Abstract:
PURPOSE: A high throughput screening system and a method of lactic acid-producing strains using two or more pH indicators are provided to quickly and accurately screen strains. CONSTITUTION: A high throughput screening system of lactic acid-producing strains contains the strain, a medium, and two or more pH indicators. The strains are a wild type strain, a mutant strain, and a recombinant strain. The pH indicators contain bromocresol green and methyl red in a ratio of 2:1-10:1. A method for screening the lactic acid-producing strains comprises: a step of adding the pH indicators to a medium; a step of culturing the strains; and a step of observing color change of the pH indicators, and measuring lactic acid production quantity.
Abstract:
Disclosed is modified microorganisms for simultaneous saccharification and fermentation, an expression vector for preparing the modified microorganisms, and a method for producing chemical materials using the modified microorganisms. According to one side, disclosed is modified Kluyveromyces marxianus which produces chemical materials by simultaneous saccharification and fermentation and contains a replication origin; a promoter; a gene encodes one or more cellulose decomposing enzymes selected among beta-glucosidase, endoglucanase, exoglucanase, and cellobiohydrolase; and a terminator.
Abstract:
PURPOSE: An SNR84 gene enhancing usability of galactose metabolism is provided to enhance metabolic rate of galactose and enhance productivity of bioalcohol from carbon source. CONSTITUTION: An SNR84 gene enhances galactose metabolism rate. The gene is denoted by sequence number 1. A pRS424 recombinant vector contains the SNR84 gene of sequence number 1. A transformed recombinant microorganism is obtained using the recombinant vector. The recombinant microorganism overexpresses the SNR84 gene. The microorganism is yeast. The yeast is Saccharomyces sp., Pachysolen sp., Clavispora sp., Kluyveromyces sp., Debaryomyces sp., Schwanniomyces sp., Candida sp., Pichia sp., or Dekkera sp. The deposit number KCTC 11388 BP of the recombinant microorganism is CEN.PK2-1D/pRS424-SNR84.
Abstract:
One embodiment of the present invention relates to a metabolism network model of Corynebacterium glutamicum for producing 1,4-BDO by Corynebacterium glutamicum, which is a strain that does not produce 1,4-BDO in a natural state. On the basis of the network model, metabolic properties of Corynebacterium glutamicum are analyzed. By predicting effects of a deletion target enzyme (ldhA, mqo or mdh) in a state in which Cat1, sucD, 4hbD, cat2 and adhE are included, and removing them, production efficiency of 1,4-BDO and increase of 1,4-BDO under the same fermentation conditions are confirmed. In addition, transformation microorganism produced by the method can produce 1,4-BDO in high efficiency, and therefore, can be effectively used in the industries.
Abstract:
PURPOSE: A modified microorganism with improved xylose utilization is provided to produce chemical materials. CONSTITUTION: A modified microorganism converts xylose into xylitol by xylose reductase, xylitol into xylulose by xylitol dehydrogenase, and xylulose into xylulose-5-phosphate by xylulokinase. The microorganism produces a chemical material using xylose. Xylose is converted into xylitol by xylose reductase. The xylose reductase and xylitol dehydrogenase activities are derived from Pichia stipitis. The xylulokinase activity is derived from Saccharomyces cerevisiae. The modified microorganism is E.coli or Kluyveromyces marxianus. The chemical material includes alcohol, organic acid, amino acid, or vitamin. The modified microorganism is deposited by deposit number KCTC11951BP, KCTC11952BP or KCTC11953BP.