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A phenylalanine rotameric switch for signal-state control in bacterial chemoreceptors.


ABSTRACT: Bacterial chemoreceptors are widely used as a model system for elucidating the molecular mechanisms of transmembrane signalling and have provided a detailed understanding of how ligand binding by the receptor modulates the activity of its associated kinase CheA. However, the mechanisms by which conformational signals move between signalling elements within a receptor dimer and how they control kinase activity remain unknown. Here, using long molecular dynamics simulations, we show that the kinase-activating cytoplasmic tip of the chemoreceptor fluctuates between two stable conformations in a signal-dependent manner. A highly conserved residue, Phe396, appears to serve as the conformational switch, because flipping of the stacked aromatic rings of an interacting F396-F396' pair in the receptor homodimer takes place concomitantly with the signal-related conformational changes. We suggest that interacting aromatic residues, which are common stabilizers of protein tertiary structure, might serve as rotameric molecular switches in other biological processes as well.

SUBMITTER: Ortega DR 

PROVIDER: S-EPMC4310728 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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A phenylalanine rotameric switch for signal-state control in bacterial chemoreceptors.

Ortega Davi R DR   Yang Chen C   Ames Peter P   Baudry Jerome J   Parkinson John S JS   Zhulin Igor B IB  

Nature communications 20130101


Bacterial chemoreceptors are widely used as a model system for elucidating the molecular mechanisms of transmembrane signalling and have provided a detailed understanding of how ligand binding by the receptor modulates the activity of its associated kinase CheA. However, the mechanisms by which conformational signals move between signalling elements within a receptor dimer and how they control kinase activity remain unknown. Here, using long molecular dynamics simulations, we show that the kinas  ...[more]

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