Cathepsin B Activity Assay Kit (Fluorometric)
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(111 Publications)
Cathepsin B Activity Assay Kit (Fluorometric) ab65300 is an easy and convenient assay for the detection of Cathepsin B activity. Based on an Ac-RR-AFC substrate; cleavage by Cathepsin B releases fluorescent AFC. Readout with any fluorometric (Ex/Em 400/505 nm) plate reader.
- Cited in > 90 publications
Individual kit components also available for purchase with a minimum order of 20 units. Contact us to discuss your needs.
View Alternative Names
CPSB, CTSB, Cathepsin B, APP secretase, Cathepsin B1, APPS
- FuncS
Lab
Functional Studies - Cathepsin B Activity Assay Kit (Fluorometric) (AB65300)
Cathepsin B activity in HL60 cell lysates (2.5x10e6 cells) with the addition of inhibitor.
- FuncS
PubMed
Functional Studies - Cathepsin B Activity Assay Kit (Fluorometric) (AB65300)
Functional studies - Cathespin B Activity Assay Kit.
Enzyme activity of Cathepsin B and Cathepsin D was determined using Cathepsin B/D activity assay kit (ab65300 and ab65302). Neuro2a cell lysates were centrifuged at 10,000 xg for 10 minutes at 4°C and supernatant was used for the assay. Cathepsin activity was performed at the 24 and 48 hours time points by cleavage of the fluorescence peptide substrate [DnP-DR-MCA, GKPILFFRLK(DnP)-DR substrate peptide labeled with MCA]. Data represent the mean ± SD (*p<0.05, **p<0.001).
Bong G.J., PLoS One 8(10), Fig 5F. doi:10.1371/journal.pone.0076466 Reproduced under the Creative Commons license http://creativecommons.org/licenses/by/4.0/
- Schematic Diagram
Supplier Data
Schematic Diagram - Cathepsin B Activity Assay Kit (Fluorometric) (AB65300)
Representative image of Cathepsin B Activity Assay Kit (Fluorometric) ab65300
Components shown from left to right :
- Cathepsin B Substrate
- Cathepsin Inhibitor
- Cathepsin Cell Lysis Buffer
- Cathepsin B Reaction Buffer
Note : The vial labels shown in this image use generic names for illustrative purposes only and may not exactly match the specific component names included in the kit.
Note : Colors of solutions in image may not precisely match the shade of colors in the actual kit.
Reactivity data
Product details
How the assay works
Cathepsin B Activity Assay Kit (Fluorometric) utilizes the preferred cathepsin-B substrate sequence RR labeled with AFC (amino-4-trifluoromethyl coumarin).
Cell lysates or other samples that contain cathepsin-B will cleave the synthetic substrate RR-AFC to release free AFC. The released AFC can easily be quantified using a fluorometer or fluorescence plate reader at Ex/Em 400/505 nm.
Cathepsin B Activity Assay Kit protocol summary:
-Prepare samples
- Add Cathepsin B Reaction Buffer/reaction buffer
- Add Ac-RR-AFC substrate
- Incubate for 1 -2 hours at 37°C
- Measure fluorescence (Ex/Em = 400/505 nm)
Related and recommended products
See below other alternative Cathepsin Assay Kits:
- Cathepsin L Assay Kit (Magic Red) ab270774
- Cathepsin K Assay Kit (Magic Red) ab270773
This product is manufactured by BioVision, an Abcam company and was previously called K140 Cathepsin B Activity Fluorometric Assay Kit. K140-100 is the same size as the 100 test size of ab65300.
The Safety Datasheet for this product has been updated for certain countries. Please check the current version in the Support and downloads section.
What's included?
Properties and storage information
Shipped at conditions
Appropriate short-term storage conditions
Appropriate long-term storage conditions
Storage information
Supplementary information
This supplementary information is collated from multiple sources and compiled automatically.
Biological function summary
Cathepsin B participates as a proteolytic enzyme involved in protein turnover and processing. It does not function in isolation but often associates with various other proteases forming complexes essential for efficient substrate breakdown. Cathepsin B assists in the activation of other enzymes by cleaving propeptides therefore facilitating the initiation of cascade reactions. This role is critical in maintaining cellular homeostasis and modulating physiological processes including cell migration and immune response modulation.
Pathways
Cathepsin B significantly contributes to the lysosomal protein degradation pathway and the autophagy-lysosome pathway. It interacts with proteins such as B protein which are important for cellular recycling and energy homeostasis. Its activity supports the MHC class II antigen processing pathway playing an essential part in immune system functionality. Cathepsin B also exhibits interactions with Ctsb protein inhibitors which regulate its proteolytic activity within these pathways.
Product protocols
- Visit the General protocols
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- Download websiteProtocolBooklet|en
Target data
Publications (111)
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Protein science : a publication of the Protein Society 34:e70173 PubMed40411408
2025
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Alzheimer's & dementia : the journal of the Alzheimer's Association 21:e70046 PubMed40339170
2025
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Translational psychiatry 15:126 PubMed40185739
2025
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Cell biology and toxicology 41:65 PubMed40175829
2025
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Proceedings of the National Academy of Sciences of the United States of America 122:e2425309122 PubMed40100622
2025
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MedComm 6:e70075 PubMed39968501
2025
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iScience 28:111654 PubMed39886472
2025
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Viruses 17: PubMed39861814
2025
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PloS one 20:e0316822 PubMed39841661
2025
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Experimental and therapeutic medicine 27:142 PubMed38476910
2024
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Product promise
Please note: All products are 'FOR RESEARCH USE ONLY. NOT FOR USE IN DIAGNOSTIC OR THERAPEUTIC PROCEDURES'.
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