Abstract |
The zinc finger HIT domain is a sequence motif found in many proteins, including thyroid hormone receptor interacting protein 3 (TRIP-3), which is possibly involved in maturity-onset diabetes of the young ( MODY). Novel zinc finger motifs are suggested to play important roles in gene regulation and chromatin remodeling. Here, we determined the high-resolution solution structure of the zinc finger HIT domain in ZNHIT2 ( protein FON) from Homo sapiens, by an NMR method based on 567 upper distance limits derived from NOE intensities measured in three-dimensional NOESY spectra. The structure yielded a backbone RMSD to the mean coordinates of 0.19 A for the structured residues 12-48. The fold consists of two consecutive antiparallel beta-sheets and two short C-terminal helices packed against the second beta-sheet, and binds two zinc ions. Both zinc ions are coordinated tetrahedrally via a CCCC-CCHC motif to the ligand residues of the zf-HIT domain in an interleaved manner. The tertiary structure of the zinc finger HIT domain closely resembles the folds of the B-box, RING finger, and PHD domains with a cross- brace zinc coordination mode, but is distinct from them. The unique three-dimensional structure of the zinc finger HIT domain revealed a novel zinc-binding fold, as a new member of the treble clef domain family. On the basis of the structural data, we discuss the possible functional roles of the zinc finger HIT domain.
|
Authors | Fahu He, Takashi Umehara, Kengo Tsuda, Makoto Inoue, Takanori Kigawa, Takayoshi Matsuda, Takashi Yabuki, Masaaki Aoki, Eiko Seki, Takaho Terada, Mikako Shirouzu, Akiko Tanaka, Sumio Sugano, Yutaka Muto, Shigeyuki Yokoyama |
Journal | Protein science : a publication of the Protein Society
(Protein Sci)
Vol. 16
Issue 8
Pg. 1577-87
(Aug 2007)
ISSN: 0961-8368 [Print] United States |
PMID | 17656577
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Phosphoproteins
- Solutions
- ZNHIT2 protein, human
- Zinc
|
Topics |
- Amino Acid Sequence
- Consensus Sequence
- Humans
- Models, Molecular
- Molecular Sequence Data
- Nuclear Magnetic Resonance, Biomolecular
- Phosphoproteins
(chemistry, metabolism)
- Protein Structure, Secondary
- Protein Structure, Tertiary
- Sequence Alignment
- Solutions
(chemistry)
- Surface Properties
- Zinc
(chemistry, metabolism)
- Zinc Fingers
|