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- W2085159563 abstract "Angiotensin-converting enzyme 2 (ACE2 or ACEH) is a novel angiotensin-converting enzyme-related carboxypeptidase that cleaves a single amino acid from angiotensin I, des-Arg bradykinin, and many other bioactive peptides. Using des-Arg bradykinin as a template, we designed a series of intramolecularly quenched fluorogenic peptide substrates for ACE2. The general structure of the substrates was F-X-Q, in which F was the fluorescent group, Abz, Q was the quenching group (either Phe(NO2) or Tyr(NO2)), and X was the intervening peptide. These substrates were selectively cleaved by recombinant human ACE2, as shown by MS and HPLC. Quenching efficiency increased as the peptide sequence was shortened from 8 to 3 aa, and also when Tyr(NO2) was used as a quenching group instead of Phe(NO2). Two of the optimized substrates, TBC5180 and TBC5182, produced a signal:noise ratio of better than 20 when hydrolyzed by ACE2. Kinetic measurements with ACE2 were as follows: TBC5180, Km=58μM and kcat/Km=1.3×105M−1s−1; TBC5182, Km=23μM and kcat/Km=3.5×104M−1s−1. Thus, based on hydrolysis rate, TBC5180 was a better substrate than TBC5182. However, TBC5180 was also hydrolyzed by ACE, whereas TBC5182 was not cleaved, suggesting that TBC5182 was a selective for ACE2. We conclude that these two peptides can be used as fluorescent substrates for high-throughput screening for selective inhibitors of ACE2 enzyme." @default.
- W2085159563 created "2016-06-24" @default.
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- W2085159563 date "2003-01-01" @default.
- W2085159563 modified "2023-10-09" @default.
- W2085159563 title "Development of intramolecularly quenched fluorescent peptides as substrates of angiotensin-converting enzyme 2" @default.
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- W2085159563 doi "https://doi.org/10.1016/s0003-2697(02)00461-x" @default.
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