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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(47
): 32548-58
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The 3 -5 DNA exonuclease TREX1 directly interacts with poly(ADP-ribose)
polymerase-1 (PARP1) during the DNA damage response
#MMPMID25278026
Miyazaki T
; Kim YS
; Yoon J
; Wang H
; Suzuki T
; Morse HC 3rd
J Biol Chem
2014[Nov]; 289
(47
): 32548-58
PMID25278026
show ga
The main function of the 3'-5' DNA exonuclease TREX1 is to digest cytosolic
single-stranded DNA to prevent activation of cell-intrinsic responses to
immunostimulatory DNA. TREX1 translocates to the nucleus following DNA damage
with its nuclear activities being less well defined. Although mutations in human
TREX1 have been linked to autoimmune/inflammatory diseases, the mechanisms
contributing to the pathogenesis of these diseases remain incompletely
understood. Here, using mass spectrometry and co-immunoprecipitation assays and
in vivo overexpression models, we show that TREX1 interacts with poly(ADP-ribose)
polymerase-1 (PARP1), a nuclear enzyme involved in the DNA damage response. Two
zinc finger domains at the amino terminus of PARP1 were required for the
interaction with TREX1 that occurs after nuclear translocation of TREX1 in
response to DNA damage. Functional studies suggested that TREX1 may contribute to
stabilization of PARP1 levels in the DNA damage response and its activity. These
results provide new insights into the mechanisms of single-stranded DNA repair
following DNA damage and alterations induced by gene mutations.