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Issue 62, 2015
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Kinetic characterisation of the FAD dependent monooxygenase TropB and investigation of its biotransformation potential

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Abstract

Achieving regio-specific hydroxylation of aromatic compounds remains a major challenge in synthetic chemistry. By contrast, this transformation is readily accomplished in nature through the action of FAD-dependant monooxygenase enzymes. Here, we report the kinetic characterisation of one such enzyme, TropB, from the stipitatic acid biosynthetic pathway. Analogues of the TropB natural substrate, 3-methyl-orcinaldehyde, were synthesised and used to examine the substrate selectivity of this enzyme. TropB displays broad substrate tolerance, for instance accepting single-ring aromatic substrates containing a range of C-1 substituents with varying electronic and steric properties. These include nitro, nitrosyl, alkyl, and aryl keto groups. Bicyclic substrates, however, were rejected by TropB. Additionally, C-5 substituents on single-ring aromatic substrates were not tolerated whereas the presence of a 6-methyl group was found to be important for substrate binding. Docking studies were employed to investigate and understand the broad substrate selectivity of TropB and identifies the key structural elements of its substrates. Our work has shown that TropB is an attractive target for biocatalyst engineering and industrial aromatic hydroxylation.

Graphical abstract: Kinetic characterisation of the FAD dependent monooxygenase TropB and investigation of its biotransformation potential

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Publication details

The article was received on 14 Apr 2015, accepted on 27 May 2015 and first published on 29 May 2015


Article type: Paper
DOI: 10.1039/C5RA06693J
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RSC Adv., 2015,5, 49987-49995
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    Kinetic characterisation of the FAD dependent monooxygenase TropB and investigation of its biotransformation potential

    A. Abood, A. Al-Fahad, A. Scott, A. E. M. S. Hosny, A. M. Hashem, A. M. A. Fattah, P. R. Race, T. J. Simpson and R. J. Cox, RSC Adv., 2015, 5, 49987
    DOI: 10.1039/C5RA06693J

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