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- W2019600384 abstract "Gamma-aminobutyric acid (GABA) aminotransferase (gabT) and succinic semialdehyde dehydrogenase (gabD) genes from Pseudomonas fluorescens KCCM 12537 were cloned into a single pETDuet-1 vector and co-expressed in Escherichia coli BL21(DE3) simultaneously. The mixture of both enzymes, called GABase, is the key enzyme for the enzymatic analysis of GABA. The molecular mass of the GABA aminotransferase and succinic semialdehyde dehydrogenase were determined to be 52.8 and 46.7 kDa following computations performed with the pI/Mw program, respectively. The GABase activity between pH 6.0 and 9.0 for 24 h at <TEX>$4^{circ}C$</TEX> remained over 75%, but under pH 6.0 decreased rapidly. The GABase activity between 25 and <TEX>$35^{circ}C$</TEX> by the treatment at pH 8.6 for 30 min remained over 80%, but over <TEX>$35^{circ}C$</TEX> decreased rapidly. When the activity against GABA was defined as 100%, the purified GABase activity against 5-aminovaleric acid having a similar structure to GABA showed 47.7% and GABase activity against <TEX>${beta}$</TEX>-alanine, <TEX>${varepsilon}$</TEX>-amino-n-caproic acid, <TEX>$_L$</TEX>-ornithine, <TEX>$_L$</TEX>-lysine, and <TEX>$_L$</TEX>-aspartic acid showed between 0.3 to 2.3%. The GABA content was analyzed with this co-expressed GABase, compared with the other GABase which was available commercially. As a result, the content of GABA extracted from brown rice, dark brown rice, and black rice were <TEX>$26.4{pm}3.5$</TEX>, <TEX>$40.5{pm}4.7$</TEX> and <TEX>$94.7{pm}9.3{mu}g/g$</TEX>, which were similar data of other GABase in the error ranges." @default.
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- W2019600384 date "2013-06-30" @default.
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- W2019600384 title "Co-expression of Gamma-Aminobutyrate Aminotransferase and Succinic Semialdehyde Dehydrogenase Genes for the Enzymatic Analysis of Gamma-Aminobutyric Acid in Escherichia Coli" @default.
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- W2019600384 doi "https://doi.org/10.3839/jabc.2013.015" @default.
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