1wd8

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[[Image:1wd8.gif|left|200px]]
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{{STRUCTURE_1wd8| PDB=1wd8 | SCENE= }}
{{STRUCTURE_1wd8| PDB=1wd8 | SCENE= }}
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'''Calcium free form of human peptidylarginine deiminase type4 (PAD4)'''
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===Calcium free form of human peptidylarginine deiminase type4 (PAD4)===
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==Overview==
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Peptidylarginine deiminase 4 (PAD4) is a Ca(2+)-dependent enzyme that catalyzes the conversion of protein arginine residues to citrulline. Its gene is a susceptibility locus for rheumatoid arthritis. Here we present the crystal structure of Ca(2+)-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 alpha/beta propeller structure. Five Ca(2+)-binding sites, none of which adopt an EF-hand motif, were identified in the structure of a Ca(2+)-bound inactive mutant with and without bound substrate. These structural data indicate that Ca(2+) binding induces conformational changes that generate the active site cleft. Our findings identify a novel mechanism for enzyme activation by Ca(2+) ions, and are important for understanding the mechanism of protein citrullination and for developing PAD-inhibiting drugs for the treatment of rheumatoid arthritis.
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The line below this paragraph, {{ABSTRACT_PUBMED_15247907}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 15247907 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15247907}}
==About this Structure==
==About this Structure==
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[[Category: Yamada, M.]]
[[Category: Yamada, M.]]
[[Category: Post-translational enzyme]]
[[Category: Post-translational enzyme]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:29:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:11:15 2008''

Revision as of 16:11, 28 July 2008

Image:1wd8.png

Template:STRUCTURE 1wd8

Calcium free form of human peptidylarginine deiminase type4 (PAD4)

Template:ABSTRACT PUBMED 15247907

About this Structure

1WD8 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for Ca(2+)-induced activation of human PAD4., Arita K, Hashimoto H, Shimizu T, Nakashima K, Yamada M, Sato M, Nat Struct Mol Biol. 2004 Aug;11(8):777-83. Epub 2004 Jul 11. PMID:15247907

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