|Title:||Recombinant chlorobenzene dioxygenase from Pseudomonas sp. P51: a biocatalyst for regioselective oxidation of aromatic nitriles|
|Authors :||Yildirim, Selçuk|
Franko, Telma T.
Kohler, Hans-Peter E.
|Published in :||Advanced Synthesis and Catalysis|
|Publisher / Ed. Institution :||Wiley|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|Subjects :||Nnitrile; Fermentation; Dihydroxylation; Biocatalysis|
|Subject (DDC) :||572: Biochemistry |
|Abstract:||An efficient biocatalyst was developed for the cis-dihydroxylation of aromatic nitriles. The chlorobenzene dioxygenase (CDO) genes of Pseudomonas sp. strain P51 were cloned under the strict control of the Palk promoter of Pseudomonas putida GPo1. Escherichia coli JM101 cells carrying the resulting plasmid pTEZ30 were used for the biotransformation of benzonitrile in a 2-L stirred tank bioreactor. Use of a stable expression system resulted in an average specific activity and an average volumetric productivity of 1.47 U/g cdw and 120 mg of product/h/L, respectively. The values represent a three-fold increase compared to the results of the similar biotransformations with E. coli JM101 (pTCB144) where the genes of CDO were expressed under the control of lac promoter. The productivity of the cis-dihydroxylation process was limited by product toxicity. Removal of the products at toxic concentrations by means of an external charcoal column resulted in an additional increase in product concentration by 43%. E. coli JM101 (pTEZ30) was further used for the regio- and stereospecific dihydroxylations of various monosubstituted benzonitriles, benzyl cyanide, and cinnamonitrile. Biotransformations resulted in products with 42.9 – 97.1% enantiomeric excess. Initial enzymatic activities and isolated yields were obtained in the range of 1.7 – 4.7 U/g cdw and of 3 – 62%, respectively.|
|Departement:||Life Sciences und Facility Management|
|Organisational Unit:||Institute of Food and Beverage Innovation (ILGI)|
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen Life Sciences und Facility Management|
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