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Mytilus edulis hemolymph contain prodynorphin
G B Stefano1, B Salzet-Raveillon, M Salzet
1Multidisciplinary Center for the Study of Aging, State University of New York, College at Old Westbury, 11568-0210, USA.
Abstract:
We have characterized a prodynorphin (prodyn) molecule in hemocytes and hemolymph of the bivalve mollusk Mytilus edulis. The ca. 16-kDa protein was purified by cut-off filtration prepurification, anti-leucine-enkephalin affinity column separation followed by reversed-phase HPLC. Its primary sequence was determined by Edman degradation, endoproteinase Glu-C digestion and CNBr treatment. Mytilus prodyn contains, alpha-neo-endorphin, dynorphin-A and dynorphin-B at the C-terminus, exhibiting 100, 70.5 and 85% of identity with the rat prodyn-derived counterparts, respectively. The number of leucine-enkephalins in this precursor is identical to that found in vertebrates. Mytilus prodyn is distinguished from that found in leeches in that the N-terminus is longer. Additionally, by sequence comparison, the presence of an orphanin FQ-like peptide, exhibiting 50% sequence similarity with that found in mammals, is demonstrated. This report constitutes the first complete biochemical characterization of a prodyn in a non-parasitic invertebrate and mollusk.
Insights
Researchers identified and characterized a novel prodynorphin (prodyn) molecule in the marine mollusk Mytilus edulis. This study details the biochemical properties and sequence of this important invertebrate opioid precursor.
Area of Science:
- Biochemistry
- Molecular Biology
- Marine Biology
Background:
- Opioid peptides play crucial roles in various physiological processes.
- Prodynorphin (prodyn) is a precursor to several bioactive opioid peptides, including dynorphins and enkephalins.
- Understanding prodyn diversity across species provides insights into opioid system evolution.
Purpose of the Study:
- To perform the first complete biochemical characterization of a prodyn molecule in a mollusk.
- To elucidate the structure and sequence of the Mytilus edulis prodyn (Mytilus prodyn).
- To compare Mytilus prodyn with its counterparts in vertebrates and other invertebrates.
Main Methods:
- Purification of the ca. 16-kDa protein from Mytilus edulis hemocytes and hemolymph using filtration, affinity chromatography, and reversed-phase HPLC.
- Determination of the primary amino acid sequence via Edman degradation, endoproteinase Glu-C digestion, and CNBr treatment.
- Sequence comparison with known prodyn sequences from other species.
Main Results:
- The Mytilus prodyn precursor contains alpha-neo-endorphin, dynorphin-A, and dynorphin-B at the C-terminus, showing high sequence identity to rat prodyn.
- The number of leucine-enkephalin sequences within the precursor is conserved compared to vertebrates.
- Mytilus prodyn possesses a longer N-terminus than leech prodyn and contains an orphanin FQ-like peptide with 50% similarity to mammalian forms.
Conclusions:
- This study provides the first comprehensive biochemical characterization of a prodyn in a non-parasitic invertebrate and mollusk.
- The findings reveal conserved and divergent features of prodyn structure and function across diverse animal phyla.
- Mytilus prodyn represents a valuable model for studying opioid peptide evolution and function in invertebrates.