Claudin-18
Organism: Homo sapiens (Human) | Gene names: CLDN18, UNQ778/PRO1572
Entry: P56856
Mass: 27.856 Da
Transmembrane: 4
Subcellular location: Cell junction, tight junction {ECO:0000250|UniProtKB:P56857}. Cell membrane {ECO:0000250|UniProtKB:P56857}, Multi-pass membrane protein {ECO:0000255}. Note=Localizes to tight junctions in epithelial cells. {ECO:0000250|UniProtKB:P56857}.
Cofactor: -
Extinction coefficient: 1.396
Isoelectric Point: 8.39
PubMed ID: 11585919, 12975309, 15489334, 19047087
Family: Claudin family
Function:
Plays a major role in tight junction-specific obliteration of the intercellular space, through calcium-independent cell-adhesion activity. {ECO:0000250}.
Data from experiment(s):
Involvement in disease:
-
Binding site:
-
Tissue specificity:
Isoform A1: Expression is restricted to the lung (PubMed:19047087). Isoform A2: Expression is restricted to the stomach mucosa where it is predominantly observed in the epithelial cells of the pit region and the base of the gastric glands including exocrine and endocrine cells (at protein level) (PubMed:19047087). {ECO:0000269|PubMed:19047087}.
3D (X-ray crystallography):
-
Pharmaceutical use:
-
AS sequence:
MSTTTCQVVAFLLSILGLAGCIAATGMDMWSTQDLYDNPVTSVFQYEGLWRSCVRQSSGFTECRPYFTILGLPAMLQAVRALMIVGIVLGAIGLLVSIFALKCIRIGSMEDSAKANMTLTSGIMFIVSGLCAIAGVSVFANMLVTNFWMSTANMYTGMGGMVQTVQTRYTFGAALFVGWVAGGLTLIGGVMMCIACRGLAPEETNYKAVSYHASGHSVAYKPGGFKASTGFGSNTKNKKIYDGGARTEDEVQSYPSKHDYV
Creditnotes:
The protein visualizations are generated with the help of Protter:
Omasits, U., Ahrens, C.H., Müller, S., Wollscheid, B. “Protter: interactive protein feature visualization and integration with experimental proteomic data”. Bioinformatics. 2014 Mar 15; 30(6):884-6. doi: 10.1093/bioinformatics/btt607.
IP and extinction coefficients are gathered from Protparam by ExPASy:
Gasteiger, E., Hoogland, C., Gattiker, A., Duvaud, S., Wilkins, M.R., Appel, R.D., Bairoch, A. “Protein Identification and Analysis Tools on the ExPASy Server”. (In) John M. Walker (ed): The Proteomics Protocols Handbook, Humana Press (2005). pp. 571-607
The basic knowledge is found on UniProt:
The UniProt Consortium. “UniProt: the universal protein knowledgebase in 2021”. Nucleic Acids Res. 49:D1 (2021)
Omasits, U., Ahrens, C.H., Müller, S., Wollscheid, B. “Protter: interactive protein feature visualization and integration with experimental proteomic data”. Bioinformatics. 2014 Mar 15; 30(6):884-6. doi: 10.1093/bioinformatics/btt607.
IP and extinction coefficients are gathered from Protparam by ExPASy:
Gasteiger, E., Hoogland, C., Gattiker, A., Duvaud, S., Wilkins, M.R., Appel, R.D., Bairoch, A. “Protein Identification and Analysis Tools on the ExPASy Server”. (In) John M. Walker (ed): The Proteomics Protocols Handbook, Humana Press (2005). pp. 571-607
The basic knowledge is found on UniProt:
The UniProt Consortium. “UniProt: the universal protein knowledgebase in 2021”. Nucleic Acids Res. 49:D1 (2021)