Journal
EMBO JOURNAL
Volume 19, Issue 22, Pages 5971-5979Publisher
WILEY
DOI: 10.1093/emboj/19.22.5971
Keywords
actin; chaperonin; electron microscopy; protein folding; tubulin
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Three-dimensional reconstruction from cryoelectron micrographs of the eukaryotic cytosolic chaperonin CCT complexed to tubulin shows that CCT interacts with tubulin (both the a and beta isoforms) using five specific CCT subunits, The CCT-tubulin interaction has a different geometry to the CCT-actin interaction, and a mixture of shared and unique CCT subunits is used in binding the two substrates. Docking of the atomic structures of both actin and tubulin to their CCT-bound conformation suggests a common mode of chaperonin-substrate interaction. CCT stabilizes quasi-native structures in both proteins that are open through their domain-connecting hinge regions, suggesting a novel mechanism and function of CCT in assisted protein folding.
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