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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

6-methylhydroxylation of the anti-cancer agent 5,6-dimethylxanthenone-4-acetic acid (DMXAA) by flavin-containing monooxygenase 3.

The involvement of flavin-containing monooxygenase (FMO) in the 6-methylhydroxylation of the experimental anti-cancer drug 5,6-dimethylxanthenone-4-acetic acid (DMXAA) was investigated by use of human liver microsomes and microsomes containing cDNA-expressed FMOs. The involvement of FMO in the formation of 6-methyl hydroxylate of DMXAA, 6-hydroxymethyl-5-methylxanthenone-4-acetic acid (6-OH-MXAA) in human liver microsomes was indicated by the fact that this biotransformation was sensitive to heat treatment, increased at pH 8.3, and inhibited by methimazole. Only FMO3 formed 6-OH-MXAA at a similar rate to that in cDNA- expressed cytochromes P-450 (CYP)1A2. The results of this study indicate that human FMO3 has the capacity to form 6-OH-MXAA, but plays a lesser important role for this reaction than CYP1A2 that has been demonstrated to catalyse 6-OH-MXAA formation.[1]

References

  1. 6-methylhydroxylation of the anti-cancer agent 5,6-dimethylxanthenone-4-acetic acid (DMXAA) by flavin-containing monooxygenase 3. Zhou, S., Kestell, P., Paxton, J.W. European journal of drug metabolism and pharmacokinetics. (2002) [Pubmed]
 
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