摘要:
Conductive carbon nanotubes (CNTs) obtained by dotting carboxylated CNTs with metal nanocrystals by chemical functional groups, are described, as well as a method for fabricating a pattern or film of the conductive CNTs which involves repeatedly depositing conductive CNTs on a substrate to achieve high surface density. A biosensor is described, in which bioreceptors that bind to target biomolecules are selectively attached to conductive CNTs or a conductive CNT pattern or film. By use of the conductive biosensor, various target biomaterials that bind or react with the bioreceptors can be precisely measured directly or by electrochemical signals at large amounts in one step. Additionally, the biosensor can be used for an electrical detection method capable of providing precise measurement results even with a small amount of source material.
摘要:
The present invention relates to the base sequence of whole genes involved in the biosynthesis of FR-008 polyketides derived from Streptomyces sp. FR-008. This base sequence comprises genes coding for ketosynthase (KS), acyl transferase (AT), acyl carrier protein (ACP), ketoreductase (KR), dehydratase (DH) and enoyl reductase (ER) domains, and genes coding for modifier enzymes, such as ABC transporter, cytochrome P450 monooxygenase, ferredoxin, thioesterase, sugar synthetic protein, FAD-dependent monooxygenase, 4-amino-4-deoxychorismate (ADC) synthase and ADC lyase. The gene base sequence according to the present invention can be used to increase the productivity of the existing FR-008 polyketides or produce new FR-008 polyketides, through modification of its parts.
摘要:
The present invention relates to an in silico method for improving an organism on the basis of the flux sum (φ) of metabolites, and more particularly to a method for screening key metabolites that increase the production yield of a useful substance, the method comprising defining the metabolite utilization of an organism for producing a useful substance as flux sum and perturbing the flux sum, as well as a method for improving an organism producing a useful substance, the method comprising deleting and/or amplifying genes associated with the aforementioned screened key metabolites. According to the present invention, the correlation between specific metabolites and useful substance production can be exactly predicted, so that it is possible to develop an organism having increased useful substance production by introducing and/or amplifying and/or deleting genes expressing enzymes associated with the specific metabolites. In addition, it is also possible to increase the production of a useful substance by adding specific metabolites during culture.
摘要:
The present invention is related to a method for improving a strain on the basis of in silico analysis, in which it compares the genomic information of a target strain for producing a useful substance to the genomic information of a strain overproducing the useful substance so as to primarily screen genes unnecessary for the overproduction of the useful substance, and then to secondarily screen genes to be deleted through performing simulation with metabolic flux analysis. According to the present invention, an improved strain can be effectively constructed by the metabolic and genetic engineering approach comprising comparatively analyzing the genomic information of a target strain for producing a useful substance and the genomic information of a strain producing a large amount of the useful substance to screen candidate genes and performing in silico simulation on the screened candidate genes to select a combination of genes to be deleted, which shows an improvement in the production of the useful substance. Accordingly, the time, effort and cost required for an actual wet test can be significantly reduced.
摘要:
Provided are novel rumen bacterial mutants resulted from the disruption of a lactate dehydrogenase gene (ldhA) and a pyruvate formate-lyase gene (pfl) from rumen bacteria; a novel bacterial mutant (Mannheimia sp. LPK7) having disruptions of a ldhA, a pfl,a phosphotransacetylase gene (pta), and a acetate kinase gene (ackA); a novel bacterial mutant (Mannheimia sp. LPK4) having disruptions of a ldhA, a pfl, and a phosphoenolpyruvate carboxylase gene (ppc) involved in the immobilization of CO2 in a metabolic pathway of producing succinic acid; and a method for producing succinic acid, characterized by culture of the above mutants in anaerobic conditions. The bacterial mutants have the property of producing succinic acid at high concentration while producing little or no organic acids, as compared to the prior wild-type strains of producing various organic acids. Thus, the bacterial mutants are useful as strains for the industrial production of succinic acid.
摘要:
A method for producing target proteins by deleting or amplifying ibpA and/or ibpB genes coding for inclusion body-associated proteins. Two methods for producing target proteins using ibpA and/or ibpB genes coding for inclusion body-associated proteins of E. coli are described. The first method enhances the secretory production and activity of target proteins using ibpA and/or ibpB genes-deleted bacteria. The second method enhances the production of target proteins in the cytoplasm and also converts the target proteins from soluble form to insoluble inclusion body, using ibpA and/or ibpB gene-amplified bacteria.
摘要:
The present invention relates to a composition containing sHSPs for prevention of protein degradation and a composition for two-dimensional (2-D) gel electrophoresis. Furthermore, the present invention relates to the improved method of 2-D gel electrophoresis, which is characterized by using sHSPs. According to the present invention, decreasing of protein spots was prevented in the 2-D gel electrophoresis, thereby obtaining 2-D gel with much more protein spots.
摘要:
The present invention relates to expression vectors containing a gene encoding outer membrane protein C(OmpC) from Escherichia coli as a cell surface anchoring motif, more specifically, to expression vectors comprising a gene encoding OmpC which is designed to express a gene of foreign protein in fused form with OmpC on the cell surface of Escherichia coli, and a method for displaying the desired protein on the surface of the bacteria employing the OmpC as a cell surface anchoring motif. In accordance with the present invention, the desired protein can be expressed efficiently on the cell surface of bacteria so that the expressed protein can be applied to a variety of applications such as live vaccine development, peptide libraries screening, antibody production, environmental bioadsorbent, whole cell catalysis, and biosensor development.
摘要:
Provided is a method of preparing polylactate (PLA) or a copolymer thereof using a mutant microorganism in which a gene participating in a coenzyme A (CoA) donor- and lactate-producing pathway is genetically manipulated to increase the productivity of a CoA donor and lactate. Amounts of the CoA donor and the lactate are simultaneously increased in a microbial metabolic pathway to enable effective biosynthesis of PLA and a hydroxyalkanoate-lactate copolymer having a high content of lactate, which is industrially useful.
摘要:
The present invention relates to recombinant microorganisms having an increased ability to produce butanol, and a method of producing butanol using the same. More specifically, the invention relates to recombinant microorganisms whose ability to produce butanol was increased by manipulation of their metabolic networks, and a method of producing butanol using the same. The recombinant microorganisms having an increased ability to produce butanol comprise a deletion of a gene, which encodes an enzyme that converts acetyl CoA to acetate, in host microorganisms having genes that encode enzymes involved in acetyl CoA and butyryl CoA biosynthetic pathway. The recombinant microorganisms obtained by manipulating the metabolic flux of microorganisms are able to selectively produce butanol with high efficiency, and thus are useful as microorganisms for producing industrial solvents and transportation fuels.