What is cathepsin activity?
Abstract. Cysteine cathepsins are a group of enzymes normally found in the endolysosomes where they are primarily involved in intracellular protein turnover but also have a critical role in MHC II-mediated antigen processing and presentation.
What is the function of cathepsin K?
Cathepsin K is a cysteine proteinase expressed predominantly in osteoclasts. Cathepsin K cleaves key bone matrix proteins and is believed to play an important role in degrading the organic phase of bone during bone resorption.
What is required for cathepsin activity?
Cathepsins require acidic pH for their optimum activity in contrast to the neutral pH found in extracellular space. However, cathepsins are often secreted as less active procathepsins which are normally stable at neutral pH [132].
Is cathepsin a lysosomal enzyme?
Cathepsin D is the main lysosomal enzyme involved in the degradation of alpha-synuclein and generation of its carboxy-terminally truncated species. Biochemistry. 2008 Sep 9;47(36):9678-87.
What is cathepsin K inhibitor?
Cathepsin K is a cysteine protease member of the cathepsin lysosomal protease family. Compared with other antiresorptive agents, cathepsin K inhibition is nearly equally efficacious for reducing biochemical markers of bone resorption but comparatively less active for reducing bone formation markers.
Is cathepsin an enzyme?
Cathepsins are part of a larger enzyme family called proteases, which are well known therapeutic targets. Cathepsins are a group of lysosomal proteases that have a key role in cellular protein turnover. The term cathepsin includes serine proteases, aspartic proteases, and cysteine proteases.
What are lysosomal proteases?
Lysosomal proteases belong to the aspartic, cysteine, or serine proteinase families of hydrolytic enzymes. They are expressed ubiquitously, and in a tissue- or cell type-specific manner. Although we still call them lysosomal proteases, the enzymes are usually detected within all vesicles of the endocytic pathway.
What is cysteine cathepsin?
Finally, cysteine cathepsins are important regulators and signaling molecules of an unimaginable number of biological processes. The current challenge is to identify their endogenous substrates, in order to gain an insight into the mechanisms of substrate degradation and processing.
What does cathepsin L stand for?
Cathepsin L ( EC 3.4.22.15, Aldrichina grahami cysteine proteinase) is an important lysosomal endopeptidase enzyme which is involved in the initiation of protein degradation. It is a member of the Peptidase C1 family, which play an important role in diverse processes including normal lysosome mediated protein turnover,…
What is the role of cathepsin L in human arthritis?
Cathepsin K has also been shown to play a role in arthritis. Mouse cathepsin L is homologous to human cathepsin V. Mouse cathepsin L has been shown to play a role in adipogenesis and glucose intolerance in mice. Cathepsin L degrades fibronectin, insulin receptor (IR), and insulin-like growth factor 1 receptor (IGF-1R).
Does cathepsin B enhance the activity of other proteases?
Cathepsin B may enhance the activity of other proteases, including matrix metalloproteinase, urokinase (serine protease urokinase plasminogen activator), and cathepsin D, and thus it has an essential position for the proteolysis of extracellular matrix components, intercellular communication disruption, and reduced protease inhibitor expression.
What is the function of cathepsin K in human and mouse cells?
The expression of cathepsin K in cultured endothelial cells is regulated by shear stress. Cathepsin K has also been shown to play a role in arthritis. Mouse cathepsin L is homologous to human cathepsin V. Mouse cathepsin L has been shown to play a role in adipogenesis and glucose intolerance in mice.
