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Research ArticleArticle

Conformational Variations of Both Phosphodiesterase-5 and Inhibitors Provide the Structural Basis for the Physiological Effects of Vardenafil and Sildenafil

Huanchen Wang, Mengchun Ye, Howard Robinson, Sharron H. Francis and Hengming Ke
Molecular Pharmacology January 2008, 73 (1) 104-110; DOI: https://doi.org/10.1124/mol.107.040212
Huanchen Wang
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Mengchun Ye
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Howard Robinson
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Sharron H. Francis
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Hengming Ke
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Abstract

Vardenafil has higher affinity to phosphodiesterase-5 (PDE5) than sildenafil and lower administered dosage for the treatment of erectile dysfunction. However, the molecular basis for these differences is puzzling because two drugs have similar chemical structures. Reported here is a crystal structure of the fully active and nonmutated PDE5A1 catalytic domain in complex with vardenafil. The structure shows that the conformation of the H-loop in the PDE5A1-vardenafil complex is different from those of any known structures of the unliganded PDE5 and its complexes with the inhibitors. In addition, the molecular configuration of vardenafil differs from that of sildenafil when bound to PDE5. It is noteworthy that the binding of vardenafil causes loss of the divalent metal ions that have been observed in all the previously published PDE structures. The conformational variation of both PDE5 and the inhibitors provides structural insight into the different potencies of the drugs.

Footnotes

  • This work was supported by National Institutes of Health grants GM59791 (to H.K.) and DK58277 (to S.F.).

  • ABBREVIATIONS: PDE, cyclic nucleotide phosphodiesterase; IBMX, 3-isobutyl-1-methylxanthine.

    • Received July 19, 2007.
    • Accepted October 24, 2007.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 73 (1)
Molecular Pharmacology
Vol. 73, Issue 1
1 Jan 2008
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Research ArticleArticle

Conformational Variations of Both Phosphodiesterase-5 and Inhibitors Provide the Structural Basis for the Physiological Effects of Vardenafil and Sildenafil

Huanchen Wang, Mengchun Ye, Howard Robinson, Sharron H. Francis and Hengming Ke
Molecular Pharmacology January 1, 2008, 73 (1) 104-110; DOI: https://doi.org/10.1124/mol.107.040212

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Research ArticleArticle

Conformational Variations of Both Phosphodiesterase-5 and Inhibitors Provide the Structural Basis for the Physiological Effects of Vardenafil and Sildenafil

Huanchen Wang, Mengchun Ye, Howard Robinson, Sharron H. Francis and Hengming Ke
Molecular Pharmacology January 1, 2008, 73 (1) 104-110; DOI: https://doi.org/10.1124/mol.107.040212
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