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J. Biol. Chem., Vol. 276, Issue 13, 10185-10190, March 30, 2001
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From the The NOT4 protein is a component of the CCR4·NOT
complex, a global regulator of RNA polymerase II transcription. Human
NOT4 (hNOT4) contains a RING finger motif of the
C4C4 type. We expressed and purified the
N-terminal region of hNOT4 (residues 1-78) encompassing the RING
finger motif and determined the solution structure by heteronuclear
NMR. NMR experiments using a 113Cd-substituted hNOT4 RING
finger showed that two metal ions are bound through cysteine residues
in a cross-brace manner. The three-dimensional structure of the hNOT4
RING finger was refined with root mean square deviation values of
0.58 ± 0.13 Å for the backbone atoms and 1.08 ± 0.12 Å for heavy atoms. The hNOT4 RING finger consists of an The atomic coordinates and the structure factors (code 1E4U) have been deposited in the Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (http://www.rcsb.org/).
The Structure of the C4C4
RING Finger of Human NOT4 Reveals Features Distinct from Those of
C3HC4 RING Fingers*
§¶,
**,

,
,
§§, and
¶¶
Bijvoet Center for Biomolecular Research,
Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands, the
§ Biomedical Research Laboratories, Sankyo, Limited, 2-58 Hiromachi 1-chome, Shinagawa-ku, Tokyo 140, Japan, and the
Laboratory for Physiological Chemistry and the Centre for
Biomedical Genetics, University Medical Center Utrecht,
3508 AB Utrecht, The Netherlands
-helix and
three long loops that are stabilized by zinc coordination. The overall
folding of the hNOT4 RING finger is similar to that of the
C3HC4 RING fingers. The relative orientation of
the two zinc-chelating loops and the
-helix is well conserved. However, for the other regions, the secondary structural elements are distinct.
*
This work was supported in part by grants from the
European Communities Program "Access to Large Scale
Facilities" and by the Netherlands Foundation for Chemical Research.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

Supported by a postdoctoral fellowship from the Netherlands
Organization for Scientific Research-Medical Sciences.
§§
Supported by a Pioneer grant from the Netherlands Organization
for Scientific Research-Medical Sciences.
¶¶
To whom correspondence should be addressed. Tel.:
31-30-253-4035; Fax: 31-30-243-7623; E-mail:
Boelens@NMR.chem.uu.nl.
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