Linked Life Data

9604005

Source:http://linkedlifedata.com/resource/pubmed/id/9604005

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1998-8-17
pubmed:databankReference
pubmed:abstractText
We found glutamate racemase activity in cell extracts of Bacillus subtilis IFO 3336, which abundantly produces poly-gamma-glutamate. The highest activity was obtained in the early stationary phase of growth. The racemase was purified to homogeneity. The enzyme was a monomer with a molecular mass of about 30 kDa and required no cofactor. It almost exclusively catalyzed the racemization of glutamate; other amino acids, including alanine and aspartate but not homocysteinesulfinate, were inactive as either substrates or inhibitors. Although the Vmax value of the enzyme for L-glutamate is 21-fold higher than that for D-glutamate, the Vmax/Km value for L-glutamate is almost equal to that for the D-enantiomer. The racemase gene, glr, was cloned into Escherichia coli cells and sequenced. The racemase was overproduced in the soluble fraction of the E. coli clone cells with the substitution of ATG for TTG, the initial codon of the glr gene. D-Amino acid aminotransferase activity was not detected in Bacillus subtilis IFO 3336 cells. B. subtilis CU741, a leuC7 derivative of B. subtilis 168, showed lower glutamate racemase activity and lower productivity of poly-gamma-glutamate than B. subtilis IFO 3336. These results suggest that the glutamate racemase is mainly concerned in D-glutamate synthesis for poly-gamma-glutamate production in B. subtilis IFO 3336.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0021-924X
pubmed:author
pubmed:issnType
Print
pubmed:volume
123
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1156-63
pubmed:dateRevised
2007-12-19
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Properties of glutamate racemase from Bacillus subtilis IFO 3336 producing poly-gamma-glutamate.
pubmed:affiliation
Research Institute of Molecular Genetics Kansai University, Suita, Osaka, 564-0073, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't