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Y-Aminobutyric Acid Uptake by a Bacterial System With Proc. Nati. Acad. Sci. USA Vol. 86, pp. 7378-7381, October 1989 Biochemistry y-Aminobutyric acid uptake by a bacterial system with neurotransmitter binding characteristics (muscimol/type A y-aminobutyric acid receptor/Pseudomonas fluorescens) GEORGE D. GUTHRIE* AND CATHERINE S. NICHOLSON-GUTHRIEt *Department of Biochemistry, tSchool of Medicine, Indiana University, 700 Drexel Drive, Evansville, IN 47712 Communicated by Robert L. Sinsheimer, July 3, 1989 (received for review February 13, 1989) ABSTRACT y-Aminobutyric acid (GABA), an amino soak as judged by their stable OD and retention of motility. acid, has been found in every class of living organisms. In Ten milliliters of cells was centrifuged at 1200 X g for about higher organisms, GABA is a neurotransmitter and binds with 3 sec to remove debris; 5 ml of cell suspension was removed, high affinity and specificity to GABA receptors on neurons in centrifuged (3000 x g, 10 min), washed twice with Tris citrate a sodium-independent reaction that is saturable. The role of buffer, resuspended to an OD of 0.15, and resoaked for 1 hr. GABA in organisms lacking nervous tissue is not known. This GABA Assay. Preliminary chase experiments with unla- report describes, in a strain of Pseudomonas fluorescens, a beled GABA showed that the radioactivity remained bound GABA uptake system with binding characteristics like those of after a chase. Hence, direct measurement of GABA binding the GABA (type A) brain receptor. The binding was saturable to determine a dissociation constant (Kd) was not possible. and specific for GABA, was sodium-independent, was of high Consequently, the GABA assay was designed to measure the affinity (Km = 65 nM), and was inhibited competitively by Michaelis constant (Kin) from which characteristics of the muscimol, a potent GABA analogue. The bacterial GABA affinity and saturation of the GABA binding site of the system included a homogeneous binding site, and no cooper- bacterial system could be inferred. ative interaction was found between sites. To our knowledge, For the standard [3H]GABA assay, 100 A.l of the cell such a system for GABA, or other neurotransmitters, in a suspension (OD = 0.15) was added to triplicate 900-A.l samples bacterium has not been reported. of 10 mM KPO4 buffer (pH 7.3, 250C) containing GABA solutions, and the samples were incubated with shaking for 5 min. Under these conditions, initial velocities could be deter- y-Aminobutyric acid (GABA) is the major inhibitory neuro- mined by direct measurement because the rate of uptake of transmitter in the central nervous system ofinvertebrates and GABA was constant and maximal incorporation was -5% of vertebrates and causes depressant actions in the brain (1-5). the total available GABA in the assay solution. Nonspecific In vivo, GABA exerts its effect on neurons by binding to a activity (background) was determined by including 1 mM GABA type A (GABAA) receptor and regulating nerve trans- unlabeled GABA in samples. The reaction was terminated by mission through a chloride ion channel mechanism (1-5). In vacuum filtration of samples and collection of the cells on vitro, a standard assay for measuring GABA receptors in- membrane filters (0.45-,um Millipore HA) presoaked in ultra- volved in transmission of the nerve impulse in higher orga- pure water. Each filter with retained cells was immediately nisms consists of direct labeling of receptors in brain mem- washed three times with 3 ml of ice-cold 10 mM KPO4 (pH brane fractions by using high specific activity [3H]GABA in 7.3), oven dried (100°C), and dissolved in 2 ml ofethyl acetate. a sodium-free solution (6). Ten milliliters of toluene Spectrafluor was added, and the By using a modification of the standard GABA assay for radioactivity was determined by liquid scintillation spectrom- brain membranes, uptake of GABA by a strain of Pseudo- etry. monas fluorescens was studied. We report the finding of a Protein Assay. Protein was measured by the method of high-affinity GABA system in this bacterium with binding Lowry et al. (9). properties similar to those of a brain receptor (1, 6, 7). RESULTS MATERIALS AND METHODS Characteristics of the GABA System. Specific GABA up- Organism, Growth, and Preparation. The bacterium was take was saturable and was -94% of the total activity (Fig. isolated by one of us (C.S.N.