Functionalization of the cytochrome P450cam monooxygenase system in the cell-like aqueous compartments of water-in-oil emulsions

Junji Michizoe, Hirofumi Ichinose, Noriho Kamiya, Tatsuo Maruyama, Masahiro Goto

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The functionalization of the cytochrome P450cam monooxygenase system, which requires electron transfer among three different proteins, was investigated in the micro-scale aqueous compartments of stable water-in-oil (W/O) emulsions formed with the nonionic surfactant tetraethylene glycol dodecyl ether. Neither an organic-aqueous biphasic system nor a non-emulsified organic-aqueous solution containing the same amount of surfactant showed substantial hydroxylation of camphor, a natural substrate of P450cam, whereas substantial monooxygenation activity was detected when stable aqueous compartments were provided by the formation of W/O emulsions. Since the camphor hydroxylation in W/O emulsions was modest, we explored the integration of an enzymatic NADH regeneration system in order to effectively provide a reducing equivalent. Two different dehydrogenases, bacterial glycerol dehydrogenase (GLD) and yeast alcohol dehydrogenase (ADH), were selected, and each of these was coupled with the P450cam catalytic cycle in W/O emulsions. As a result, the camphor hydroxylation rate was successfully improved by approximately 5-fold when GLD was employed under optimized conditions. These results reveal the potential utility of the micro-scale cell-like aqueous compartments of W/O emulsions for multicomponent enzymatic reactions especially for substrates with low aqueous solubility.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalJournal of Bioscience and Bioengineering
Issue number1
Publication statusPublished - Jan 2005

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology


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