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complement C1s

mammalian protein found in Homo sapiens
Protein protein Q21111743

Facts

11 properties
Instance of
protein
Part of
Spermadhesin, CUB domain superfamily, Complement C1s subcomponent, Peptidase S1, PA clan, Sushi/SCR/CCP superfamily, CUB domain, protein family, Sushi/SCR/CCP domain, protein family, Serine proteases, trypsin domain, protein family, EGF-like calcium-binding domain, protein family, Serine proteases, trypsin family, serine active site, protein family, EGF-like calcium-binding, conserved site, protein family[2][3][4][5][6][7][8][9][10][11]
Biological process
proteolysis, complement activation, classical pathway, immune system process, innate immune response, complement activation, lectin pathway, complement activation, regulation of complement activation
Cell component
blood microparticle, extracellular exosome, extracellular region, extracellular space, blood microparticle
EC enzyme number
3.4.21.42[19]
Encoded by
C1S
Found in taxon
Homo sapiens
Has part(s)
EGF-type aspartate/asparagine hydroxylation site, EGF-like calcium-binding, conserved site, CUB domain, serine proteases, trypsin domain, sushi/SCR/CCP domain, EGF-like calcium-binding domain, Serine proteases, trypsin family, serine active site[12][13][14][15][16][17][18]
Imported from
wholeness_audit_2026-05-02
Molecular function
calcium ion binding, peptidase activity, serine-type peptidase activity, protein binding, hydrolase activity, metal ion binding, identical protein binding, serine-type endopeptidase activity, serine-type endopeptidase activity, serine-type endopeptidase activity
Subject has role
immunologic factor
🏷️ Also known as
en basic proline-rich peptide IB-1 en C1 esterase en C1S en complement C1s en complement C1s subcomponent en complement component 1, s subcomponent en complement component 1 subcomponent s uk Компонент системи комплементу 1s

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Summary

complement C1s is a protein[1].

References

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

Direct Wikidata claims

  1. [2] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  2. [3] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  3. [4] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  4. [5] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  12. [13] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  13. [14] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  14. [15] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  15. [16] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  16. [17] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  17. [18] ↑ . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  18. [19] ↑ . 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). complement C1s. Retrieved May 3, 2026, from https://4ort.xyz/entity/complement-c1s-q21111743
MLA “complement C1s.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/complement-c1s-q21111743.
BibTeX @misc{4ortxyz_complement-c1s-q21111743_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{complement C1s}}, year = {2026}, url = {https://4ort.xyz/entity/complement-c1s-q21111743}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): complement C1s — https://4ort.xyz/entity/complement-c1s-q21111743 (retrieved 2026-05-03)

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