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2016 ; 7
(15
): 20425-39
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Acetylation and deacetylation of Cdc25A constitutes a novel mechanism for
modulating Cdc25A functions with implications for cancer
#MMPMID26967250
Lozada EM
; Andrysik Z
; Yin M
; Redilla N
; Rice K
; Stambrook PJ
Oncotarget
2016[Apr]; 7
(15
): 20425-39
PMID26967250
show ga
The dual specificity phosphatase Cdc25A is a key regulator of the cell cycle that
promotes cell cycle progression by dephosphorylating and activating
cyclin-dependent kinases. In response to genotoxicants, Cdc25A undergoes
posttranslational modifications which contribute to its proteasome-mediated
degradation and consequent cell cycle checkpoint arrest. The most thoroughly
studied Cdc25A modification is phosphorylation. We now provide the first evidence
that Cdc25A can be acetylated and that it directly interacts with the ARD1
acetyltransferase which acetylates Cdc25A both biochemically and in cultured
cells. When acetylated, Cdc25A has an extended half-life. We have also identified
the class IV histone deacetylase, HDAC11, as a Cdc25A deacetylase. We further
show that DNA damage, such as exposure to methyl methanesulfonate (MMS),
etoposide or arsenic, increases Cdc25A acetylation. Importantly, this acetylation
modulates Cdc25A phosphatase activity and its function as a cell cycle regulator,
and may reflect a cellular response to DNA damage. Since Cdc25A, ARD1, and HDAC11
are frequently dysregulated in multiple types of cancer, our findings may provide
insight into a novel mechanism in carcinogenesis.