219362

Cathepsin B, humane Leber

Cathepsin B, Human Liver, CAS 9047-22-7, is a purified native cathepsin B from human liver, purified by affinity chromatography. Upregulated in many types of tumors.

• Synonym(e): Cathepsin B, humane Leber
• CAS-Nummer: 9047-22-7
• EC-Nummer: 3.4.22.1 (BRENDA, IUBMB)
• UNSPSC-Code: 12352202
• NACRES: NA.77

Eigenschaften

• Biologische Quelle: human liver
• Qualitätsniveau: 100
• Assay: ≥95% (SDS-PAGE)
• Form: liquid
• Spezifische Aktivität: ≥10 units/mg protein
• Aufgereinigt durch: affinity chromatography
• Hersteller/Markenname: Calbiochem^®
• Lagerbedingungen: OK to freeze; avoid repeated freeze/thaw cycles
• Methode(n): activity assay: suitable
• Eignung: suitable for molecular biology
• Anwendung(en): life science and biopharma
• Versandbedingung: wet ice
• Lagertemp.: −70°C
• Angaben zum Gen: human ... CTSB(1508)

Beschreibung

Allgemeine Beschreibung

Research area: Cell Signaling

Native cathepsin B from human liver, purified by affinity chromatography and HPLC. The most investigated enzyme of all lysosomal cysteine proteases. Cathepsin B belongs to the papain-like family of cysteine proteases and is produced as a preproenzyme. It is a bilobal protein, and its catalytic site is situated at the interface between the two lobes.

Anwendung

Cathepsin B, Human Liver, has been used in:

• Diagnostics: as a potent and independent prognostic marker for endometrial cancer, pancreatic adenocarcinoma, and inflammatory disease.
• Drug development: during the neovascularization process and as a potent therapeutic target for various pathologies, cancer progression, and osteoarthritis in humans.
• Pharmacology: for increasing the therapeutic index of doxorubicin by incorporating the cathepsin B cleavable spacer Phe-Lys-4-aminobenzyloxycarbonyl into an albumin-binding prodrug.
• Molecular biology: in cathepsin B activity assay.

Biochem./physiol. Wirkung

Cathepsin B acts as both endo and exopeptidase. While as an endopeptidase it cleaves amino acids with a large hydrophobic side chain in the P2 site of the protein/peptide substrate, on the other hand as an exopeptidase it eliminates two amino acids (dipeptide) from the C terminus of a polypeptide substrate, thereby categorizing the enzyme as a peptidyl dipeptidase. It maintains homeostatic metabolic activity within cells through regular turnover of both intracellular and extracellular proteins. Additionally, it is involved in various cellular functions like regulation of pro-enzyme and pro-hormone activation, tissue remodeling, antigen processing, apoptosis, and inflammatory responses to antigens. The expression and activity of cathepsin B have been linked to several pathologies, including cardiovascular disease, cancer, Alzheimer’s, arthritis, and pancreatitis. Overexpression of cathepsin B has been observed in brain, breast, gastric, prostate, esophageal, skin, lung, ovarian, colon, and thyroid cancers and correlates positively with their invasive and metastatic capabilities. Cathepsin B is shown to facilitate tumor invasion by dissolving extracellular barriers.

Warnhinweis

Toxizität: Standard-Handhabung (A)

Einheitendefinition

Eine Einheit ist als die Menge an Enzym definiert, die je Minute bei 40 °C und unter Verwendung von 100 mmol/l Na⁺/K⁺, pH-Wert 6,0, mit 1,33 mmol/l EDTA und 2 mmol/l DTT als Aktivierungspuffer 1,0 µmol Z-RR-βNaphthylamid hydrolysiert.

Physikalische Form

In 50 mmol/l Natriumacetatpuffer, 1 mmol/l EDTA, pH-Wert 5,0.

Angaben zur Herstellung

Aus Gewebe von Personen hergestellt, die in zertifizierten Tests für HBsAg und Antikörper gegen HIV und HCV als negativ befunden wurden.

Rekonstituierung

Nach dem erstmaligen Auftauen in Aliquote aufteilen und einfrieren (-70 °C).

Sonstige Hinweise

Hirai, K., et al. 1999. Hum. Pathol.30, 680.
Kostoulas, G., et al. 1999. FEBS Lett.455, 286.
Strojnik, T., et al. 1999. Clin. Cancer Res.5, 559.
Maquire, T.M., et al. 1998. Int. J. Biol. Markers13, 139.
Berquim, I.M. und Sloane, B.F. 1996. Adv. Exp. Med. Biol.389, 281.

Rechtliche Hinweise

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Sicherheitshinweise

• Lagerklassenschlüssel: 11 - Combustible Solids
• WGK: WGK 3
• Flammpunkt (°F): Not applicable
• Flammpunkt (°C): Not applicable