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• W2021193295 endingPage "8952" @default.
• W2021193295 startingPage "8942" @default.
• W2021193295 abstract "Previous studies have shown that the combined presence of two cytochrome P450 enzymes (P450s) can affect the function of both enzymes, results that are consistent with the formation of heteromeric P450.P450 complexes. The goal of this study was to provide direct evidence for a physical interaction between P450 1A2 (CYP1A2) and P450 2B4 (CYP2B4), by determining if the interactions required both enzymes to reside in the same lipid vesicles. When NADPH-cytochrome P450 reductase (CPR) and a single P450 were incorporated into separate vesicles, extremely slow reduction rates were observed, demonstrating that the enzymes were anchored in the vesicles. Next, several reconstituted systems were prepared: 1) CPR.CYP1A2, 2) CPR.CYP2B4, 3) a mixture of CPR.CYP1A2 vesicles with CPR.CYP2B4 vesicles, and 4) CPR.CYP1A2.CYP2B4 in the same vesicles (ternary system). When in the ternary system, CYP2B4-mediated metabolism was significantly inhibited, and CYP1A2 activities were stimulated by the presence of the alternate P450. In contrast, P450s in separate vesicles were unable to interact. These data demonstrate that P450s must be in the same vesicles to alter metabolism. Additional evidence for a physical interaction among CPR, CYP1A2, and CYP2B4 was provided by cross-linking with bis(sulfosuccinimidyl) suberate. The results showed that after cross-linking, antibody to CYP1A2 was able to co-immunoprecipitate CYP2B4 but only when both proteins were in the same phospholipid vesicles. These results clearly demonstrate that the alterations in P450 function require both P450s to be present in the same vesicles and support a mechanism whereby P450s form a physical complex in the membrane." @default.
• W2021193295 created "2016-06-24" @default.
• W2021193295 creator A5009879916 @default.
• W2021193295 creator A5051060653 @default.
• W2021193295 creator A5072597345 @default.
• W2021193295 date "2010-03-01" @default.
• W2021193295 modified "2023-09-29" @default.
• W2021193295 title "Functional Interactions between Cytochromes P450 1A2 and 2B4 Require Both Enzymes to Reside in the Same Phospholipid Vesicle" @default.
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• W2021193295 doi "https://doi.org/10.1074/jbc.m109.076885" @default.
• W2021193295 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2838316" @default.
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• W2021193295 hasPublicationYear "2010" @default.
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