摘要:
Bei einem Verfahren zur stereoselektiven, insbesondere enantioselektiven enzymatischen Reduktion von Ketoverbindungen zu den entsprechenden chiralen Hydroxyverbindungen, wobei die Ketoverbindungen mit einer Oxidoreduktase reduziert werden, wird zur Reduktion der Ketoverbindungen ein Polypeptid eingesetzt, welches zur Gruppe der "short-chain"-Oxidoreduktasen zählt und folgende Merkmale aufweist: (i) einen N-terminalen Rossmann-Fold GxxxGxG, (ii) ein NNAG-Motiv an der Position 86, (iii) eine katalytische Triade, bestehend aus S 139, Y 152 und K 156, (iv) einen negativ geladenen Aminosäurerest an Position 37 (nach dem numerischen System von 3alpha,20beta-HSD); (v) ein C-terminales Motiv in der Dimerisierungsdomäne [V; I]-DG-[G;A]-Y-[T; V; C]-[A; T]-[Q; V; R; L], (vi) eine R-ADH-Signatur an der Position 204 bis 208: H-[P; A]-[I; A; Q; V]-GR, (vii) Val oder Leu an der Position 160 (4 Stellen abwärts der K 156), und (viii) Asp an der Position 178.
摘要:
This invention relates to novel alpha-substituted α,β-unsaturated E- or Z-aldehydes, or isomer mixture thereof, of the formula (I) in which R1 and R2 may be identical or different and are each H or a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms and R3 and R4 may be identical or different and are each a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms, and R5 may be identical or different and is H or a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms, to the use thereof, and to processes for their preparation. The invention further relates to the preparation of further intermediates for pharmaceuticals and to the preparation of the pharmaceuticals.
摘要:
A method of vanillin production from ferulic acid with a high concentration by biotransformation using a Streptomyces sp. strain is claimed in this invention. This strain is named as Streptomyces sp. V-1, which has been deposited in China Center for Type Culture Collection on July 12, 2006 with the number of CCTCC M 206065. Using this strain, high concentration of vanillin fermentation broth is obtained from ferulic acid by biotransformation in GY biotransformation medium. With the addition of macroporous adsorbent resin DM11, the concentration of vanillin can be greatly improved. The advantage of this invention is less environmental pollution, high product concentration, less by-product, short processing cycle, low production cost, simple product extraction, clean production process, product environmental friendly, safe and reliable, which solves many difficulties in the vanillin production from botanical raw material extraction or chemical synthesis, and therefore it has good application prospect.
摘要:
The present invention provides a method for efficiently converting methotrexate polyglutamates to methotrexate in a cellular extract by contacting the cellular extract with gamma glutamyl hydrolase under conditions suitable for efficient conversion of methotrexate polyglutamates to methotrexate.
摘要:
Verfahren zur enzymatischen Herstellung von Verbindungen der allgemeinen Formel (2) aus ungesättigten Alken-Derivaten der allgemeinen Formel (1) durch Reduktion einer Verbindung der Formel (1) in Gegenwart einer Reduktase umfassend wenigstens eine der Polypeptidsequenzen SEQ ID NO:1, 2, oder 3 oder mit einer funktional äquivalenten Polypeptidsequenz, die mindestens 80% Sequenzidentität mit SEQ ID NO:1, 2, oder 3 aufweist.
摘要翻译:饱和硝基,酮,醛或羧基衍生物的酶促生产涉及在多肽序列SEQ ID NO:1,2或3的还原酶存在下还原相应的不饱和烯烃衍生物。 2)由式(1)的不饱和烯烃包括在还原酶(i)的存在下还原(1)(i)包含多肽序列SEQ ID NO:1,2或3,或(ii)具有功能等同物 A:硝基,酮基(-CRO),醛(-CHO)或羧基(-COOR)基团;与SEQ ID NO:1,2或3相同的序列。 R:H或任选取代的1-6C烷基; R 1> -R 3> H,1-6C烷基,2-6C烯基,羧基或任选取代的碳 - 或杂环芳族或非芳族残基,或R 1>和R 3>(或R 1> 和R)可以连接形成4-至8-元环的一部分,条件是R 1,R 2和R 3>可以不相同。 [图片]。
摘要:
The present invention relates to fatty acid 13-hydroperoxide lyase protein from guava (Psidium guajava) and the gene encoding the protein. Expression systems for recombinant guava 13-hydroperoxide lyase and methods of using recombinant guava 13-hydroperoxide lyase for the production of green notes are provided.
