Activities | Families | Sequences | Fold types | References | Help
B6db references: 10952004

type Journal Article
authors Liu, J. Q.; Odani, M.; Yasuoka, T.; Dairi, T.; Itoh, N.; Kataoka, M.; Shimizu, S.; Yamada, H.
title Gene cloning and overproduction of low-specificity D-threonine aldolase from Alcaligenes xylosoxidans and its application for production of a key intermediate for parkinsonism drug
journal Appl Microbiol Biotechnol
sel selected
ui 10952004
year (2000)
volume 54
number 1
pages 44-51
keywords Alcaligenes/*enzymology
abstract The dtaAX gene encoding a pyridoxal 5'-phosphate (pyridoxal-P)- dependent low-specificity D-threonine aldolase was cloned from the chromosomal DNA of Alcaligenes xylosoxidans IFO 12669. It contains an open reading frame consisting of 1,134 nucleotides corresponding to 377 amino acid residues. The predicted amino acid sequence displayed 54% identity with that of D-threonine aldolase from gram-positive bacteria Arthrobacter sp. DK-38, but showed no significant similarity with those of other known pyridoxal-P enzymes. This gram-negative bacterial enzyme was highly overproduced in recombinant Escherichia coli cells, and the specific activity of the enzyme in the cell extract was as high as 18 U/mg (purified enzyme 38.6 U/mg), which was 6,000 times higher than that from the wild-type Alcaligenes cell extract. The recombinant enzyme was thus feasibly purified to homogeneity by ammonium sulfate fractionation and DEAE-Toyopearl chromatography steps. The recombinant low-specificity D-threonine aldolase was shown to be an efficient biocatalyst for resolution of L-beta-3,4-methylenedioxyphenylserine, an intermediate for production of a therapeutic drug for Parkinson's disease.
last changed 2010/06/07 18:02

B6db references