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Structure of the SecY Complex Unlocked by a Preprotein Mimic

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Hizlan,  Dilem
Department of Structural Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Vonck,  Janet
Department of Structural Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Mills,  Deryck
Department of Structural Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Kühlbrandt,  Werner
Department of Structural Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Collinson,  Ian
Department of Structural Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Hizlan, D., Whitehouse, S., Gold, V. A., Vonck, J., Mills, D., Kühlbrandt, W., et al. (2012). Structure of the SecY Complex Unlocked by a Preprotein Mimic. Cell Reports, 1(1), 21-28. doi:10.1016/j.celrep.2011.11.003.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-D58E-C
Abstract
The Sec complex forms the core of a conserved machinery coordinating the passage of proteins across or into biological membranes. The bacterial complex SecYEG interacts with the ATPase SecA or translating ribosomes to translocate secretory and membrane proteins accordingly. A truncated preprotein competes with the physiological full- length substrate and primes the protein-channel complex for transport. We have employed electron cryomicroscopy of two-dimensional crystals to determine the structure of the complex unlocked by the preprotein. Its visualization in the native environment of the membrane preserves the active arrangement of SecYEG dimers, in which only one of the two channels is occupied by the polypeptide substrate. The signal sequence could be identified along with the corresponding conformational changes in SecY, including relocation of transmem- brane segments 2b and 7 as well as the plug, which presumably then promote channel opening. There- fore, we propose that the structure describes the translocon unlocked by preprotein and poised for protein translocation.