4.5 Article

Restoration of mutant cytochrome P450 reductase activity by external flavin

Journal

MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 321, Issue 2, Pages 245-252

Publisher

ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2010.02.024

Keywords

Cytochrome P450 oxidoreductase; POR; Cytochrome P450; Steroidogenesis; Antley-Bixler syndrome; Sex steroids

Funding

  1. Swiss National Science Foundation [3100A0-113719]
  2. Novartis Foundation
  3. Roche Research Foundation
  4. Swiss society for Endocrinology Diabetology
  5. Bern University

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Cytochrome P450 oxidoreductase (POR) supplies electrons from NADPH to steroid and drug metabolizing reactions catalyzed by the cytochrome P450s located in endoplasmic reticulum Mutations in human POR cause a wide spectrum of disease ranging from disordered steroidogenesis to sexual differentiation Previously we and others have shown that POR mutations can lead to reduced activities of steroidogenic P450s CYP17A1,CYP19A1 and CYP21A1. Here we are reporting that mutations in the FMN binding domain of POR may reduce CYP3A4 activity, potentially influencing drug and steroid metabolism; and the loss of CYP3A4 activity may be correlated to the reduction of cytochrome b(5) by POR Computational molecular docking experiments with a FMN free structural model of POR revealed that an external FMN could be docked in close proximity to the FAD moiety and receive electrons donated by NADPH. Using FMN supplemented assays we have demonstrated restoration of the defective POR activity in vitro (C) 2010 Elsevier Ireland Ltd All rights reserved

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