This invention provides novel mutant strains of microorganisms (e.g., Pseudomonas putida Biotype A) which are capable of converting substrates such as toluene, p-xylene, catechol' and 4-methylcatechol to 2-hydroxymuconic semialdehyde or substituted analogue of 2-hydroxymuconic semialdehyde quantitatively by the meta (catechol 2,3-oxygenase) pathway.
No active 2-hydroxymuconic semialdehyde-metabolising enzymes are induced in the micro-organism, thereby permitting a 2-hydroxymuconic semialdehyde type metabolite to be produced and accumulated in a bioconversion medium containing the micro-organism.
Process for the preparation of pyridine-2,3-dicarboxylic acids
申请人:CELGENE CORPORATION
公开号:EP0390102A2
公开(公告)日:1990-10-03
Pyridine-2,3-dicarboxylic acids are prepared by the action of 2,3-dihydroxybenzoate-3,4-dioxygenase on 2,3-dihydroxybenzoic acids in a liquid medium which lacks active decarboxylase and which has a pH from 4 to 9, an ionic strength below about 1 molar, and a low concentration of metal cations and complex anions. In close temporal proximity, the 2-hydroxy-3-carboxymuconic acid semialdehyde which forms is allowed to react with a source of ammonia or a primary amine, avoiding substantial decarboxylation.
Probe compound for detecting and isolating enzymes and means and methods using the same
申请人:Helmholtz-Zentrum für Infektionsforschung GmbH
公开号:EP2230312A1
公开(公告)日:2010-09-22
The present invention relates to a probe compound that can comprise any substrate or metabolite of an enzymatic reaction in addition to an indicator component, such as, for example, a fluorescence dye, or the like. Moreover, the present invention relates to means for detecting enzymes in form of an array, which comprises any number of probe compounds of the invention which each comprise a different metabolite of interconnected metabolites representing the central pathways in all forms of life. Moreover, the present invention relates to a method for detecting enzymes involving the application of cell extracts or the like to the array of the invention which leads to reproducible enzymatic reactions with the substrates. These specific enzymatic reactions trigger the indicator (e.g. a fluorescence signal) and bind the enzymes to the respective cognate substrates. Moreover, the invention relates to means for isolating enzymes in form of nanoparticles coated with the probe compound of the invention. The immobilisation of the cognate substrates or metabolites on the surface of nanoparticles by means of the probe compounds allows capturing and isolating the respective enzyme, e.g. for subsequent sequencing.
Provided is a method for replicating a mirror nucleic acid, comprising: reacting a mirror nucleic acid template, a mirror nucleic acid primer and mirror dNTPs/rNTPs in the presence of a mirror nucleic acid polymerase, so as to obtain the mirror nucleic acid.
MEANS AND METHODS FOR SYNTHESIZING PRECURSORS OF Y-AMINOBUTYRIC ACID (GABA) ANALOGS
申请人:RIJKSUNIVERSITEIT GRONINGEN
公开号:EP3599246A1
公开(公告)日:2020-01-29
The invention relates to the fields of drug development and biocatalysis, more specifically to a biocatalytic route for asymmetric synthesis of precursors of y-aminobutyric acid (GABA) analogs. Provided is an isolated mutant 4-oxalocrototonate tautomerase (4-OT) enzyme comprising the following mutations (i) leucine at position 8 substituted with a tyrosine (L8Y) or a phenylalanine (L8F); (ii) methionine at position 45 substituted with a tyrosine (M45Y); and (iii) phenylalanine at position 50 substituted with an alanine (F50A), wherein the positions are numbered according to the amino acid sequence of 4-OT of Pseudomonas putida. Also provided is a method for the synthesis of a precursor for the pharmaceutically relevant enantiomer of a GABA analog, comprising (i) providing a y-nitroaldehyde using the 4-OT mutant enzyme, followed by (ii) subjecting the thus obtained y-nitroaldehyde to an enzymatic oxidation reaction catalyzed by an aldehyde dehydrogenase (EC 1.2.1.3).