Inhibitors of crayfish glutamic acid decarboxylase.

Abstract:

:Crayfish glutamic acid decarboxylase (GAD), like the homologous enzymes from other species, is inhibited by carbonyl-trapping agents (e.g. aminooxyacetic acid; AOAA) and sulfhydryl reagents (e.g. 5,5'-dithiobis-(2-nitrobenzoic acid); DTNB). It also is inhibited by the product GABA, many anions (e.g. SCN- and Cl-), and some cations (e.g. Zn+2). The inhibition by AOAA, but not that by DTNB, was prevented by increasing the concentration of the pyridoxal phosphate (PLP) coenzyme. GABA blocked the effects of PLP on enzyme activity. The inhibition by AOAA, DTNB, GABA, and chloride all were competitive with substrate. The effect of GABA occurs at physiological concentrations and may contribute to the regulation of GAD activity in vivo. The quantitative effect of anions is dependent on the cation with which they are administered. ATP stimulated GAD activity in homogenates prepared with potassium phosphate or Tris-acetate buffer, even when no exogenous PLP was provided.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Grossfeld RM,Yancey SW,Baxter CF

doi

10.1007/BF00964526

subject

Has Abstract

pub_date

1984-07-01 00:00:00

pages

947-63

issue

7

eissn

0364-3190

issn

1573-6903

journal_volume

9

pub_type

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