BRCA1 functions as a novel transcriptional cofactor in HIV-1 infection

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dc.contributor.authorGuendel, Irene
dc.contributor.authorMeltzer, Beatrix W.
dc.contributor.authorBaer, Alan
dc.contributor.authorDever, Seth M.
dc.contributor.authorValerie, Kristoffer
dc.contributor.authorGuo, Jia
dc.contributor.authorWu, Yuntao
dc.contributor.authorKehn-Hall, Kylene
dc.date.accessioned2015-09-23T15:44:06Z
dc.date.available2015-09-23T15:44:06Z
dc.date.issued2015-03-06
dc.description.abstractBackground Viruses have naturally evolved elegant strategies to manipulate the host’s cellular machinery, including ways to hijack cellular DNA repair proteins to aid in their own replication. Retroviruses induce DNA damage through integration of their genome into host DNA. DNA damage signaling proteins including ATR, ATM and BRCA1 contribute to multiple steps in the HIV-1 life cycle, including integration and Vpr-induced G2/M arrest. However, there have been no studies to date regarding the role of BRCA1 in HIV-1 transcription. Methods Here we performed various transcriptional analyses to assess the role of BRCA1 in HIV-1 transcription by overexpression, selective depletion, and treatment with small molecule inhibitors. We examined association of Tat and BRCA1 through in vitro binding assays, as well as BRCA1-LTR association by chromatin immunoprecipitation. Results BRCA1 was found to be important for viral transcription as cells that lack BRCA1 displayed severely reduced HIV-1 Tat-dependent transcription, and gain or loss-of-function studies resulted in enhanced or decreased transcription. Moreover, Tat was detected in complex with BRCA1 aa504-802. Small molecule inhibition of BRCA1 phosphorylation effector kinases, ATR and ATM, decreased Tat-dependent transcription, whereas a Chk2 inhibitor showed no effect. Furthermore, BRCA1 was found at the viral promoter and treatment with curcumin and ATM inhibitors decreased BRCA1 LTR occupancy. Importantly, these findings were validated in a highly relevant model of HIV infection and are indicative of BRCA1 phosphorylation affecting Tat-dependent transcription. Conclusions BRCA1 presence at the HIV-1 promoter highlights a novel function of the multifaceted protein in HIV-1 infection. The BRCA1 pathway or enzymes that phosphorylate BRCA1 could potentially be used as complementary host-based treatment for combined antiretroviral therapy, as there are multiple potent ATM inhibitors in development as chemotherapeutics.
dc.description.sponsorshipPublication of this article was funded in part by the George Mason University Libraries Open Access Publishing Fund.
dc.identifier.citationGuendel, Irene, Beatrix W. Meltzer, Alan Baer, Seth M. Dever, Kristoffer Valerie, Jia Guo, Yuntao Wu, and Kylene Kehn-Hall. "BRCA1 functions as a novel transcriptional cofactor in HIV-1 infection." Virology Journal 12, no. 1 (2015): 40.
dc.identifier.doihttp://dx.doi.org/10.1186/s12985-015-0266-8
dc.identifier.urihttps://hdl.handle.net/1920/9904
dc.language.isoen_US
dc.publisherBioMed Central
dc.rightsAttribution 3.0 United States
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/us/
dc.subjectAntiviral
dc.subjectSmall molecule inhibitor
dc.subjectViral transcription
dc.subjectBRCA1
dc.subjectHIV-1
dc.subjectATM
dc.subjectPhosphorylation
dc.subjectPost-translational modification
dc.titleBRCA1 functions as a novel transcriptional cofactor in HIV-1 infection
dc.typeArticle

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