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Cystatin S

mammalian protein found in Homo sapiens
Class type of: protein Q21171714

Facts

10 properties
Instance of
protein
Subclass of
protein[2]
Part of
Cystatin, cystatins, Proteinase inhibitor I25, cystatin, conserved site, protein family[3][4][5]
Biological process
negative regulation of proteolysis, retina homeostasis, negative regulation of peptidase activity, detection of chemical stimulus involved in sensory perception of bitter taste, negative regulation of cysteine-type endopeptidase activity, retina homeostasis, negative regulation of endopeptidase activity[16][17][18][19][20][21][22]
Cell component
extracellular region, extracellular exosome, extracellular space, extracellular space, extracellular exosome[11][12][13][14][15]
Encoded by
CST4[23]
Found in taxon
Homo sapiens
Has part(s)
Cystatin domain, Proteinase inhibitor I25, cystatin, conserved site[6][7]
Imported from
wholeness_audit_2026-05-02
Molecular function
peptidase inhibitor activity, cysteine-type endopeptidase inhibitor activity, protease binding[8][9][10]
🏷️ Also known as
en CST4 en cystatin 4 en Cystatin-4 en cystatin-S en Cystatin S en cystatin-SA-III en salivary acidic protein 1
🔖 Identifiers · 3
Ensembl protein ID
ENSP00000217423
RefSeq protein ID
NP_001890
UniProt protein ID
P01036

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Summary

Cystatin S is a protein[1].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . UniProt. Retrieved . wikidata.org.
  2. [3] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  6. [7] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  7. [8] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  8. [9] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  9. [10] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  10. [11] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  11. [12] ↑ . Proteomic analysis of podocyte exosome-enriched fraction from normal human urine. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  12. [13] ↑ . Comparison of tear protein levels in breast cancer patients and healthy controls using a de novo proteomic approach. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  13. [14] ↑ . Isolation of six cysteine proteinase inhibitors from human urine. Their physicochemical and enzyme kinetic properties and concentrations in biological fluids. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  14. [15] ↑ . Proteomic analysis of human parotid gland exosomes by multidimensional protein identification technology (MudPIT). Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  15. [16] ↑ . Isolation of six cysteine proteinase inhibitors from human urine. Their physicochemical and enzyme kinetic properties and concentrations in biological fluids. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  16. [17] ↑ . Shotgun proteomics reveals specific modulated protein patterns in tears of patients with primary open angle glaucoma naïve to therapy. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  17. [18] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  18. [19] ↑ . Salivary protein profiles are linked to bitter taste acceptance in infants. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  19. [20] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  20. [21] ↑ . Shotgun proteomics reveals specific modulated protein patterns in tears of patients with primary open angle glaucoma naïve to therapy. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  21. [22] ↑ . GOA. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  22. [23] ↑ . UniProt. Retrieved . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Cystatin S. Retrieved May 3, 2026, from https://4ort.xyz/entity/cystatin-s
MLA “Cystatin S.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/cystatin-s.
BibTeX @misc{4ortxyz_cystatin-s_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Cystatin S}}, year = {2026}, url = {https://4ort.xyz/entity/cystatin-s}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Cystatin S — https://4ort.xyz/entity/cystatin-s (retrieved 2026-05-03)

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