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  • Title: Opioid receptor labeling with the chloromethyl ketone derivative of [3H]Tyr-D-Ala-Gly-(Me)Phe-Gly-ol (DAMGO) II: Covalent labeling of mu opioid binding site by 3H-Tyr-D-Ala-Gly-(Me)Phe chloromethyl ketone.
    Author: Oktem HA, Moitra J, Benyhe S, Toth G, Lajtha A, Borsodi A.
    Journal: Life Sci; 1991; 48(18):1763-8. PubMed ID: 1850495.
    Abstract:
    Opioid receptors of rat brain membranes were prelabeled with 3H-Tyr-D-Ala2-(Phe4)-Gly-CH2Cl, a chloromethyl ketone derivative of enkephalin, and solubilized in 1% digitonin. Hydrodynamic parameters of the receptor detergent complex derived from gel filtration and sucrose density gradient ultracentrifugation were found to be 51 A and 8.7 S, respectively, and the size was estimated to be about 200 kDa. Sodium dodecyl sulfate gel electrophoresis followed by fluorography revealed specific alkylation of a major protein at 58 kDa.
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