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2014 ; 15
(11
): 1192-201
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Gcn5 and PCAF negatively regulate interferon-? production through HAT-independent
inhibition of TBK1
#MMPMID25269644
Jin Q
; Zhuang L
; Lai B
; Wang C
; Li W
; Dolan B
; Lu Y
; Wang Z
; Zhao K
; Peng W
; Dent SY
; Ge K
EMBO Rep
2014[Nov]; 15
(11
): 1192-201
PMID25269644
show ga
Viral infection triggers innate immune signaling, which in turn induces
interferon-? (IFN-?) production to establish innate antiviral immunity. Previous
studies showed that Gcn5 (Kat2a), a histone acetyltransferase (HAT) with partial
functional redundancy with PCAF (Kat2b), and Gcn5/PCAF-mediated histone H3K9
acetylation (H3K9ac) are enriched on the active IFNB gene promoter. However,
whether Gcn5/PCAF and H3K9ac regulate IFN-? production is unknown. Here, we show
that Gcn5/PCAF-mediated H3K9ac correlates well with, but is surprisingly
dispensable for, the expression of endogenous IFNB and the vast majority of
active genes in fibroblasts. Instead, Gcn5/PCAF repress IFN-? production and
innate antiviral immunity in several cell types in a HAT-independent and
non-transcriptional manner: by inhibiting the innate immune signaling kinase TBK1
in the cytoplasm. Our results thus identify Gcn5 and PCAF as negative regulators
of IFN-? production and innate immune signaling.