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2-Cyanopyridine proved to act as a powerful nitrilase inducer in Aspergillus niger K10, Fusarium solani O1, Fusarium oxysporum CCF 1414, Fusarium oxysporum CCF 483 and Penicillium multicolor CCF 2244. Valeronitrile also enhanced the nitrilase activity in most of the strains. The highest nitrilase activities were produced by fungi cultivated in a Czapek-Dox(More)
Aspergillus niger K10 cultivated on 2-cyanopyridine produced high levels of an intracellular nitrilase, which was partially purified (18.6-fold) with a 24% yield. The N-terminal amino acid sequence of the enzyme was highly homologous with that of a putative nitrilase from Aspergillus fumigatus Af293. The enzyme was copurified with two proteins, the(More)
A large number of aromatic compounds and organic nitriles, the two groups of compounds covered in this review, are intermediates, products, by-products or waste products of the chemical and pharmaceutical industries, agriculture and the processing of fossil fuels. The majority of these synthetic substances (xenobiotics) are toxic and their release and(More)
The nitrile hydratase from Rhodococcus equi A4 consisted of two kinds of subunits which slightly differed in molecular weight (both approximately 25 kDa) and showed a significant similarity in the N-terminal amino acid sequences to those of the nitrile hydratase from Rhodococcus sp. N-774. The enzyme preferentially hydrated the S-isomers of racemic 2-(2-,(More)
Numbers of biologically active compounds are glycosides. Sometimes, the glycosidic residue is crucial for their activity, in other cases glycosylation only improves pharmacokinetic parameters. Recent developments in molecular glycobiology brought better understanding to the aglycone vs. glycoside activities, and made possible to develop new, more active or(More)
The range of possible nitrilase applications has been recently broadened but in most cases the parameters of the reactions need to be improved to establish viable industrial processes. To achieve this goal, several methods have been used, primarily in screening for enzymes from new sources, enzyme improvement, substrate structure modification, medium(More)
Of the numerous putative fungal nitrilases available from protein databases only a few enzymes were purified and characterized. The purified nitrilases from Fusarium solani, Fusarium oxysporum f. sp. melonis and Aspergillus niger share a preference for (hetero)aromatic nitriles, temperature optima between 40 and 50 degrees C and pH optima in the slightly(More)
The operational stabilities of nitrilases from Aspergillus niger K10 and Fusarium solani O1 were examined with 4-cyanopyridine as the substrate in continuous-stirred membrane reactors (CSMRs). The former enzyme was fairly stable at 30 degrees C with a deactivation constant (k (d)) and enzyme half-life of 0.014 h(-1) and 50 h, respectively, but the latter(More)
Rhodococcus equi A4 cells containing a nitrile hydratase and an amidase converted (R,S)-2-(4-methoxyphenyl)-propionitrile into the corresponding (S)-acid (e.e. 87%) and (R)-nitrile (e.e. > 95%) in 49% yield. The same reaction using (R,S)-2-(4-chlorophenyl)-propionitrile gave the (S)-acid (e.e. > 95%) and (R)-nitrile (e.e. 52%) in 20 and 34% yield,(More)
Nitrilases from Aspergillus niger CBS 513.88, A. niger K10, Gibberella moniliformis, Neurospora crassa OR74A, and Penicillium marneffei ATCC 18224 were expressed in Escherichia coli BL21-Gold (DE3) after IPTG induction. N. crassa nitrilase exhibited the highest yield of 69,000 U L−1 culture. Co-expression of chaperones (GroEL/ES in G. moniliformis and P.(More)