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Domain organization and conformational plasticity of the G protein effector, PDE6.


ABSTRACT: The cGMP phosphodiesterase of rod photoreceptor cells, PDE6, is the key effector enzyme in phototransduction. Two large catalytic subunits, PDE6? and -?, each contain one catalytic domain and two non-catalytic GAF domains, whereas two small inhibitory PDE6? subunits allow tight regulation by the G protein transducin. The structure of holo-PDE6 in complex with the ROS-1 antibody Fab fragment was determined by cryo-electron microscopy. The ?11 Å map revealed previously unseen features of PDE6, and each domain was readily fit with high resolution structures. A structure of PDE6 in complex with prenyl-binding protein (PrBP/?) indicated the location of the PDE6 C-terminal prenylations. Reconstructions of complexes with Fab fragments bound to N or C termini of PDE6? revealed that PDE6? stretches from the catalytic domain at one end of the holoenzyme to the GAF-A domain at the other. Removal of PDE6? caused dramatic structural rearrangements, which were reversed upon its restoration.

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC4432299 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature

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Domain organization and conformational plasticity of the G protein effector, PDE6.

Zhang Zhixian Z   He Feng F   Constantine Ryan R   Baker Matthew L ML   Baehr Wolfgang W   Schmid Michael F MF   Wensel Theodore G TG   Agosto Melina A MA  

The Journal of biological chemistry 20150325 20


The cGMP phosphodiesterase of rod photoreceptor cells, PDE6, is the key effector enzyme in phototransduction. Two large catalytic subunits, PDE6α and -β, each contain one catalytic domain and two non-catalytic GAF domains, whereas two small inhibitory PDE6γ subunits allow tight regulation by the G protein transducin. The structure of holo-PDE6 in complex with the ROS-1 antibody Fab fragment was determined by cryo-electron microscopy. The ∼11 Å map revealed previously unseen features of PDE6, and  ...[more]

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