@article{KlotzLohseSchwabe1986, author = {Klotz, Karl-Norbert and Lohse, M. J. and Schwabe, U.}, title = {Characterization of the solubilized A\(_1\) adenosine receptor from rat brain membranes}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-60222}, year = {1986}, abstract = {A\(_1\) adenosine receptors from rat brain membranes were solubilized with the zwitterionic detergent 3-[3-( cholamidopropyl)dimethylammonio]-1-propanesulfonate. The solubilized receptors retained all the characteristics of membrane-bound A\(_1\) adenosine receptors. A high and a low agonist affinity state for the radiolabelled agonist (R)-\(N^6\)-[\(^3\)H]phenylisopropyladenosine([\(^3\)H]PJA) with K\(_D\) values of 0.3 and 12 nM, respectively, were detected. High-affinity agonist binding was regulated by guanine nucleotides. In addition agonist binding was still modulated by divalent cations. The solubilized A\(_1\) adenosine receptors could be labelled not only with the agonist [\(^3\)H]PIA but also with the antagonist I ,3-diethyi-8-[\(^3\)H]phenylxanthine. Guanine nucleotides did not affect antagonist binding as reported for membrane-bound receptors. These results suggest that the solubilized receptors are still coupled to the guanine nucleotide binding protein N; and that all regulatory functions are retained on solubilization. Key Words: A1 adenosine receptors - Solubilization- Rat brain membranes. Klotz K.-N. et al. Characterization of the solubilized A1 adenosine receptor from rat brain membranes. J. Neurochem. 46, 1528-1534 (1986).}, subject = {Toxikologie}, language = {en} } @article{LohseKlotzUkenaetal.1984, author = {Lohse, M. J. and Klotz, K.-N. and Ukena, D. and Schwabe, U.}, title = {Characterization of \([^3H]\)Phenobarbital Binding to Rat Brain Membranes}, series = {Neuroscience Letters}, volume = {52}, journal = {Neuroscience Letters}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-127894}, pages = {97-101}, year = {1984}, abstract = {The binding of \([^3H]\)phenobarbital to rat brain membranes was studied in order to determine its characteristics and specificity. The binding reaction was rapid and occurred at sites of low affinity. \((K_d = 700 μM)\) and very high density \((B_{max} = 2.7 nmoll/mg protein)\). It was unaffected by temperature changes from O°C to 95°C and was maximal at pH 5. Detergents in low concentrations markedly decreased the binding, apparently without solubilizing the binding sites. It is concluded that the binding of \([^3H]\) phenobarbital is a rather non-specific interaction with the plasma membrane.}, language = {en} }