期刊
STRUCTURE
卷 24, 期 5, 页码 657-666出版社
CELL PRESS
DOI: 10.1016/j.str.2016.03.018
关键词
-
资金
- Canadian Institutes of Health Research [MOP-93778]
Rvb1 and Rvb2 are essential AAA+ proteins that interact together during the assembly and activity of diverse macro molecules including chromatin remodelers INO8O and SWR-C, and ribonucleoprotein complexes including telomerase and snoRNPs. ATP hydrolysis by Rvb1/2 is required for function; however, the mechanism that drives substrate remodeling is unknown. Here we determined the architecture of the yeast Rvb1/2 dodecamer using cryoelectron microscopy and identify that the substrate-binding insertion domain undergoes conformational changes in response to nucleotide state. 2D and 3D classification defines the dodecamer flexibility, revealing distinct arrangements and the hexamer-hexamer interaction interface. Reconstructions of the apo, ATP, and ADP states identify that Rvb1/2 undergoes substantial conformational changes that include a twist in the insertion-domain position and a corresponding rotation of the AAA+ ring. These results reveal how the ATP hydrolysis cycle of the AAA+ domains directs insertion-domain movements that could provide mechanical force during remodeling or helicase activities.
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