Recombinant Human Cystatin-B (CSTB)

Uniprot Id

P04080

Target Species

Human

Target Name

CSTB

Target Full Name

Cystatin-B

Target Function

This is an intracellular thiol proteinase inhibitor. Tightly binding reversible inhibitor of cathepsins L, H and B.

Target Involvement

Epilepsy, progressive myoclonic 1 (EPM1)

Target Subcellular Location

Cytoplasm. Nucleus.

Target Protein Families

Cystatin family

Target Research Area

Cell Biology

Target Synonyms

CHROW21; CPI B; CPI-B; CST 6; CST6; CSTB; Cystatin B (stefin B); Cystatin B; Cystatin-B; CYTB; CYTB_HUMAN; EPM1; EPM1A; Liver thiol proteinase inhibitor; PME; Stefin-B; STF B; STFB; ULD

Target Background

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 kininogens. This gene encodes a stefin that functions as an intracellular thiol protease inhibitor. The protein is able to form a dimer stabilized by noncovalent forces, inhibiting papain and cathepsins l, h and b. The protein is thought to play a role in protecting against the proteases leaking from lysosomes. Evidence indicates that mutations in this gene are responsible for the primary defects in patients with progressive myoclonic epilepsy (EPM1). One type of mutation responsible for EPM1 is the expansion in the promoter region of this gene of a CCCCGCCCCGCG repeat from 2-3 copies to 30-78 copies.