Large interdomain rearrangement triggered by suppression of micro- to millisecond dynamics in bacterial Enzyme I.
Large interdomain rearrangement triggered by suppression of micro- to millisecond dynamics in bacterial Enzyme I.
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DOI:
10.1038/ncomms6960
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发表时间:
2015-01-12
影响因子:
16.6
通讯作者:
Clore, G. Marius
中科院分区:
文献类型:
--
作者:
Venditti, Vincenzo;Tugarinov, Vitali;Schwieters, Charles D.;Grishaev, Alexander;Clore, G. Marius
Enzyme I (EI), the first component of the bacterial phosphotransfer signal transduction system, undergoes one of the largest substrate-induced interdomain rearrangements documented to date. Here, we characterize the perturbations generated by two small molecules, the natural substrate phosphoenolpyruvate (PEP) and the inhibitor α-ketoglutarate (αKG), on the structure and dynamics of EI using NMR, small-angle X-ray scattering (SAXS) and biochemical techniques. The results indicate unambiguously that the open-to-closed conformational switch of EI is triggered by complete suppression of micro- to millisecond dynamics within the C-terminal domain of EI. Indeed, we show that a ligand-induced transition from a dynamic to a more rigid conformational state of the C-terminal domain stabilizes the interface between the N- and C-terminal domains observed in the structure of the closed state, thereby promoting the resulting conformational switch and autophosphorylation of EI. The mechanisms described here may be common to several other multidomain proteins and allosteric systems.
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影响因子:
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