Part E | 28
706 Part E Marine Microbiology and Biotechnology
zymatic route of the biotransformation of phenylacetonitrile 1. First came the hydrolysis of the nitrile group
and later, hydroxylation (insertion of hydroxyl in the
ortho position of the aromatic ring), because the corresponding carboxylic acids 2a–5a were produced only
by hydrolysis of the cyano group. The biotransformation of nitriles is not trivial, and here we describe an
efficient method for the production of phenylacetic acid
derivatives under mild and environmentally-friendly
conditions.
The induced biotransformation of specific nitrile groups by whole mycelia of the marine fungus
A. sydowii CBMAI 934 was highly effective, using an
eco-friendly methodology. The enzymes produced by
this marine fungus showed substrate specificities typical of arylaliphatic and aliphatic nitrilases and hereto
(aromatic) nitrile hydratases. The enzymes present in
this catalyst system of the fungus A. sydowii CBMAI
934 exhibited activity only on addition of the inducer,
indicating that these enzymes are constructive. The biotransformation of nitriles 1–5, containing a cyano group
attached to an sp
3 carbon atom, to the corresponding
carboxylic acids 1a–5a was achieved with good yields.
The marine fungus A. sydowii CBMAI 934 is thus
a promising biocatalyst for the preparation of important
arylaliphatic and aliphatic carboxylic acids.
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