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Structure of PDE5 PDE6 chimera
Structural highlights
FunctionPDE5A_BOVIN Plays a role in signal transduction by regulating the intracellular concentration of cyclic nucleotides. This phosphodiesterase catalyzes the specific hydrolysis of cGMP to 5'-GMP (PubMed:8530505). Specifically regulates nitric-oxide-generated cGMP (By similarity).[UniProtKB:O76074][1] PDE6C_BOVIN As cone-specific cGMP phosphodiesterase, it plays an essential role in light detection and cone phototransduction by rapidly decreasing intracellular levels of cGMP.[UniProtKB:P51160] Publication Abstract from PubMedPhosphodiesterase 5 (PDE5) plays critical role in the nitric oxide-cGMP signaling pathway. Consequently, PDE5 catalytic site inhibitors are widely used in the treatment of erectile dysfunction and pulmonary arterial hypertension. Despite a wealth of structural data on the individual PDE5 catalytic domain with bound drug molecules, understanding of the structural organization of the full-length enzyme and its allosteric activation by noncatalytic cGMP-binding is lacking. To begin to understand the structural organization of PDE5, we solved a cryo-EM structure of a chimeric PDE enzyme (PDE6C/5) comprised of the regulatory domains of cone PDE6C and the PDE5 catalytic domain. The PDE6C/5 structure revealed the protein in the open state conformation similar to that of PDE6, suggesting a comparable conformation for the cGMP-bound PDE5 molecule. The H- and M-loops outlying the catalytic pocket, which are conformationally variable in the structures of isolated PDE5 catalytic domain, are immobilized in the PDE6/5 chimera via the interaction of the H-loop with a linker helix LH2. Decreased dynamics of these loops may underlie the higher catalytic activities of the full-length PDE5 and PDE6C/5 compared to that of the isolated PDE5 catalytic domain. Furthermore, the PDE6C/5 structure defines the folding requirement of the PDE6 catalytic domain for chaperone-dependent maturation that is important for vision. Structural basis of phosphodiesterase-5 conformational organization revealed by a PDE6/PDE5 Chimera.,Srivastava D, Singh S, Yu C, Boyd K, Artemyev NO J Biol Chem. 2026 Apr 17:111467. doi: 10.1016/j.jbc.2026.111467. PMID:42001945[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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