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2017 ; 12
(10
): e0186570
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Protein dynamics and structural waters in bromodomains
#MMPMID29077715
Zhang X
; Chen K
; Wu YD
; Wiest O
PLoS One
2017[]; 12
(10
): e0186570
PMID29077715
show ga
Bromodomains are epigenetic readers of acetylated lysines that are integral parts
of histone tails. The 61 bromodomains in humans are structurally highly conserved
but specifically bind to widely varying recognition motifs, suggesting that
dynamic rather than static factors are responsible for recognition selectivity.
To test this hypothesis, the dynamics of the binding sites and structural water
molecules of four bromodomains (ATAD2, BAZ2B, BRD2(1) and CREBBP) representing
four different subtypes is studied with 1 ?s MD simulations using the RSFF2 force
field. The different dynamics of the ZA-loops and BC-loops between the four
bromodomains leads to distinct patterns for the opening and closing of the
binding pocket. This in turn determines the structural and energetic properties
of the structural waters in the binding pocket, suggesting that these waters are
not only important for the recognition itself, as has been proposed previously,
but also contribute to the selectivity of different bromodomains.