In this study, we have isolated a rice (Oryza sativa L.) glutamate decarboxylase (RicGAD) clone from a root cDNA library, using a partial Arabidopsis thaliana GAD gene as a probe. The rice root cDNA library was constructed with mRNA, which had been derived from the roots of rice seedlings subjected to phosphorus deprivation. Nucleotide sequence analysis indicated that the RicGAD clone was 1,712...

1. l-Glutamate decarboxylase (EC 4.1.1.15) from Clostridium perfringens was inactivated by exposure to visible light at pH6.2. 2. Inactivation does not occur at pH4.6 or in the absence of bound pyridoxal phosphate. 3. On prolonged photo-oxidation six histidine residues per molecule of enzyme were destroyed. 4. The loss of six cysteine residues per molecule occurred both in irradiated samples an...

Enzymatic properties of glutamate decarboxylase (GAD) [EC4.1.1.15] obtained from the fruiting body of Flammulina velutipes were evaluated via protein isolation, purification, and characterization. To investigate the anatomical localization of GAD, crushed fruiting bodies were centrifuged; the supernatant and precipitate were subsequently subjected to enzyme reaction. GAD activity of the precipi...

Glutamic acid decarboxylase (GAD;E.C. 4.1.1.15) catalyzes the production of GABA, the major inhibitory neurotransmitter in the mammalian brain. We recently isolated a lambda gt-11 recombinant, lambda-GAD, that contains the cDNA for GAD from feline brain (Kaufman et al., 1986). Interestingly, the beta-galactosidase-GAD fusion protein encoded by lambda GAD is enzymatically active, catalyzing the ...

The time and pattern of appearance of glutamic acid decarboxylase (glutamate decarboxylase; EC 4.1.1.15) (GAD) mRNA during the development of the rat brain were analyzed. RNA transfer blot analysis of poly(A)+ RNA from whole brain shows that a 3.7-kilobase transcript is the most abundant form of the message from embryonic day 15 (E15) through adulthood. By E15 this form is present at about 50% ...

Gamma‐aminobutyric acid (GABA) possibly plays a causative role in mood disorders. This hypothesis originated with studies on the beneficial effect of valproate in mania and as a mood stabilizer. Since valproate is known for its action in increasing the level of GABA, it was indirectly suggested that decreasing levels of GABA were responsible for mood alterations. To identify factors causing the...

1. A seven-step procedure for preparing highly purified glutamate decarboxylase from Clostridium perfringens is described. 2. The homogeneity of the pure enzyme was established by sucrose-density-gradient centrifugation and starch-gel electrophoresis. 3. The isoelectric point of the pure enzyme is about pH4.5 and the molecular weight is 290000. 4. The pH optimum for activity is 4.7. The pure en...