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Tbio
CST4
Cystatin-S

Protein Summary
Description
This protein strongly inhibits papain and ficin, partially inhibits stem bromelain and bovine cathepsin C, but does not inhibit porcine cathepsin B or clostripain. Papain is inhibited non-competitively. 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 type 2 salivary cysteine peptidase inhibitor. The protein is an S-type cystatin, based on its high level of expression in saliva, tears and semina ...more
Uniprot Accession IDs
Gene Name
Ensembl ID
  • ENST00000217423
  • ENSP00000217423
  • ENSG00000101441
Illumination Graph
Knowledge Table
Most Knowledge About
Knowledge Value (0 to 1 scale)
cell type or tissue
0.73
cell line
0.66
gene perturbation
0.53
interacting protein
0.46
disease
0.44


Protein Classes
No PANTHER Classes or DTO Classes found
IDG Development Level Summary
Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 141.87   (req: < 5)
Gene RIFs: 3   (req: <= 3)
Antibodies: 271   (req: <= 50)
Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 141.87   (req: >= 5)
Gene RIFs: 3   (req: > 3)
Antibodies: 271   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 4
Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligand: 0
Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0