Isolation and structure of pro-methionine-enkephalin: Potential enkephalin precursor from porcine hypothalamus
- 1 December 1979
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 76 (12) , 6177-6180
- https://doi.org/10.1073/pnas.76.12.6177
Abstract
A hexapeptide that we have named pro-methionine-enkephalin has been isolated from acid extracts of porcine hypothalami and found to have the amino acid sequence H-Tyr-Gly-Gly-Phe-Met(O)-Arg-OH. This peptide is not a fragment of either porcine β-lipotropin or β-endorphin, which suggests that it could be a precursor of [Met]enkephalin in the brain by a pathway differing from the one usually postulated. The existence of still larger precursors of [Met]enkephalin, perhaps related to the recently reported α-neo-endorphin, is strongly implied by these studies. Synthetic H-Tyr-Gly-Gly-Phe-Met-Arg-OH exhibited low, but significant, opiate activity in vitro .Keywords
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