What is the optimal pH range for protease activity detection using the EnzChek Protease Assay Kit?
The digestion buffer provided in the kit (pH 7.8) is recommended for detecting the protease activity of most proteolytic enzymes with activity optima from pH 7.4 to 8.0. However, if you are working with an enzyme that requires activation compounds or a unique pH environment, then prepare the specific buffer required in place of the digestion buffer.
What is the shelf life for EnzChek Protease Assay kits (Cat. Nos. E6638, E6639)?
As stated in the manual (https://assets.thermofisher.com/TFS-Assets/LSG/manuals/mp06638.pdf) on page 2 under section "Storage and Handling", these kits are stable for 6-12 months if stored as indicated.
'BACKGROUND: Inhalation anthrax is characterized by a systemic spread of the challenge agent, Bacillus anthracis. It causes severe damage, including multiple hemorrhagic lesions, to host tissues and organs. It is widely believed that anthrax lethal toxin secreted by proliferating bacteria is a major cause of death, however, the pathology of ... More
Enzymatic microreactor-on-a-chip: protein mapping using trypsin immobilized on porous polymer monoliths molded in channels of microfluidic devices.
Authors:Peterson DS, Rohr T, Svec F, Fréchet JM
Journal:Anal Chem
PubMed ID:12199578
'Enzymatic microreactors have been prepared in capillaries and on microfluidic chips by immobilizing trypsin on porous polymer monoliths consisting of 2-vinyl-4,4-dimethylazlactone, ethylene dimethacrylate, and acrylamide or 2-hydroxyethyl methacrylate. The azlactone functionalities react readily with amine and thiol groups of the enzyme to form stable covalent bonds. The optimized porous properties ... More
Quenched BODIPY dye-labeled casein substrates for the assay of protease activity by direct fluorescence measurement.
Authors:Jones LJ, Upson RH, Haugland RP, Panchuk-Voloshina N, Zhou M, Haugland RP
Journal:Anal Biochem
PubMed ID:9299009
'We have prepared casein conjugates of two BODIPY dyes for use as fluorogenic protease substrates in homogeneous assays. Both conjugates are labeled to such an extent that the dyes are efficiently quenched in the protein, yielding virtually nonfluorescent substrate molecules. These fluorogenic substrates release highly fluorescent BODIPY dye-labeled peptides upon ... More
Functional screening of intracellular proteins in single cells and in patterned cell arrays using electroporation.
Authors:Nolkrantz K, Farre C, Hurtig KJ, Rylander P, Orwar O
Journal:Anal Chem
PubMed ID:12199607
'A tool for detection and characterization of intracellular enzyme-substrate and receptor-ligand interactions inside the cytoplasm of single targeted cells or small confined groups of cells is presented. Fluorogenic enzyme substrates and receptor ligands were rapidly delivered by electroosmosis and internalized by electroporation in cells using an electrolyte-filled capillary (EFC) biased ... More