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• W2031330276 abstract "The sigma-type opiate receptor is a distinct binding site in the brain that may mediate some of the psychotomimetic effects caused by benzomorphan opiates and phencyclidine in humans. We have developed a synthetic, highly selective ligand for this receptor, 1,3-di-o-tolylguanidine (DTG). To identify the binding protein(s) of the sigma receptor, we have now synthesized a radiolabeled azide derivative of DTG, 1-(4-azido-2-methyl[6-3H]phenyl)-3-(2-methyl[4,6-3H]phenyl)-guanidine ([3H]N3DTG). In guinea pig brain membrane binding assays conducted in the dark, [3H]N3DTG bound reversibly, selectively, and with high affinity (Kd = 10 nM) to sigma receptors. The drug specificity profile of reversible [3H]-N3DTG binding was identical to that of [3H]DTG and 3H-labeled (+)-3-(3-hydroxyphenyl)-N-(1-propyl)piperidine binding indicating that [3H]N3DTG is a selective sigma receptor ligand. Guinea pig brain membranes were photoaffinity-labeled with [3H]N3DTG. NaDodSO4/PAGE of detergent-solubilized membrane extract identified a single 29-kDa radioactive band. Sepharose Cl-6B gel chromatography of photolabeled brain membranes solubilized with the nondenaturing detergent sodium cholate showed a radioactive complex with a Stoke's radius of 4.6 nm (Mr, 150,000) that may represent the intact sigma receptor complex. NaDodSO4/PAGE of this complex showed that the radiolabeled material was a 29-kDa polypeptide that may be the binding subunit of the sigma receptor. The specific sigma receptor photoaffinity ligand described here should be a useful tool for purifying and characterizing the sigma receptor." @default.
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• W2031330276 date "1988-04-01" @default.
• W2031330276 modified "2023-10-16" @default.
• W2031330276 title "Identification of the binding subunit of the sigma-type opiate receptor by photoaffinity labeling with 1-(4-azido-2-methyl[6-3H]phenyl)-3-(2-methyl[4,6-3H]phenyl)guanidine." @default.
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• W2031330276 doi "https://doi.org/10.1073/pnas.85.8.2844" @default.
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