Small molecule-induced allosteric activation of the Vibrio cholerae RTX cysteine protease domain.

Small molecule-induced allosteric activation of the Vibrio cholerae RTX cysteine protease domain.
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DOI:
10.1126/science.1162403
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发表时间:
2008-10-10
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Garcia KC
Garcia KC
中科院分区:
其他
文献类型:
--
作者:
Lupardus PJ;Shen A;Bogyo M;Garcia KC

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A eukaryotic-specific small molecule activates the protease domain of a Vibrio cholerae toxin, resulting in toxin autoprocessing and activation. Vibrio cholerae RTX (Repeats-in-Toxin) is an actin-disrupting toxin that is autoprocessed by an internal cysteine protease domain (CPD). The RTX CPD is efficiently activated by the eukaryote-specific small molecule inositol hexakisphosphate (InsP6) and we present the 2.1 angstrom structure of the RTX CPD in complex with InsP6. InsP6 binds to a conserved basic cleft that is distant from the protease active site. Biochemical and kinetic analyses of CPD mutants indicate that InsP6 binding induces an allosteric switch that leads to autoprocessing and intracellular release of toxin effector domains.
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