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EntityQ4505907· pop 8· linked from 107 articles

Also known as cystatin, Cystatin domain, protein family, IPR000010

The cystatins are a family of cysteine protease inhibitors which share a sequence homology and a common tertiary structure of an alpha helix lying on top of an anti-parallel beta sheet. The family is subdivided as described below.

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Cystatins
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8 sections
Contents
  • Types
  • Human cystatins
  • Plant cystatins
  • Membrane permeability
  • See also
  • References
  • Further reading
  • External links

The cystatins are a family of cysteine protease inhibitors which share a sequence homology and a common tertiary structure of an alpha helix lying on top of an anti-parallel beta sheet. The family is subdivided as described below.

Cystatins show similarity to fetuins, kininogens, histidine-rich glycoproteins and cystatin-related proteins. Cystatins mainly inhibit peptidase enzymes (another term for proteases) belonging to peptidase families C1 (papain family) and C13 (legumain family). They are known to mis-fold to form amyloid deposits and are implicated in several diseases.

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