CD81 molecule

mammalian protein found in Homo sapiens
Protein protein Q21131199
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CD81 molecule

Summary

CD81 molecule is a protein[1]. It draws 13 Wikipedia views per month (protein category, ranking #143 of 987).[2]

Key Facts

  • CD81 molecule's instance of is recorded as protein[3].
  • CD81 molecule's UniProt protein ID is recorded as P60033[4].
  • CD81 molecule's part of is recorded as tetraspanin[5].
  • CD81 molecule's part of is recorded as Tetraspanin, EC2 domain superfamily[6].
  • CD81 molecule's part of is recorded as auxiliary protein involved in transmembrane transport[7].
  • CD81 molecule's part of is recorded as Tetraspanin, conserved site, protein family[8].
  • CD81 molecule's Commons category is recorded as CD81 antigens[9].
  • CD81 molecule's MeSH descriptor ID is recorded as D060225[10].
  • CD81 molecule's has part is recorded as Tetraspanin, conserved site[11].
  • CD81 molecule's RefSeq protein ID is recorded as NP_001284578[12].
  • CD81 molecule's RefSeq protein ID is recorded as NP_004347[13].
  • CD81 molecule's RefSeq protein ID is recorded as XP_011518794[14].
  • CD81 molecule's PDB structure ID is recorded as 1G8Q[15].
  • CD81 molecule's PDB structure ID is recorded as 1IV5[16].
  • CD81 molecule's PDB structure ID is recorded as 3X0E[17].
  • CD81 molecule's PDB structure ID is recorded as 5DFW[18].
  • CD81 molecule's PDB structure ID is recorded as 5DFV[19].
  • CD81 molecule's Freebase ID is recorded as /m/03gvj76[20].
  • CD81 molecule's MeSH tree code is recorded as D12.776.543.900.070[21].
  • CD81 molecule's molecular function is recorded as protein binding[22].
  • CD81 molecule's molecular function is recorded as MHC class II protein complex binding[23].
  • CD81 molecule's molecular function is recorded as transferrin receptor binding[24].
  • CD81 molecule's molecular function is recorded as virus receptor activity[25].
  • CD81 molecule's molecular function is recorded as integrin binding[26].
  • CD81 molecule's molecular function is recorded as cholesterol binding[27].

Why It Matters

CD81 molecule draws 13 Wikipedia views per month (protein category, ranking #143 of 987).[2] It has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[28] It is known by 8 alternative names across languages and contexts.[29]

References

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

Direct Wikidata claims

  1. [3] . Q905695. Retrieved . wikidata.org.
  2. [4] . Q905695. Retrieved . wikidata.org.
  3. [5] . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  4. [6] . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  5. [7] . Retrieved . wikidata.org.
  6. [8] . wikidata.org.
  7. [9] . wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . InterPro Release 71.0. ebi.ac.uk. Provenance: wikidata.org.
  10. [12] . Q20641742. Retrieved . wikidata.org.
  11. [13] . Q20641742. Retrieved . wikidata.org.
  12. [14] . Q20641742. Retrieved . wikidata.org.
  13. [15] . Q905695. Retrieved . wikidata.org.
  14. [16] . Q905695. Retrieved . wikidata.org.
  15. [17] . Q905695. Retrieved . wikidata.org.
  16. [18] . Q905695. Retrieved . wikidata.org.
  17. [19] . Q905695. Retrieved . wikidata.org.
  18. [20] . wikidata.org.
  19. [21] . wikidata.org.
  20. [22] . Claudin association with CD81 defines hepatitis C virus entry.. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  21. [23] . MHC class II-associated proteins in B-cell exosomes and potential functional implications for exosome biogenesis. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  22. [24] . CD81 Promotes Both the Degradation of Transferrin Receptor 2 (TfR2) and the Tfr2-mediated Maintenance of Hepcidin Expression. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  23. [25] . Claudin association with CD81 defines hepatitis C virus entry.. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  24. [26] . The CD9, CD81, and CD151 EC2 domains bind to the classical RGD-binding site of integrin αvβ3.. Retrieved . ebi.ac.uk. Provenance: wikidata.org.
  25. [27] . Crystal Structure of a Full-Length Human Tetraspanin Reveals a Cholesterol-Binding Pocket. Retrieved . ebi.ac.uk. Provenance: wikidata.org.

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [28] . Wikidata sitelinks. wikidata.org.
  3. [29] . Wikidata aliases. 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). CD81 molecule. Retrieved May 3, 2026, from https://4ort.xyz/entity/cd81-molecule
MLA “CD81 molecule.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/cd81-molecule.
BibTeX @misc{4ortxyz_cd81-molecule_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{CD81 molecule}}, year = {2026}, url = {https://4ort.xyz/entity/cd81-molecule}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): CD81 molecule — https://4ort.xyz/entity/cd81-molecule (retrieved 2026-05-03)

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