the strength of 14-3-3/nucleoprotein interaction can be linked with the replicative fitness of the virus.
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