Structural highlights
Function[CNRG_BOVIN] Participates in processes of transmission and amplification of the visual signal. cGMP-PDEs are the effector molecules in G-protein-mediated phototransduction in vertebrate rods and cones. Publication Abstract from PubMedThe cGMP phosphodiesterase of rod photoreceptor cells, PDE6, is the key effector enzyme in phototransduction. Two large catalytic subunits, PDE6alpha and -beta, each contain one catalytic domain and two non-catalytic GAF domains, whereas two small inhibitory PDE6gamma 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 approximately 11 A 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/delta) indicated the location of the PDE6 C-terminal prenylations. Reconstructions of complexes with Fab fragments bound to N or C termini of PDE6gamma revealed that PDE6gamma stretches from the catalytic domain at one end of the holoenzyme to the GAF-A domain at the other. Removal of PDE6gamma caused dramatic structural rearrangements, which were reversed upon its restoration. Domain Organization and Conformational Plasticity of the G Protein Effector, PDE6.,Zhang Z, He F, Constantine R, Baker ML, Baehr W, Schmid MF, Wensel TG, Agosto MA J Biol Chem. 2015 May 15;290(20):12833-43. doi: 10.1074/jbc.M115.647636. Epub, 2015 Mar 25. PMID:25809480[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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