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J. Biol. Chem., Vol. 278, Issue 18, 15905-15910, May 2, 2003
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§,
§,
,
,
From the The cullin-containing ubiquitin-protein
isopeptide ligases (E3s) play an important role in regulating the
abundance of key proteins involved in cellular processes such as cell
cycle and cytokine signaling. They have multisubunit modular structures in which substrate recognition and the catalysis of ubiquitination are
carried out by distinct polypeptides. In a search for proteins involved
in regulation of cullin-containing E3 ubiquitin ligases we
immunopurified CUL4B-containing complex from HeLa cells and identified
TIP120A as an associated protein by mass spectrometry. Immunoprecipitation of cullins revealed that all cullins tested specifically interacted with TIP120A. Reciprocal immunoaffinity purification of TIP120A confirmed the stable interaction of TIP120A with cullin family proteins. TIP120A formed a complex with CUL1 and
Rbx1, but interfered with the binding of Skp1 and F-box proteins to
CUL1. TIP120A greatly reduced the ubiquitination of phosphorylated I
Department of Biochemistry and Protein
Network Research Center, Yonsei University, Seoul 120-749, Korea and
the ¶ Department of Biology, Faculty of Science, Chiba
University, Chiba 263-8522, Japan
B
by SCF
-TrCP ubiquitin ligase. These
results suggest that TIP120A functions as a negative regulator of SCF
E3 ubiquitin ligases and may modulate other cullin ligases in a similar fashion.
To whom correspondence should be addressed. Tel.:
82-2-2123-2704; Fax: 82-2-392-3488; E-mail:
yoonj@yonsei.ac.kr.
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