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Molecular and Cellular Biology, August 2002, p. 5813-5825, Vol. 22, No. 16
0270-7306/02/$04.00+0 DOI: 10.1128/MCB.22.16.5813-5825.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
The Zinc Finger Domain of NEMO Is Selectively Required for NF-
B Activation by UV Radiation and Topoisomerase Inhibitors
Tony T. Huang,1 Shelby L. Feinberg,2 Sainath Suryanarayanan,1 and Shigeki Miyamoto1,2*
Programs in Molecular and Cellular Pharmacology,1
Cellular and Molecular Biology, Department of Pharmacology, University of WisconsinMadison, Madison, Wisconsin 53706-15322
Received 8 March 2002/
Returned for modification 15 April 2002/
Accepted 10 May 2002
Exposure of mammalian cells to UV radiation was proposed to stimulate the transcription factor NF-
B by a unique mechanism. Typically, rapid and strong inducers of NF-
B, such as tumor necrosis factor alpha (TNF-
) and bacterial lipopolysaccharide (LPS), lead to rapid phosphorylation and proteasomal degradation of its inhibitory protein, I
B
. In contrast, UV, a relatively slower and weaker inducer of NF-
B, was suggested not to require phosphorylation of I
B
for its targeted degradation by the proteasome. We now provide evidence to account for this peculiar degradation process of I
B
. The phospho-I
B
generated by UV is only detectable by expressing a
F-box mutant of the ubiquitin ligase ß-TrCP, which serves as a specific substrate trap for serine 32 and 36 phosphorylated I
B
. In agreement with this finding, we also find that the I
B kinase (IKK) phospho-acceptor sites on I
B
, core components of the IKK signalsome, and IKK catalytic activity are all required for UV signaling. Furthermore, deletion and point mutation analyses reveal that both the amino-terminal IKK-binding and the carboxy-terminal putative zinc finger domains of NEMO (IKK
) are critical for UV-induced NF-
B activation. Interestingly, the zinc finger domain is also required for NF-
B activation by two other slow and weak inducers, camptothecin and etoposide. In contrast, the zinc finger module is largely dispensable for NF-
B activation by the rapid and strong inducers LPS and TNF-
. Thus, we suggest that the zinc finger domain of NEMO likely represents a point of convergence for signaling pathways initiated by slow and weak NF-
B-activating conditions.
* Corresponding author. Mailing address: Department of Pharmacology, University of WisconsinMadison, 3795 Medical Sciences Center, 1300 University Ave., Madison, WI 53706-1532. Phone: (608) 262-9281. Fax: (608) 262-1257. E-mail:
smiyamot{at}facstaff.wisc.edu.
Molecular and Cellular Biology, August 2002, p. 5813-5825, Vol. 22, No. 16
0022-538X/02/$04.00+0 DOI: 10.1128/MCB.22.16.5813-5825.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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