Single-molecule protein unfolding and translocation by an ATP-fueled proteolytic machine.
Single-molecule protein unfolding and translocation by an ATP-fueled proteolytic machine.
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DOI:
10.1016/j.cell.2011.03.036
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发表时间:
2011-04-15
期刊:
影响因子:
64.5
通讯作者:
Lang MJ
中科院分区:
文献类型:
--
作者:
Aubin-Tam ME;Olivares AO;Sauer RT;Baker TA;Lang MJ
All cells employ ATP-powered proteases for protein-quality control and regulation. In the ClpXP protease, ClpX is a AAA+ machine that recognizes specific protein substrates, unfolds these molecules, and then translocates the denatured polypeptide through a central pore and into ClpP for degradation. Here, we use optical-trapping nanometry to probe the mechanics of enzymatic unfolding and translocation of single molecules of a multidomain substrate. Our experiments demonstrate the capacity of ClpXP and ClpX to perform mechanical work under load, reveal very fast and highly cooperative unfolding of individual substrate domains, suggest a translocation step size of 5–8 amino acids, and support a power-stroke model of denaturation in which successful enzyme-mediated unfolding of stable domains requires coincidence between mechanical pulling by the enzyme and a transient stochastic reduction in protein stability. We anticipate that single-molecule studies of the mechanical properties of other AAA+ proteolytic machines will reveal many shared features with ClpXP.
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影响因子:
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