Small-molecule activators of a proenzyme.

Small-molecule activators of a proenzyme.
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DOI:
10.1126/science.1177585
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发表时间:
2009-11-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Wells JA
Wells JA
中科院分区:
其他
文献类型:
--
作者:
Wolan DW;Zorn JA;Gray DC;Wells JA

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Virtually all of the 560 human proteases are stored as inactive proenyzmes and are strictly regulated. We report the identification and characterization of small molecules that directly activate the apoptotic proenzymes, procaspases-3 and -6. Surprisingly, these compounds induce autoproteolytic activation by stabilizing a conformation that is both more active and more susceptible to intermolecular proteolysis. These procaspase activators bypass the normal upstream proapoptotic signaling cascades and induce rapid apoptosis in a variety of cell lines. Systematic biochemical and biophysical analyses identified a cluster of mutations in procaspase-3 that resist small molecule activation both in vitro and in cells. Compounds that induce gain-of-function are rare and the activators reported here will enable direct control of the homodimeric executioner caspases in apoptosis and in cellular differentiation.
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