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2016 ; 113
(22
): 6212-7
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Structural characterization of the ternary complex that mediates termination of
NF-?B signaling by I?B?
#MMPMID27185953
Mukherjee SP
; Quintas PO
; McNulty R
; Komives EA
; Dyson HJ
Proc Natl Acad Sci U S A
2016[May]; 113
(22
): 6212-7
PMID27185953
show ga
The transcription factor NF-?B is used in many systems for the transduction of
extracellular signals into the expression of signal-responsive genes. Published
structural data explain the activation of NF-?B through degradation of its
dedicated inhibitor I?B?, but the mechanism by which NF-?B-mediated signaling is
turned off by its removal from the DNA in the presence of newly synthesized I?B?
(termed stripping) is unknown. Previous kinetic studies showed that I?B?
accelerates NF-?B dissociation from DNA, and a transient ternary complex between
NF-?B, its cognate DNA sequence, and I?B? was observed. Here we structurally
characterize the >100-kDa ternary complex by NMR and negative stain EM and show a
modeled structure that is consistent with the measurements. These data provide a
structural basis for previously unidentified insights into the molecular
mechanism of stripping.