Biology:CD155

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Short description: Protein-coding gene in the species Homo sapiens


A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

CD155 (cluster of differentiation 155), also known as the poliovirus receptor, is a protein that in humans is encoded by the PVR gene.[1][2] It is a transmembrane protein that is involved in forming junctions between neighboring cells. It is also the molecule that poliovirus uses to enter cells. The gene is specific to the primates.

Function

CD155 is a Type I transmembrane glycoprotein in the immunoglobulin superfamily.[3] Its normal cellular function is in the establishment of intercellular adherens junctions between epithelial cells.[4]

The external domain mediates cell attachment to the extracellular matrix molecule vitronectin, while its intracellular domain interacts with the dynein light chain Tctex-1/DYNLT1.

The role of CD155 in the immune system is unclear, though it may be involved in intestinal humoral immune responses.[4] Subsequent data has also suggested that CD155 may also be used to positively select MHC-independent T cells in the thymus.[citation needed]

Polio

Commonly known as Poliovirus Receptor (PVR), the protein serves as a cellular receptor for poliovirus in the first step of poliovirus replication. Transgenic mice that express the PVR gene have been constructed in order to study polio experimentally.[5]

Structure

CD155 is a transmembrane protein with 3 extracellular immunoglobulin-like domains, D1-D3, where D1 is recognized by the virus.[6]

Low resolution structures of CD155 complexed with poliovirus have been obtained using electron microscopy[7] while a high resolution structures of the ectodomain D1 and D2 of CD155 were solved by x-ray crystallography.[6]

References

  1. "Entrez Gene: poliovirus receptor". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=5817. 
  2. "The poliovirus receptor protein is produced both as membrane-bound and secreted forms". EMBO J. 9 (10): 3217–24. October 1990. doi:10.1002/j.1460-2075.1990.tb07520.x. PMID 2170108. 
  3. "Cellular receptor for poliovirus: molecular cloning, nucleotide sequence, and expression of a new member of the immunoglobulin superfamily". Cell 56 (5): 855–65. 1989. doi:10.1016/0092-8674(89)90690-9. PMID 2538245. 
  4. 4.0 4.1 "The adhesion receptor CD155 determines the magnitude of humoral immune responses against orally ingested antigens". European Journal of Immunology 37 (8): 2214–25. 2007. doi:10.1002/eji.200737072. PMID 17621371. 
  5. Racaniello, Vincent R. (2006-01-05). "One hundred years of poliovirus pathogenesis" (in en). Virology. Virology 50th Anniversary Issue 344 (1): 9–16. doi:10.1016/j.virol.2005.09.015. ISSN 0042-6822. PMID 16364730. 
  6. 6.0 6.1 PDB: 3epc​, 3epd​, 3epf​, 3eow​; "Crystal structure of CD155 and electron microscopic studies of its complexes with polioviruses". Proc. Natl. Acad. Sci. U.S.A. 105 (47): 18284–9. November 2008. doi:10.1073/pnas.0807848105. PMID 19011098. Bibcode2008PNAS..10518284Z. 
  7. PDB: 1DGI​; "Interaction of the poliovirus receptor with poliovirus". Proc. Natl. Acad. Sci. U.S.A. 97 (1): 79–84. January 2000. doi:10.1073/pnas.97.1.79. PMID 10618374. 

External links

Further reading

This article incorporates text from the United States National Library of Medicine, which is in the public domain.