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- ARITA Kyouhei
- Field of Supramolecular Biology, International Graduate School of Arts and Sciene, Yokohama City University
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- SATO Mamoru
- Field of Supramolecular Biology, International Graduate School of Arts and Sciene, Yokohama City University
Bibliographic Information
- Other Title
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- カルシウム結合によって活性化されるヒストン修飾酵素PAD4の構造科学的基盤
- サイキン ノ ケンキュウ カラ カルシウム ケツゴウ ニ ヨッテ カッセイカ サレル ヒストン シュウショク コウソ PAD4 ノ コウゾウ カガクテキ キバン
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Abstract
Peptidylarginine deimianse 4 (PAD4) is a Ca2+-dependent enzyme that catalyzes the conversion of both arginine and mono-methyl arginine in histones into citrullines, and regulates both histone argininine methylation level and gene activity. Its gene is susceptibility locus for rheumatoid arthritis (RA) . Here we present the crystal structure of Ca2+-free wild-type PAD4, which shows that the polypeptide chain adopts an elongated fold in which the N-terminal domain forms two immunoglobulin-like subdomains, and the C-terminal domain forms an α/β propeller structure. Five Ca2+-binding sites, none of which adopts an EF-hand motif, were identified in the structure of a Ca2+-bound inactive mutant with and without bound substrate. These structural data indicate that Ca2+binding induces conformational changes that generate the active site cleft. Our findings identify a novel mechanism for enzyme activation by Ca2+ions, and are important for understanding the mechanism of protein citrullination and for developing PAD-inhibiting drugs for the treatment of RA.
Journal
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- Nihon Kessho Gakkaishi
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Nihon Kessho Gakkaishi 47 (4), 268-273, 2005
The Crystallographic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204086769536
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- NII Article ID
- 130000800473
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- NII Book ID
- AN00188364
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- ISSN
- 18845576
- 03694585
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- NDL BIB ID
- 7473657
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed