A Monoclonal Antibody to Rabbit Brain GABA Transaminase

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Abstract
A monoclonal antibody of class IgG (subclass IgG1) was prepared to rabbit brain GABA transaminase (GABA-T). This antibody reveals a single band of MW 52,000 on a nitrocellulose filter blotted with purified GABA-T. On a filter blotted with unfractionated rabbit brain supernatant a major band of MW 58,000 is revealed. An immunoaffinity column was prepared by coupling proteins from ascites fluid containing anti-rabbit GABA-T antibody to Bio-Rad Affi-Gel 15. This column bound purified GABA-T and extracted from unfractionated rabbit brain supernatant a protein of MW 58,000, which was almost homogeneous and which had GABA-T enzyme activity. Using immunoaffinity chromatography, a high degree of purification of GABA-T may be achieved in a single step. This technique may preserve an authentic form of the enzyme that is lost during the conventional purification procedure. The antibody inhibits GABA-T enzyme activity, up to a maximum of 35%.