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Pubmed ID :29198574
Publication Date : //

Design and application of a fluorogenic assay for monitoring inflammatory caspase activity.


Various fluorogenic assays exist for monitoring the activity of inflammatory caspases. However, there are no continuous assays that provide C-terminal substrate sequence specificity for inflammatory caspases. As a first step towards this, we have developed a continuous in vitro assay that relies on monitoring emission from tryptophan after cleavage of a quenching coumarin chromophore. The coumarin can be attached as an amino acid side chain or capping the C-terminus of the peptide. When the coumarin is a side chain, it allows for C-terminal and N-terminal sequence specificities to be explored. Using this assay, we obtained Michaelis-Menten kinetic data for four proof-of-principle peptides: WEHD-AMC (K = 15 ± 2 μM), WEHD-MCA (K = 93 ± 19 μM), WEHDG-MCA (K = 21 ± 6 μM) and WEHDA-MCA (K = 151 ± 37 μM), where AMC is 7-amino-4-methylcoumarin and MCA is β-(7-methoxy-coumarin-4-yl)-Ala. The results indicate the viability of this new assay approach in the design of effective fluorogenic substrates for inflammatory caspases.

Authors : Ranganathan Raj , Lenti Gena , Tassone Nicholas M , Scannell Brian J , Southern Cathrine A , Karver Caitlin E ,

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