Protease Cleavage
Protease Cleavage - Related Videos
02:42
A Fluorogenic Peptide Cleavage Assay to Screen the Proteolytic Activity of Proteases
0 Views •
2025
This video demonstrates an assay to screen for the proteolytic activity of proteases using fluorogenic peptides. The protease recognizes its cleavage site on the peptide, cleaving it and separating the quencher from the fluorophore, enabling its fluorescence emission. The fluorescence signal is detected and analyzed to check for the cleavage efficiency of different peptide variants.
09:00
Use of the Protease Fluorescent Detection Kit to Determine Protease Activity
0 Views •
Cited by 17 •
2009
The Protease Fluorescent Detection Kit is designed for the measurement of protease activity using fluorometry. It is also suitable for detection of trace amounts of protease contamination. The method is based on the proteolytic hydroysis of a proprietary formulation of a FITC-labeled casein substrate.
08:14
A High-Throughput Luciferase Assay to Evaluate Proteolysis of the Single-Turnover Protease PCSK9
0 Views •
Cited by 1 •
2018
This protocol presents a method to evaluate the proteolytic activity of an intrinsically low-activity, single turnover protease in a cellular context. Specifically, this method is applied to evaluate the proteolytic activity of PCSK9, a key driver of lipid metabolism whose proteolytic activity is required for its ultimate hypercholesterolemic function.
19:23
Use of Recombinant Fusion Proteins in a Fluorescent Protease Assay Platform and Their In-gel Renaturation
0 Views •
Cited by 9 •
2019
Here, we present the detailed procedure of a recently developed protease assay platform utilizing N-terminal hexahistidine/maltose-binding protein and fluorescent protein-fused recombinant substrates attached to the surface of nickel-nitrilotriacetic acid magnetic agarose beads. A subsequent in-gel analysis of the assay samples separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis is also presented.
09:43
Protease- and Acid-catalyzed Labeling Workflows Employing 18O-enriched Water
0 Views •
Cited by 2 •
2013
Stable isotope labeling workflows employing 18O-enriched water (LeO-workflows) are versatile tools for quantitative and qualitative proteomics studies. In protease-assisted (PALeO) workflows, 18O-atoms are introduced by proteolytic cleavage and carboxyl oxygen exchange reactions mediated by proteases. In the acid-catalyzed (ALeO) workflow, 18O-atoms are introduced by carboxyl oxygen exchange at low pH.
FAQs
Selectivity arises because proteases recognize particular amino acid sequences or structural features before catalysis occurs. This recognition positions one peptide bond for attack by catalytic residues, often with water participating in hydrolysis. As a result, cleavage can produce a defined structural or functional change rather than indiscriminately fragmenting the entire protein.
Inactive zymogens provide a safety mechanism that separates protease production from protease activity. The precursor can be activated only after an appropriate processing event or biological signal, reducing the risk of premature cleavage of cellular proteins. This control is especially important when protease activity could alter signaling factors, digestive enzymes, or other essential substrates.
The target bond is influenced by the surrounding amino acid sequence and by structural features that make the site accessible to the enzyme. These recognition requirements help determine whether a protein is processed, activated, or degraded. Changes in sequence or folding can therefore alter cleavage outcomes without changing the protein’s overall identity.
Processing can remove a segment or separate domains in a way that changes conformation, activity, or interaction with other molecules. Instead of simply destroying the substrate, selective cleavage may convert an inactive precursor into an active factor or adjust an existing protein’s function. The biological result depends on the location and specificity of the event.
Biochemical assays use cleavage as a measurable event for studying protease activity, substrate recognition, or protein processing. Researchers can relate the observed processing outcome to the tested protein or peptide and evaluate how selectively the target is cut. These experiments support mechanistic studies as well as the characterization of engineered proteins and candidate therapeutic strategies.
Protease cleavage regulates proteins with diverse biological functions. It can activate hormones, digestive enzymes, and signaling proteins, while also contributing to the removal of damaged or unnecessary proteins. These outcomes connect selective processing with protein turnover and cell regulation, allowing biological systems to control when particular factors become active or are eliminated.
Infection, apoptosis, and disease can involve changes in protein activation, signaling, or turnover, all of which are influenced by selective cleavage. Studying these events helps researchers examine how proteins are processed during altered biological states. The resulting information can support investigation of disease mechanisms and guide therapeutic development or protein-engineering approaches.
Researchers can use cleavage specificity to design proteins that are processed at selected sites or to evaluate how therapeutic candidates are activated, modified, or degraded. Protease cleavage also provides a biochemical basis for testing engineered substrates and protein constructs. These applications connect detailed studies of recognition and catalysis with practical efforts to develop or optimize biological products.