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Bovine Cathepsin D
Native whole molecule, Biologically active
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Proteins Synonyms: CatD, CTSD, CPSD Biological Activity: >400 units/mg protein Source: Bovine Spleen Purity: ≥ 95% by SDS-PAGE Physical State: Lyophilized from 2 mM Na phosphate, pH 6.5. Manufacturer: |
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Athens Research & Technology
Produktdetails
Synonyms
CatD, CTSD, CPSD
Description of Bovine Cathepsin D
Bovine Cathepsin D is a 42 kDa protein. Cathepsin D (CatD), a lysosomal aspartyl protease encoded by the CTSD gene, functions in protein degradation and activation of bioactive precursors through cleavage at acidic pH. Its structure includes a signal peptide, propeptide, and catalytic domain with two aspartic residues essential for enzymatic activity. Estrogen receptor (ER) signaling drives CatD overexpression in hormone-responsive breast cancers via TATA-dependent transcription initiation, mediated by upstream stimulatory factors USF-1/USF-2 binding to E-box elements. In ER-positive tumors, CatD secretion promotes metastasis by degrading extracellular matrix components and enhancing cell motility. Clinically, CatD expression correlates with aggressive breast cancer phenotypes, including high histological grade, and reduced survival. In Alzheimer’s disease (AD), CatD colocalizes with amyloid-β (Aβ) plaques and neurofibrillary tangles, where it degrades both Aβ42 and tau under normal conditions. However, Aβ42 accumulation competitively inhibits CatD, impairing tau clearance and exacerbating neurodegeneration. Cigarette smoke elevates CatD activity in alveolar macrophages and bronchoalveolar lavage fluid, contributing to emphysema via lung matrix degradation. Therapeutically, CatD serves as a prognostic biomarker for breast cancer stratification and a predictor of tamoxifen resistance. Inhibitors like pepstatin A and small-molecule analogs targeting its active site are under investigation for metastatic breast cancer and AD3. In smokers, monitoring BALF CatD levels (>3, 600 U/mL) may identify early lung damage, guiding preventive interventions. These dual roles in proteostasis and disease underscore CatD’s potential as a multifunctional therapeutic node.
Source
Prepared from spleen collected in the contiguous United States from animals under 30 months of age at a USDA-inspected facility. Animals were inspected ante mortem and found free from obvious signs of infectious and contagious diseases.
Biological Activity
>400 units/mg protein. One unit is defined as the amount of enzyme that digests hemoglobin, releasing peptides that are soluble in 10% TCA. The reaction is measured by an increase in A280 of 1.0 per 60 minutes at 37 ºC.
Storage
For long term, store Bovine Cathepsin D at ≤ -20°C.
Applications
Cancer, Alzheimer's, In Vitro Diagnostic.
Citations/Publications
NCBI: https://www.ncbi.nlm.nih.gov/protein/P80209
Shipped with ice packs
Gel Scan of Bovine Cathepsin D
| Fig. 1: SDS PAGE gel |
Usage: For research use only. Not for use in diagnostic or therapeutic procedures. Not for human use.
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Payment Methods
Paying by bank transfer
