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N(6)-methyladenosine of HIV-1 RNA regulates viral infection and HIV-1 Gag protein expression.

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Tirumuru N, Zhao BS, Lu W, Lu Z, He C, Wu L,


Tirumuru N, Zhao BS, Lu W, Lu Z, He C, Wu L, (click to view)

Tirumuru N, Zhao BS, Lu W, Lu Z, He C, Wu L,

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eLife 2016 7 025() doi 10.7554/eLife.15528

Abstract

The internal N(6)-methyladenosine (m(6)A) methylation of eukaryotic nuclear RNA controls post-transcriptional gene expression, which is regulated by methyltransferases (writers), demethylases (erasers), and m(6)A-binding proteins (readers) in cells. The YTH domain family proteins (YTHDF1-3) bind to m(6)A-modified cellular RNAs and affect RNA metabolism and processing. Here we show that YTHDF1-3 proteins recognize m(6)A-modified HIV-1 RNA and inhibit HIV-1 infection in cell lines and primary CD4(+) T-cells. We further mapped the YTHDF1-3 binding sites in HIV-1 RNA from infected cells. We found that overexpression of YTHDF proteins in cells inhibited HIV-1 infection mainly by decreasing HIV-1 reverse transcription, while knockdown of YTHDF1-3 in cells had the opposite effects. Moreover, silencing the m(6)A writers decreased HIV-1 Gag protein expression in virus-producer cells, while silencing the m(6)A erasers increased Gag expression. Our findings suggest an important role of m(6)A modification of HIV-1 RNA in viral infection and HIV-1 protein synthesis.

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