The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions. The cystatin locus on chromosome 20 contains the majority of the type 2 cystatin genes and pseudogenes. This gene is located in the cystatin locus and encodes a protein found in saliva and tears. The encoded protein may play a protective role against proteinases present in the oral cavity. [provided by RefSeq, Jul 2008]
Subcellular localization of CST5 (and its protein):
Gene Ontology (GO) terms for CST5:
| Interacting Gene | Interaction | Source/Score |
| Disease | Score | NofPmids | NofSnps | Source |
| Tobacco Use Disorder | 0.002367032 | 1 | 0 | GAD |
| Hereditary cystatin C amyloid angiopathy | 0.001085767 | 4 | 0 | BeFree |
| Malignant tumor of colon | 0.000542884 | 2 | 0 | BeFree |
| Plaque, Amyloid | 0.000542884 | 2 | 0 | BeFree |
| Colon Carcinoma | 0.000542884 | 2 | 0 | BeFree |
| Non-Malignant Ascites Adverse Event | 0.000271442 | 1 | 0 | BeFree |
| Alzheimer's Disease | 0.000271442 | 1 | 0 | BeFree |
| Medullary carcinoma of thyroid | 0.000271442 | 1 | 0 | BeFree |
| Ovarian Carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Amyloidosis | 0.000271442 | 1 | 0 | BeFree |
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