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2017 ; 45
(15
): 8806-8821
Nephropedia Template TP
gab.com Text
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English Wikipedia
Mediator binds to boundaries of chromosomal interaction domains and to proteins
involved in DNA looping, RNA metabolism, chromatin remodeling, and actin
assembly
#MMPMID28575439
Chereji RV
; Bharatula V
; Elfving N
; Blomberg J
; Larsson M
; Morozov AV
; Broach JR
; Björklund S
Nucleic Acids Res
2017[Sep]; 45
(15
): 8806-8821
PMID28575439
show ga
Mediator is a multi-unit molecular complex that plays a key role in transferring
signals from transcriptional regulators to RNA polymerase II in eukaryotes. We
have combined biochemical purification of the Saccharomyces cerevisiae Mediator
from chromatin with chromatin immunoprecipitation in order to reveal Mediator
occupancy on DNA genome-wide, and to identify proteins interacting specifically
with Mediator on the chromatin template. Tandem mass spectrometry of proteins in
immunoprecipitates of mediator complexes revealed specific interactions between
Mediator and the RSC, Arp2/Arp3, CPF, CF 1A and Lsm complexes in chromatin. These
factors are primarily involved in chromatin remodeling, actin assembly, mRNA
3'-end processing, gene looping and mRNA decay, but they have also been shown to
enter the nucleus and participate in Pol II transcription. Moreover, we have
found that Mediator, in addition to binding Pol II promoters, occupies
chromosomal interacting domain (CID) boundaries and that Mediator in chromatin
associates with proteins that have been shown to interact with CID boundaries,
such as Sth1, Ssu72 and histone H4. This suggests that Mediator plays a
significant role in higher-order genome organization.