Mittoo, Stifun, Sundstrom, Lars E. and Bradley, Mark
Synthesis and evaluation of fluorescent probes for the detection of calpain activity
Analytical Biochemistry, 319, (2), . (doi:10.1016/S0003-2697(03)00324-5).
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Two new probes for the detection of calpain I activity based on fluorescence resonance energy transfer technology have been synthesized and evaluated. The probes incorporated the cleavage site present in ?-spectrin, a naturally occurring substrate of calpain I. The design of the internally quenched substrates is such that the calpain-sensitive bond of the peptides (between the Tyr-Gly residues) is located centrally between the donor and the quencher chromophores. The calpain assay protocol is capable of detecting enzymatic activity in the nanomolar region.
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