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Structure and Function of C1-Inhibitor

Immunology and Allergy Clinics of North America, ISSN: 0889-8561, Vol: 26, Issue: 4, Page: 615-632
2006
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Review Description

C1-INH belongs to the family of serpins. Structural studies have yielded a clear understanding of the biochemical principle underlying the functional activities of these proteins. Although the crystal structure of C1-INH has yet to be revealed, homology modeling has provided a three-dimensional model of the serpin part of C1-INH. This model has helped us understand the biochemical consequences of mutations of the C1-INH gene as they occur in patients who have HAE. The structure of the N-terminal domain of C1-INH remains unknown; however, this part of the molecule is unlikely to be important in the inhibitory activity of C1-INH toward its target proteases. Mutations in this part have not been described in patients who have HAE, except for a deletion containing two cysteine residues involved in the stabilization of the serpin domain. Recent studies suggest some anti-inflammatory functions for this N-terminal part, possibly explaining the effects of C1-INH in diseases other than HAE. © 2006 Elsevier Inc. All rights reserved.

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