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pubmed:abstractText |
The opioid peptide precursors, preprodynorphin and preproenkephalin show structure similarity with a transcription factor, hunchback and the putative helix-loop-helix DNA-binding proteins, lil-1, tal and twist. Segments with similarity contain the three enkephalin sequences in preprodynorphin and one in preproenkephalin which are present within heptapeptide repeats characteristic of an alpha-helical coiled-coil structure distinctive of an amphipathic helix-loop-helix DNA-binding motif. Hunchback and the opioid prohormones also have cystein-rich regions characteristic of zinc-finger domains in common.
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