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10.1371/journal.pgen.1005367

http://scihub22266oqcxt.onion/10.1371/journal.pgen.1005367
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suck abstract from ncbi


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pmid26134849      PLoS+Genet 2015 ; 11 (7): ä
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  • SAMHD1 Inhibits LINE-1 Retrotransposition by Promoting Stress Granule Formation #MMPMID26134849
  • Hu S; Li J; Xu F; Mei S; Le Duff Y; Yin L; Pang X; Cen S; Jin Q; Liang C; Guo F
  • PLoS Genet 2015[Jul]; 11 (7): ä PMID26134849show ga
  • The SAM domain and HD domain containing protein 1 (SAMHD1) inhibits retroviruses, DNA viruses and long interspersed element 1 (LINE-1). Given that in dividing cells, SAMHD1 loses its antiviral function yet still potently restricts LINE-1, we propose that, instead of blocking viral DNA synthesis by virtue of its dNTP triphosphohydrolase activity, SAMHD1 may exploit a different mechanism to control LINE-1. Here, we report a new activity of SAMHD1 in promoting cellular stress granule assembly, which correlates with increased phosphorylation of eIF2? and diminished eIF4A/eIF4G interaction. This function of SAMHD1 enhances sequestration of LINE-1 RNP in stress granules and consequent blockade to LINE-1 retrotransposition. In support of this new mechanism of action, depletion of stress granule marker proteins G3BP1 or TIA1 abrogates stress granule formation and overcomes SAMHD1 inhibition of LINE-1. Together, these data reveal a new mechanism for SAMHD1 to control LINE-1 by activating cellular stress granule pathway.
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