The calcium-activated chloride channel (CLCA) protein family, which includes the human homologs CLCA1 and CLCA2, display distinct tissue distribution patterns. CLCA1 is expressed as a precursor protein that is processed into two cell surface associated subunits and a group of proteins. CLCA1 is upregulated by interleukin-9 and regulates the expression of mucins. CLCA1 may provide a therapeutic target to control mucus overproduction in airway disease patients with cystic fibrosis. CLCA2 expression is downregulated in breast cancer, therefore CLCA2 is thought to act as a tumor suppressor in normal cells. CLCA3 (known as Clca3 in mouse) is a structurally divergent member of the CLCA family that does not function as a channel protein. CLCA4 is a CLCA member that is expressed in human rectal mucosa, CLCA5 shows strong expression in eye and spleen, and CLCA6 is primarily expressed in intestine and stomach.
Function:
mCLCA3 (alias gob-5) is the third murine member of the family of calcium-activated chloride channels (CLCA-family). mCLCA3 plays a role in diseases with secretory dysfunctions, including asthma and cystic fibrosis. The mCLCA3 protein is located in mucin granule membranes of goblet cells of the intestinal, respiratory and reproductive tracts. It is also secreted into the mucin layer on mucosal membranes. The protein appears to be involved in the synthesis, condensation or secretion of mucins.
Subcellular Location:
Secreted
Tissue Specificity:
Exclusively expressed in the digestive and respiratory tracts and in the uterus (at protein level). Expressed in small intestine, colon, stomach, and uterus and slightly expressed in trachea tissue. Exclusively expressed in the mucin granule membranes of gastrointestinal, respiratory, and uterine goblet cells and other mucin-producing cells. In the colon, expressed in the surface mucous cells. In the stomach highly expressed in the surface epithelium in the pylorus. Strongly expressed in the airway epithelium of lung tissues associated with airway hyperresponsiveness (AHR).
Post-translational modifications:
he 110 kDa translation product is cleaved in the endoplasmic reticulum into a 75 kDa N-terminal and a 35 kDa SLCterminal products that remain physically associated with each other.
Glycosylated.
Similarity:
Belongs to the CLCR family.
Contains 1 VWFA domain.
SWISS:
Q8R049
Gene ID:
23844
Database links:
Entrez Gene: 23844 Mouse
SwissProt: Q8R049 Mouse
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