Structural basis of phosphodiesterase-5 conformational organization revealed by a PDE6/PDE5 Chimera

Dhiraj Srivastava; Sneha Singh; Chris Yu; Kimberly Boyd; Nikolai O Artemyev

doi:10.1016/j.jbc.2026.111467

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Structural basis of phosphodiesterase-5 conformational organization revealed by a PDE6/PDE5 Chimera

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Structural basis of phosphodiesterase-5 conformational organization revealed by a PDE6/PDE5 Chimera

Dhiraj Srivastava, Sneha Singh, Chris Yu, Kimberly Boyd and Nikolai O Artemyev

The Journal of biological chemistry, 111467

04/17/2026

DOI: 10.1016/j.jbc.2026.111467

PMID: 42001945

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Abstract

Phosphodiesterase 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.

Protein Folding

allosteric communication

cGMP

phosphodiesterase 5

phosphodiesterase 6

Details

Title: Subtitle: Structural basis of phosphodiesterase-5 conformational organization revealed by a PDE6/PDE5 Chimera
Creators: Dhiraj Srivastava - Department of Molecular Physiology and Biophysics
Sneha Singh - Department of Molecular Physiology and Biophysics
Chris Yu - University of Iowa
Kimberly Boyd - Department of Molecular Physiology and Biophysics
Nikolai O Artemyev - University of Iowa
Resource Type: Journal article
Publication Details: The Journal of biological chemistry, 111467
DOI: 10.1016/j.jbc.2026.111467
PMID: 42001945
ISSN: 1083-351X
eISSN: 1083-351X
Publisher: Elsevier
Language: English
Electronic publication date: 04/17/2026
Academic Unit: Molecular Physiology and Biophysics; Iowa Neuroscience Institute; Ophthalmology and Visual Sciences
Record Identifier: 9985155644702771

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