摘要:
Disclosed herein are compositions comprising blocked puromycin analogs that are converted into active puromycin analogs upon the activity of a penicillin acylase. Also disclosed are methods of using blocked puromycin analogs to label proteins in a selected cell type in vivo in a transgenic multicellular organism that expresses a penicillin acylase within the selected cell type. Also disclosed are transgenic mice expressing a penicillin acylase within a selected cell type.
摘要:
The invention relates to a process for preparing cephradine, said process comprising converting D-dihydrophenylglycine (DHPG) into an activated form (DHPGa); and reacting 7-aminodesacetoxy-cephalosporanic acid (7-ADCA) with D- dihydrophenylglycine in activated form (DHPGa) in the presence of an enzyme in an aqueous reaction mixture to form cephradine characterized in that at least step (a) and step (b) of the process are carried out under anaerobic conditions.
摘要:
The invention consists in a nucleotide sequence having the size of (2646) bp, wherein the order of nucleotides is identical to the order of the nucleotide sequence encoding penicillin acylase from Achromobacter sp. CCM 4824 (formerly Comamonas testosteroni CCM 4824), eventually of the fragments of this sequence having the length of at least 150 nucleotides. The sequence can be used in the formation of a DNA construct, eventually the construct having at least one regulatory sequence regulating the expression of the gene and the production of a polypeptide with the penicillin acylase activity. The sequence can form part of a recombinant expression vector, which consists of the above- mentioned construct, promoter, translational start signal, translational and transcriptional stop signal. Further, the invention concerns a recombinant host cell, containing the nucleic acid construct carried by the vector or integrated into the cell chromosome, and the E. coli BL21 strain containing said sequence of the nucleotides encoding the penicillin acylase carried in the pKXIPl, the pKLP3 or the pKLP6 plasmid.
摘要:
New mutant β-lactam acylases are provided exhibiting altered substrate specificities. These β-lactam acylases are obtained by expression of a gene encoding said β-lactam acylase and having an amino acid sequence which differs at least in one amino acid from the wild-type β-lactam acylase.
摘要:
The present invention relates to the hemi sulfuric acid salt of D-phenylglycine methyl ester, to a method for the preparation of said salt and to the use of said salt in the enzymatic synthesis of antibiotics and of D-phenylglycine methyl ester free base.
摘要:
Procedimiento para producir la enzima penicilina V acilasa de Streptomyces lavendulae en microorganismos recombinantes . El procedimiento de producción de la enzima comprende: (1) identificación del ADN correspondiente al gen pva, el cual codifica la enzima penicilina V acilasa de 5. lavendulae ATCC 13664, (2) clonación del citado gen en un vector apropiado para la célula hospedadora utilizada, (3) cultivo de las células hospedadoras recombinantes portadoras del gen pva y (4) recuperación de la enzima a partir del cultivo de las células. La enzima PVA obtenida se utiliza en la producción individual de antibióticos β-lactámicos, particularmente del ácido 6-aminopenicilánico (6 -APA) a partir de penicilina V, pero también puede utilizar otras penicilinas (K, F, y dihidro F) como sustrato.
摘要:
The present invention relates to a recombinant plasmid of figure 1, wherein (1) is pET- 26b(+) cloning/expression region with SEQ ID No. 1 cloned between BamH I site 198 and Nde I site 288, (2) is lac I coding sequence, (3) is pBR322 origin, (4) is Kan coding sequence, and (5) is f1 origin; a recombinant E.Coli strain PTA 2456; and lastly, a process for the production of large amount of Penicillin V acylase using recombinant E.Coli strain PTA 2456.
摘要翻译:本发明涉及图1的重组质粒,其中(1)是克隆在BamH I位点198和Nde I位点288之间的SEQ ID No.1的pET-26b(+)克隆/表达区,(2)是lac I编码序列,(3)是pBR322起源,(4)是Kan编码序列,(5)是f1起点; 重组大肠杆菌菌株PTA 2456; 最后,使用重组大肠杆菌菌株PTA 2456生产大量的青霉素V酰基转移酶的方法。
摘要:
Disclosed herein are compositions comprising blocked puromycin analogs that are converted into active puromycin analogs upon the activity of a penicillin acylase. Also disclosed are methods of using blocked puromycin analogs to label proteins in a selected cell type in vivo in a transgenic multicellular organism that expresses a penicillin acylase within the selected cell type. Also disclosed are transgenic mice expressing a penicillin acylase within a selected cell type.
摘要:
The present invention relates to 25 hitherto undescribed genes of B. licheniformis and gene products derived therefrom and all sufficiently homologous nucleic acids and proteins thereof. They occur in five different metabolic pathways for the formation of odorous substances. The metabolic pathways in question are for the synthesis of: 1) isovalerian acid (as part of the catabolism of leucine), 2) 2-methylbutyric acid and/or isobutyric acid (as part of the catabolism of valine and/or isoleucine), 3) butanol and/or butyric acid (as part of the metabolism of butyric acid), 4) propyl acid (as part of the metabolism of propionate) and/or 5) cadaverine and/or putrescine (as parts of the catabolism of lysine and/or arginine). The identification of these genes allows biotechnological production methods to be developed that are improved to the extent that, to assist these nucleic acids, the formation of the odorous substances synthesised via these metabolic pathways can be reduced by deactivating the corresponding genes in the micro-organism used for the biotechnological production. In addition, these gene products are thus available for preparing reactions or for methods according to their respective biochemical properties.
摘要:
Die vorliegende Anmeldung betrifft 25 zuvor nicht beschriebene Gene von B. licheniformis und davon abgeleitete Genprodukte sowie alle hinreichend homologen Nukleinsäuren und Proteine hierzu. Sie liegen auf fünf verschiedenen Stoffwechselwegen zur Bildung von Geruchsstoffen. Es handelt sich dabei um Stoffwechselwege zur Synthese von: 1) Isovaleriansäure (als Teil des Leucin-Katabolismus), 2) von 2-Methylbuttersäure und/oder Isobuttersäure (als Teil des Valin- und/oder Isoleucin-Katabolismus), 3) von Butanol und/oder Buttersäure (als Teil des Buttersäure-Metabolismus), 4) von Propylsäure (als Teil des Propionat-Metabolismus) und/oder 5) von Cadaverin und/oder Putrescin (als Teile des Lysin- und/oder Arginin-Katabolismus). Die Identifizierung dieser Gene ermöglicht biotechnologische Produktionsverfahren, die insofern verbessert sind, als mithilfe dieser Nukleinsäuren die Bildung der über diese Stoffwechselwege synthetisierten Geruchsstoffe durch Inaktivierung der zugehörigen Gene in dem für die biotechnologische Produktion verwendeten Mikroorganismus verringert werden kann. Zudem stehen diese Genprodukte damit für Reaktionsansätze oder Verfahren entsprechend ihrer jeweiligen biochemischen Eigenschaften zur Verfügung.