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2016 ; 30
(10
): 1187-97
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English Wikipedia
Histone H3K4 methylation regulates deactivation of the spindle assembly
checkpoint through direct binding of Mad2
#MMPMID27198228
Schibler A
; Koutelou E
; Tomida J
; Wilson-Pham M
; Wang L
; Lu Y
; Cabrera AP
; Chosed RJ
; Li W
; Li B
; Shi X
; Wood RD
; Dent SY
Genes Dev
2016[May]; 30
(10
): 1187-97
PMID27198228
show ga
Histone H3 methylation on Lys4 (H3K4me) is associated with active gene
transcription in all eukaryotes. In Saccharomyces cerevisiae, Set1 is the sole
lysine methyltransferase required for mono-, di-, and trimethylation of this
site. Although H3K4me3 is linked to gene expression, whether H3K4 methylation
regulates other cellular processes, such as mitosis, is less clear. Here we show
that both Set1 and H3K4 mutants display a benomyl resistance phenotype that
requires components of the spindle assembly checkpoint (SAC), including Bub3 and
Mad2. These proteins inhibit Cdc20, an activator of the anaphase-promoting
complex/cyclosome (APC/C). Mutations in Cdc20 that block Mad2 interactions
suppress the benomyl resistance of both set1 and H3K4 mutant cells. Furthermore,
the HORMA domain in Mad2 directly binds H3, identifying a new histone H3 "reader"
motif. Mad2 undergoes a conformational change important for execution of the SAC.
We found that the closed (active) conformation of both yeast and human Mad2 is
capable of binding methylated H3K4, but, in contrast, the open (inactive) Mad2
conformation limits interaction with methylated H3. Collectively, our data
indicate that interactions between Mad2 and H3K4 regulate resolution of the SAC
by limiting closed Mad2 availability for Cdc20 inhibition.