-G.) and identified as a strain of 1). A Lineweaver-Burk analysis (see Fig. 3, control line) P. fluorescens by the Indiana State Board of Health. Growth showed that the GABA system included a single, high-affinity and preparation of cells were done at room temperature binding site with a Km of 65 + 3 nM (based on five experi- (23-25°C). Cells were grown with vigorous stirring, in a ments). Hill plots (data not shown) gave an average coeffi- medium of high salts (8) plus 9 mM NH4Cl, 34 mM succinic cient of 1.14, suggesting no positive or negative cooperative acid, Difco yeast extract (0.2 g/liter), and 58 mM Tris interaction between GABA binding sites. buffered to pH 7.0 with NaOH, to an OD540 of 1.0-1.7 (1-cm Muscimol Effects on GABA Activity. Muscimol, a com- path length). The cells were harvested by centrifugation (3000 pound isolated from mushrooms and one of the most potent x g, 10 min), washed twice with Tris citrate buffer (47.5 mM GABA agonists (binds to the receptor and enhances effects) Tris/8.3 mM K2HPO4/5.3 mM KH2PO4 adjusted to pH 7.4 in invertebrates and vertebrates, is widely used to study with citric acid), resuspended to an OD of 1.0, and soaked for GABA binding in brain membranes (1, 6, 10, 11). It binds 21-27 hr. While nonsoaked cells showed high-affinity GABA specifically to GABAA sites on nerves and causes neurolog- activity, the overnight soak reduced scatter, and data were ical effects in higher organisms (1, 6, 11). more reproducible. Cells were not damaged by the overnight Fig. 2 shows that unlabeled muscimol and GABA com- peted with [3H]GABA in a similar manner, demonstrating The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" Abbreviation: GABA, y-aminobutyric acid. in accordance with 18 U.S.C. §1734 solely to indicate this fact. *To whom reprint requests should be addressed. 7378 Downloaded by guest on September 26, 2021 Biochemistry: Guthrie and Nicholson-Guthrie Proc. Natl. Acad. Sci. USA 86 (1989) 7379 1.1,6- .0 a ° 1.1,2 O3 v <to E O.~ ° .4 0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~I I- 0 100 200 300 400 500 600 GABA, nM -0.02 -0.01 0 0.01 0.02 0.03 FIG. 1. Saturation ofGABA uptake in P.fluorescens. [3H]GABA 1/GABA, nM-1 bound is the amount of [3H]GABA solution either specifically taken up by the cells or nonspecifically associated with the cells or filter FIG. 3. Lineweaver-Burk plot showing competitive inhibition of after the standard 5-min incubation. The [3H]GABA solutions were GABA by muscimol in P. fluorescens. Cells were incubated with one part [3H]GABA (50-71.5 Ci/mmol) and nine parts unlabeled radiolabeled GABA solutions (as described in the legend to Fig. 1) GABA (recrystallized twice from ethanol). Total (e) = specific + and 0 (e), 40 (o), or 80 (A) nM unlabeled muscimol. Initial velocities nonspecific (o) GABA. Standard deviations, if measurable, are (vo) were calculated from the incorporation measured after the shown by bars. Similar results were obtained when the experiment standard 5-min incubation. A typical curve from four separate was repeated four times. experiments is shown. that muscimol was interacting directly with the GABA sys- noncompetitive inhibitor in invertebrate neurons (4, 10). tem. As reported for brain membranes (12), muscimol was a Picrotoxin, a potent GABAA antagonist, interacts with the competitive inhibitor ofGABA (Fig. 3), further supporting its chloride ion channel of the. GABA receptor complex in direct interaction. Since the GABA uptake system was invertebrates and vertebrates but not with the site where saturable and competitively inhibited by muscimol, a specific GABA binds (4, 10, 14). Baclofen is a potent, selective GABA binding site was indicated. Furthermore, since mus- agonist of another GABA receptor, type B (GABAB), but is cimol replaced 100% of the GABA molecules, it was inter- inactive at the GABAA site; GABAB, found only in verte- acting with all exposed GABA binding sites (Fig. 2). The Ki brates, acts by modifying the entry ofcalcium into the neuron for muscimol estimated from Fig. 3 was 34 nM. Although (4, 6, 10). Of these compounds, only the GABAA agonists muscimol proved to inhibit better than unlabeled GABA showed any activity in Pseudomonas as GABA competitors. (Table 1), the IC50 values ofboth compounds were within the In higher organisms, GABA is removed from the extracel- range for those reported for brain membranes (not treated lular synaptic region to inside the neuron by a low-affinity, with detergent) (6). sodium-dependent uptake system, which is inhibited by GABA Competition by Agonists, Antagonists, and Ana- nipecotic acid but not by muscimol (3, 15, 16). Nipecotic acid, logues. To gain a better understanding ofthe bacterial GABA which is inactive on both GABAA and GABAB binding sites system and its binding site, compounds known to interact (6), was not effective in inhibiting [3H]GABA uptake in the with the GABA receptor in the central nervous system of bacterium. higher organisms were tested for their activity as GABA To determine if GABA was interacting with a nonspecific competitors (Table 1). Isoguvacine, 3-amino-propanesulfonic rather than a specific GABA site, amino acids that have a acid, kojic amine, /3-alanine, and imidazole-4-acetic acid are structural resemblance to GABA and have well-defined bac- GABAA agonists in brain (4, 14).
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