CTSB Active Protein

This gene encodes a member of the peptidase C1 family and preproprotein that is proteolytically processed to generate multiple protein products. These products include the cathepsin B light and heavy chains, which can dimerize to generate the double chain form of the enzyme. This enzyme is a lysosomal cysteine protease with both endopeptidase and exopeptidase activity that may play a role in protein turnover. Homozygous knockout mice for this gene exhibit reduced pancreatic damage following induced pancreatitis and reduced hepatocyte apoptosis in a model of liver injury. Pseudogenes of this gene have been identified in the genome. [provided by RefSeq, Aug 2015]

CTSB: Thiol protease which is believed to participate in intracellular degradation and turnover of proteins. Has also been implicated in tumor invasion and metastasis. Dimer of a heavy chain and a light chain cross-linked by a disulfide bond. Interacts with SRPX2. Belongs to the peptidase C1 family.

Protein type: Autophagy; EC 3.4.22.1; Motility/polarity/chemotaxis; Protease

Chromosomal Location of Human Ortholog: 14 D1|14 33.24 cM

Cellular Component: apical plasma membrane; caveola; cell surface; cytoplasm; external side of plasma membrane; extracellular region; extracellular space; intracellular membrane-bound organelle; lysosome; mitochondrion; nucleolus; perinuclear region of cytoplasm; sarcolemma

Molecular Function: collagen binding; cysteine-type endopeptidase activity; cysteine-type peptidase activity; endopeptidase activity; kininogen binding; peptidase activity; peptide binding; protein complex binding; protein self-association; proteoglycan binding

Biological Process: collagen catabolic process; decidualization; entry of virus into host cell; proteolysis; proteolysis involved in cellular protein catabolic process