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2017 ; 7
(ä): 46097
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MKRN2 is a novel ubiquitin E3 ligase for the p65 subunit of NF-?B and negatively
regulates inflammatory responses
#MMPMID28378844
Shin C
; Ito Y
; Ichikawa S
; Tokunaga M
; Sakata-Sogawa K
; Tanaka T
Sci Rep
2017[Apr]; 7
(ä): 46097
PMID28378844
show ga
Activation of NF-?B transcription factor is strictly regulated to prevent
excessive inflammatory responses leading to immunopathology. However, it still
remains unclear how NF-?B activation is negatively controlled. The PDZ-LIM
domain-containing protein PDLIM2 is a nuclear ubiquitin E3 ligase targeting the
p65 subunit of NF-?B for degradation, thus terminating NF-?B-mediated
inflammation. Using yeast two-hybrid screening, we sought to isolate
PDLIM2-interacting proteins that are critical for suppressing NF-?B signaling.
Here we identified MKRN2, a RING finger domain-containing protein that belongs to
the makorin ring finger protein gene family, as a novel p65 ubiquitin E3 ligase.
MKRN2 bound to p65 and promoted the polyubiquitination and proteasome-dependent
degradation of p65 through the MKRN2 RING finger domain, thereby suppressing
p65-mediated NF-?B transactivation. Notably, MKRN2 and PDLIM2 synergistically
promote polyubiquitination and degradation of p65. Consistently, MKRN2 knockdown
in dendritic cells resulted in larger amounts of nuclear p65 and augmented
production of proinflammatory cytokines in responses to innate stimuli. These
results delineate a novel role of MKRN2 in negatively regulating NF-?B-mediated
inflammatory responses, cooperatively with PDLIM2.
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]