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2014 ; 289
(30
): 20717-26
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The tumor suppressor chromodomain helicase DNA-binding protein 5 (CHD5) remodels
nucleosomes by unwrapping
#MMPMID24923445
Quan J
; Yusufzai T
J Biol Chem
2014[Jul]; 289
(30
): 20717-26
PMID24923445
show ga
Although mutations or deletions of chromodomain helicase DNA-binding protein 5
(CHD5) have been linked to cancer and implicate CHD5 in tumor suppression, the
ATP-dependent activity of CHD5 is currently unknown. In this study, we discovered
that CHD5 is a chromatin remodeling factor with a unique enzymatic activity. CHD5
can expose nucleosomal DNA at one or two discrete positions in the nucleosome.
The exposure of the nucleosomal DNA by CHD5 is dependent on ATP hydrolysis, but
continued ATP hydrolysis is not required to maintain the nucleosomes in their
remodeled state. The activity of CHD5 is distinct from other related chromatin
remodeling ATPases, such as ACF and BRG1, and does not lead to complete
disruption or destabilization of the nucleosome. Rather, CHD5 likely initiates
remodeling in a manner similar to that of other remodeling factors but does not
significantly reposition the nucleosome. While the related factor CHD4 shows
strong ATPase activity, it does not unwrap nucleosomes as efficiently as CHD5.
Our findings add to the growing evidence that chromatin remodeling ATPases have
diverse roles in modulating chromatin structure.