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Intermolecular disulfide bond formation in the NEMO dimer requires Cys54 and Cys347.

Abstract：

:NEMO is an essential regulatory component of the IkappaB kinase (IKK) complex, which controls activation of the NF-kappaB signaling pathway. Herein, we show that NEMO exists as a disulfide-bonded dimer when isolated from several cell types and analyzed by SDS-polyacrylamide gel electrophoresis under non-reducing conditions. Treatment of cells with hydrogen peroxide (H(2)O(2)) induces further formation of NEMO dimers. Disulfide bond-mediated formation of NEMO dimers requires Cys54 and Cys347. The ability of these residues to form disulfide bonds is consistent with their location in a NEMO dimer structure that we generated by molecular modeling. We also show that pretreatment with H(2)O(2) decreases TNFalpha-induced IKK activity in NEMO-reconstituted cells, and that TNFalpha has a diminished ability to activate NF-kappaB DNA binding in cells reconstituted with NEMO mutant C54/347A. This study implicates NEMO as a target of redox regulation and presents the first structural model for the NEMO protein.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Herscovitch M,Comb W,Ennis T,Coleman K,Yong S,Armstead B,Kalaitzidis D,Chandani S,Gilmore TD

doi

10.1016/j.bbrc.2007.12.123

subject

Has Abstract

pub_date

2008-02-29 00:00:00

pages

103-8

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)02742-8

journal_volume

367

pub_type

杂志文章

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