Thioamide-based fluorescent protease sensors.
Thioamide-based fluorescent protease sensors.
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DOI:
10.1021/ja412297x
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发表时间:
2014-02-05
影响因子:
15
通讯作者:
Petersson EJ
中科院分区:
文献类型:
--
作者:
Goldberg JM;Chen X;Meinhardt N;Greenbaum DC;Petersson EJ
Thioamide quenchers can be paired with compact fluorophores to design “turn-on” fluorescent protease substrates. We have used this method to study a variety of serine-, cysteine-, carboxyl-, and metallo-proteases, including trypsin, chymotrypsin, pepsin, thermolysin, papain, and calpain. Since thioamides quench some fluorophores red-shifted from those naturally occurring in proteins, this technique can be used for real time monitoring of protease activity in crude preparations of virtually any protease. We demonstrate the value of this method in three model applications: (1) characterization of papain enzyme kinetics using rapid-mixing experiments, (2) selective monitoring of cleavage at a single site in a peptide with multiple proteolytic sites, and (3) analysis of the specificity of an inhibitor of calpain in cell lysates.
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