Blake J, Helmeste DM, Li CH. Beta-endorphin. Synthesis and biological activity of analogs with disulfide bridges.
INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1985;
25:575-9. [PMID:
2993181 DOI:
10.1111/j.1399-3011.1985.tb02212.x]
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Abstract
Two analogs of human beta-endorphin (beta-EP) which contain cystine bridges, [Cys15-Cys26,Phe27,Gly31]-beta-EP (I) and [Cys16-Cys26,Phe27,Gly31]-beta-EP (II), were synthesized by the solid-phase method. Peptides I and II were shown to contain 2-2.5 times the opiate receptor binding activity of beta-endorphin. We also synthesized two analogs with reduced alkylated cysteine residues and these peptides, [Arg9,19,24,28,29 Cys(Cam)11,26,Phe27,Gly31] and [Arg9,19,24,28,29,Cys-(Cam)12,26,Phe27,Gly31], were shown to have approximately the same opiate receptor activity as beta-endorphin.
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