摘要:
The present invention relates to a poly-gamma-glutamate (PGA) having an ultra-high molecular weight greater than 5,000 kDa. The ultra-high molecular weight PGA according to the present invention has a mean molecular weight greater than 13,000 kDa, and more than 95% of its molecules have a molecular weight ranging from 3,000 to 15,000 kDa. Also, it can be produced by the culturing of Bacillus subtilis var. chungkookjang. The ultra-high molecular weight PGA according to the present invention shows very excellent moisture-absorbing, moisture-retaining, sustained release, mineral solubility, and water-absorbing properties, and thus, can be used as a new and high value-added material in various applications.
摘要:
Promoters capable of expressing a gene at a high level without inducing the gene expression; recombinant DNAs; vectors for gene expression; expression vectors; transformed cells; a process for producing a protein which can be conveniently performed at a low cost; and a kit therefor. Namely, an isolated DNA having a base sequence represented by SEQ ID NO:1 or 2 in Sequence Listing or its fragment showing a constitutive promoter activity in Escherichia coli or bacteria belonging to the genus Bacillus ; an isolated DNA hybridizable with the above DNA and showing a constitutive promoter activity in Escherichia coli or bacteria belonging to the genus Bacillus ; a recombinant DNA wherein the above DNA and a foreign gene are provided in such a state as enabling the expression of the foreign gene; a vector for gene expression which contains at least the above DNA; an expression vector containing the above recombinant DNA; a transformed cells carrying the above recombinant DNA or the above expression vector; a process for producing a protein which comprises culturing the above transformed cell and collecting the protein from the culture medium thus obtained; and a kit for producing a protein which contains at least the above DNA or the above vector for gene expression.