Viral Protease
Viral Protease - Related Videos
09:00
Use of the Protease Fluorescent Detection Kit to Determine Protease Activity
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Cited by 15 •
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.
11:37
Sigma's Non-specific Protease Activity Assay - Casein as a Substrate
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Cited by 412 •
2008
Proteases break peptide bonds. In the lab, it is often necessary to measure and/or compare the activity of proteases. Sigma's non-specific protease activity assay may be used as a standardized procedure to determine the activity of proteases.
08:14
Determining Membrane Protein Topology Using Fluorescence Protease Protection (FPP)
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Cited by 18 •
2015
Here, we present a protocol to determine the orientation and topology of integral membrane proteins in living cells. This simple protocol relies on selective protease sensitivity of chimeras between the protein of interest and GFP.
06:59
Mouse Islet of Langerhans Isolation using a Combination of Purified Collagenase and Neutral Protease
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Cited by 103 •
2012
A detailed description of mouse islet isolation is described using the technique of in situ pancreatic ductal cannulation and perfusion of a combination of purified collagenase and neutral protease.
02:42
A Fluorogenic Peptide Cleavage Assay to Screen the Proteolytic Activity of Proteases
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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.
FAQs
Substrate recognition determines which peptide bonds a viral protease can hydrolyze. The enzyme identifies specific amino acid sequences within viral polyproteins or host-associated substrates, so cleavage occurs at selected positions rather than randomly. This selectivity controls which functional protein components are released and helps determine whether viral replication and particle maturation proceed successfully.
Viral polyproteins contain multiple protein components that must be separated into functional units. Examining how a protease cleaves these linked regions reveals its sequence preferences and shows how processing is coordinated with viral replication. The resulting cleavage pattern can also indicate which products contribute to replication machinery or structural components needed during particle formation.
Catalytic mechanisms explain how viral proteases hydrolyze peptide bonds after recognizing appropriate substrates. Studying these mechanisms connects molecular enzyme activity with larger events in the viral life cycle, including production of replication machinery and maturation of infectious particles. This mechanistic information is also important when evaluating how compounds might interfere with protease function.
Protease-mediated processing produces the functional structural proteins and replication components required by the virus. If those components are not released from their precursor forms, the sequence of events leading to particle maturation may be disrupted. Consequently, protease activity is closely connected to the production of infectious particles rather than being an isolated biochemical reaction.
A focused investigation can examine three connected features: the amino acid sequences recognized by the enzyme, the catalytic mechanism responsible for peptide-bond hydrolysis, and interactions with other viral proteins. Considering these features together links molecular cleavage events to replication and maturation, providing a biological framework for interpreting the protease’s role in the viral life cycle.
Many viruses depend on protease-mediated processing to generate the components required for replication and infectious particle formation. Inhibitors designed to interfere with this activity can therefore target a process essential to the viral life cycle. Research on substrate specificity and catalytic mechanisms helps identify features that support the development of protease inhibitors for treating infections.