Abstract

Summary A β-endorphin analog with replacement of glutamic acid in position 8 by glutamine has been synthesized by modified procedures of the solid-phase method. The analgesic potency of the synthetic analog was increased to nearly three-fold with a concomitant increase of opiate receptor-binding activity in neuroblastoma × glioma hybrid cells. This is the first instance in which a replacement of a single amino acid causes an increase of analgesic potency of β-endorphin.

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