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2016 ; 11
(4
): e0153360
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Design of Peptide Substrate for Sensitively and Specifically Detecting Two
A?-Degrading Enzymes: Neprilysin and Angiotensin-Converting Enzyme
#MMPMID27096746
Chen PT
; Chen CL
; Lin LT
; Lo CH
; Hu CJ
; Chen RP
; Wang SS
PLoS One
2016[]; 11
(4
): e0153360
PMID27096746
show ga
Upregulation of neprilysin (NEP) to reduce A? accumulation in the brain is a
promising strategy for the prevention of Alzheimer's disease (AD). This report
describes the design and synthesis of a quenched fluorogenic peptide substrate
qf-A?(12-16)AAC (with the sequence VHHQKAAC), which has a fluorophore, Alexa-350,
linked to the side-chain of its C-terminal cysteine and a quencher, Dabcyl,
linked to its N-terminus. This peptide emitted strong fluorescence upon cleavage.
Our results showed that qf-A?(12-16)AAC is more sensitive to NEP than the
previously reported peptide substrates, so that concentrations of NEP as low as
0.03 nM could be detected at peptide concentration of 2 ?M. Moreover,
qf-A?(12-16)AAC had superior enzymatic specificity for both NEP and
angiotensin-converting enzyme (ACE), but was inert with other A?-degrading
enzymes. This peptide, used in conjunction with a previously reported peptide
substrate qf-A?(1-7)C [which is sensitive to NEP and insulin-degrading enzyme
(IDE)], could be used for high-throughput screening of compounds that only
upregulate NEP. The experimental results of cell-based activity assays using both
qf-A?(1-7)C and qf-A?(12-16)AAC as the substrates confirm that somatostatin
treatment most likely upregulates IDE, but not NEP, in neuroblastoma cells.