摘要:
The invention relates to a method for producing, in essence, enantiomer-pure 3-hydroxycarboxylic acids or esters of general formula (III) by reacting racemic oxetan-2-ones of general formula (I) with compounds R3-OH of general formula (II) in the presence of a lipase from Candida antarctica or Burkholderia plantarii, and separating the obtained products of formula (III) and (IV) from one another, and the radicals have the following meanings: R 1 , R 2 and R 3 , independent of one another, represent H, C 1 -C 10 -substituted or unsubstituted alkyl, and substituted or unsubstituted aryl or hetaryl, whereby R 1 and R 2 cannot have the same meaning at the same time.
摘要:
The present invention is directed to a recombinant enzyme preparation having an alcohol and/or aldehyde dehydrogenase activity which comprises one or more enzymatic polypeptide(s) selected from the group consisting of polypeptides which are identified by SEQ ID NO 5, SEQ ID NO 6, SEQ ID NO 7 and SEQ ID NO 8 and chimeric recombinant enzymes between the polypeptides identified by SEQ ID NO 5, SEQ ID NO 6, SEQ ID NO 7 and SEQ ID NO 8 and functional derivatives of the polypeptides identified above which contain addition, insertion, deletion and/or substitution of one or more amino acid residue(s), wherein said enzymatic polypeptides have said alcohol and/or aldehyde dehydrogenase activity, DNA molecules encoding such polypeptides, vectors comprising such DNA molecules, host cells transformed by such vectors and processes for the production of such recombinant enzyme preparations, aldehyds, ketones or carboxylic acids by using such enzyme preparations and specifically 2-keto-L-gulonic acid and more specifically L-ascorbic acid (vitamin C).
摘要翻译:本发明涉及具有醇和/或醛脱氢酶活性的重组酶制剂,其包含一种或多种选自下组的酶多肽:由SEQ ID NO 5,SEQ ID NO 6, SEQ ID NO 7和SEQ ID NO 8所示的多肽和在由SEQ ID NO 5,SEQ ID NO 6,SEQ ID NO 7和SEQ ID NO 8所鉴定的多肽之间的嵌合重组酶,以及上述鉴定的多肽的功能性衍生物, ,其中所述酶多肽具有所述醇和/或醛脱氢酶活性的一个或多个氨基酸残基的缺失和/或取代,编码所述多肽的DNA分子,包含此类DNA分子的载体,由所述载体转化的宿主细胞和 通过使用这样的酶制剂并特别是2-酮基-L-古洛糖酸来制备这样的重组酶制剂,醛,酮或羧酸的方法 更具体地说是L-抗坏血酸(维生素C)。
摘要:
The present invention provides a fatty acid lyase, wherein the activity of the lyase for 9-hydroperoxide substrates is greater than the activity for 13-hydroperoxide substrates and wherein Km and Vmax of the lyase for 9-hydroperoxylinolenic acid are greater than Km and Vmax of the lyase for 9-hydroperoxylinoleic acid. More particularly, the invention provides a lyase present in melon Cucumis melo . The invention also provides a nucleic acid encoding the lyase, vectors, and expression systems with which the recombinant lyase can be obtained. The invention also provides methods of using the lyase of the invention, including methods of cleaving 9-hydroperoxylinoleic acid, 9-hydroperoxylinolenic acid, 13-hydroperoxylinoleic acid, and 13-hydroperoxylinolenic acid. Also, the invention provides a method of preparing 3-(Z)-nonenal, (3Z,6Z)-nonadienal, 2-(E)-nonenal, (2E,6Z)-nonadienal, or their corresponding alcohols and a method of preparing n-hexanal, 3-(Z)-hexen-1-al, 2-(E)-hexen-1-al, or their corresponding alcohols using the lyase of the present invention.
摘要:
The invention relates to a method for the step-wise oxidation of aromatic compounds to the corresponding aldehyde and/or carboxylic acid derivatives using genetically engineered microorganisms that express xylol monooxygenase or alkane monooxygenase.