Location of CYPs in the cell

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Location of CYPs in the cell Location of CYPs in the cell. The figure shows increasingly microscopic levels of detail, sequentially expanding the areas within the black boxes. CYPs are embedded in the phospholipid bilayer of the endoplasmic reticulum (ER). Most of the enzyme is located on the cytosolic surface of the ER. A second enzyme, NADPH-cytochrome P450 oxidoreductase, transfers electrons to the CYP where it can, in the presence of O2, oxidize xenobiotic substrates, many of which are hydrophobic and dissolved in the ER. A single NADPH-CYP oxidoreductase species transfers electrons to all CYP isoforms in the ER. Each CYP contains a molecule of iron-protoporphyrin IX that functions to bind and activate O2. Substituents on the porphyrin ring are methyl (M), propionyl (P), and vinyl (V) groups. Source: Drug Metabolism, Goodman and Gilman's Manual of Pharmacology and Therapeutics, 2e Citation: Hilal-Dandan R, Brunton LL. Goodman and Gilman's Manual of Pharmacology and Therapeutics, 2e; 2016 Available at: http://accesspharmacy.mhmedical.com/DownloadImage.aspx?image=/data/books/1810/hilgg2_ch6_f002.png&sec=124489952&BookID=1810&ChapterSecID=124489935&imagename= Accessed: November 07, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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