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167  structures 2966  species 0  interactions 15830  sequences 408  architectures

Clan: Cystatin (CL0121)

Summary

Cystatin-like superfamily Add an annotation

This superfamily includes cystatins and cathelicidins [1]. The cystatin superfamily comprises cysteine protease inhibitors that play key regulatory roles in protein degradation processes. The progenitor of this superfamily was most probably intracellular and lacked a signal peptide and disulfide bridges, much like the extant Giardia cystatin. A primordial gene duplication produced two ancestral eukaryotic lineages, cystatins and stefins. Stefins - included in Pfam:PF00031 - remain encoded by a single or a small number of genes throughout the eukaryotes, whereas the cystatins have undergone a more complex and dynamic evolution through numerous gene and domain duplications [2].

This clan contains 13 families and the total number of domains in the clan is 15830. The clan was built by A Bateman.

Literature references

  1. Murzin AG; , J Mol Biol 1993;230:689-694.: Sweet-tasting protein monellin is related to the cystatin family of thiol proteinase inhibitors. PUBMED:8464079 EPMC:8464079
  2. Kordis D, Turk V;, BMC Evol Biol. 2009;9:266.: Phylogenomic analysis of the cystatin superfamily in eukaryotes and prokaryotes. PUBMED:19919722 EPMC:19919722

Members

This clan contains the following 13 member families:

Cathelicidins Cystatin DUF3889 DUF5590 FTP Latexin Monellin PP1 Spp-24 SQAPI Staphopain_pro YebF YPEB

External database links

Domain organisation

Below is a listing of the unique domain organisations or architectures from this clan. More...

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Alignments

The table below shows the number of occurrences of each domain throughout the sequence database. More...

Pfam family Num. domains Alignment
Cystatin (PF00031) 6502 (41.1%) View
FTP (PF07504) 3846 (24.3%) View
SQAPI (PF16845) 2372 (15.0%) View
YPEB (PF14620) 747 (4.7%) View
Cathelicidins (PF00666) 603 (3.8%) View
DUF5590 (PF17881) 595 (3.8%) View
Latexin (PF06907) 476 (3.0%) View
DUF3889 (PF13028) 307 (1.9%) View
Spp-24 (PF07448) 271 (1.7%) View
YebF (PF13995) 62 (0.4%) View
PP1 (PF07430) 42 (0.3%) View
Staphopain_pro (PF14731) 7 (0.0%) View
Monellin (PF09200) 0 (0.0%) View
Total: 13 Total: 15830 Clan alignment
 

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Family relationships

This diagram shows the relationships between members of this clan. More...

Species distribution

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This tree shows the occurrence of the domains in this clan across different species. More...

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Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the MSD group, to allow us to map Pfam domains onto UniProt three-dimensional structures. The table below shows the mapping between the Pfam families in this clan, the corresponding UniProt entries, and the region of the three-dimensional structures that are available for that sequence.

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