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- W3113999377 abstract "ABSTRACT Retroviral integration requires the stable insertion of the viral genome into the host chromosomes. During this process, the functional integration complex must associate with cellular chromatin via the interaction between retroviral integrase and nucleosomes. The final association between the HIV-1 integration complex and the nucleosomal target DNA remains unclear and may involve the chromatin-binding properties of both the retroviral integrase and its cellular cofactor LEDGF/p75. To date, there is no experimental system allowing the direct monitoring of this protein association with chromatin to depict the molecular mechanism of this process fully. To investigate this and understand the LEDGF/p75-mediated chromatin tethering of HIV-1 integrase further, we used both biochemical approaches and an unedited chromosome-binding assays. Our study revealed that retroviral IN has an intrinsic ability to bind and recognize specific chromatin regions even in the absence of its cofactor. We also showed that this integrase chromatin-binding property was modulated by the interaction with its cofactor LEDGF/p75, which redirected the enzyme to alternative chromatin regions. Using these approaches, we also better determined the chronology of efficient LEDGF/p75-mediated targeting of HIV-1 integrase to chromatin. In addition to supporting a chromatin-binding function of the integrase protein acting in concert with LEDGF/p75 for the optimal association with the nucleosomal substrate, our work precisely elucidates the mechanism of action of LEDGF/p75 in this crucial integration step." @default.
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- W3113999377 date "2020-12-23" @default.
- W3113999377 modified "2023-10-16" @default.
- W3113999377 title "Analysis of the intrinsic chromatin binding property of HIV-1 integrase and its regulation by LEDGF/p75 using human chromosomes spreads" @default.
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- W3113999377 doi "https://doi.org/10.1101/2020.12.23.424107" @default.
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