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- W2391479155 abstract "We have characterized the binding of 125I-labeled human beta-endorphin (125I-beta H-endorphin) to sites present on the terminal fluid-phase complex of human complement, consisting of complement components C5b, C6, C7, C8, C9, and the S-protein (SC5b-9 complex). Specific binding exhibited saturability, reversibility, structural specificity, temperature dependence, and absence of negative cooperative effects. Binding was maximal at 4 degrees C and pH 7.0; it was diminished by monovalent and divalent cations as well as by increasing concentrations of urea and Triton X-100 and apparently required intact disulfide groups. Binding was not inhibited by a number of opioid peptides sharing common sequences with the NH2 terminus of beta H-endorphin. In contrast, binding was inhibited by beta H-endorphin, N-acetyl-beta H-endorphin, and a series of COOH-terminal beta H-endorphin fragments, where of the COOH-terminal dipeptide Gly-Glu represented the minimal effective structure. Stepwise extension towards the NH2 terminus led to an increased binding affinity of the respective fragment. Computer resolution of competition curves yielded one binding component for several shorter COOH-terminal beta H-endorphin fragments and for beta H-endorphin (1-5) + (16-31), whereas two distinct binding components were obtained when beta H-endorphin (27-31), beta H-endorphin (6-31), N-acetyl-beta H-endorphin or beta H-endorphin were used as inhibitors. This study presents detailed data on the binding of COOH-terminal beta H-endorphin fragments to specific nonopiate binding sites present on the terminal SC5b-9 complex of human complement. We suggest that through this interaction, beta H-endorphin may modulate certain functions within the immune system." @default.
- W2391479155 created "2016-06-24" @default.
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- W2391479155 date "1983-10-01" @default.
- W2391479155 modified "2023-09-30" @default.
- W2391479155 title "Interaction of human beta-endorphin with nonopiate binding sites on the terminal SC5b-9 complex of human complement. Significance of COOH-terminal beta H-endorphin fragments." @default.
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- W2391479155 doi "https://doi.org/10.1016/s0021-9258(17)44172-x" @default.
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