Mass spectrometric evidence for neuropeptide-amidating enzymes in Caenorhabditis elegans.

{"sci_version": "1.2", "schema": "https://corpus.bntrg.co.uk/sci/1.0/sci.schema.json", "id": "pmid:29487130", "kind": "science-record", "revision": 2, "content_hash": "sha256:683571f286697efa87c912737de542246f1b0fac762d28b8d1aeb0ce196f0a4a", "created_at": "2026-11-01T15:40:32Z", "updated_at": "2026-11-01T18:49:19Z", "generator": {"name": "corpus-assay-engine", "run_id": "reading-sci-2026-11-01"}, "paper": {"state": "complete", "title": "Mass spectrometric evidence for neuropeptide-amidating enzymes in Caenorhabditis elegans.", "doi": "10.1074/jbc.RA117.000731", "pmid": "29487130", "authors": ["Sven Van Bael", "Jan Watteyne", "Kurt Boonen", "Wouter De Haes", "Gerben Menschaert", "Niels Ringstad", "H Robert Horvitz", "Liliane Schoofs", "Steven J Husson", "Liesbet Temmerman"], "journal": "The Journal of biological chemistry", "year": 2018, "abstract": "Neuropeptides constitute a vast and functionally diverse family of neurochemical signaling molecules and are widely involved in the regulation of various physiological processes. The nematode Caenorhabditis elegans is well-suited for the study of neuropeptide biochemistry and function, as neuropeptide biosynthesis enzymes are not essential for C. elegans viability. This permits the study of neuropeptide biosynthesis in mutants lacking certain neuropeptide-processing enzymes. Mass spectrometry has been used to study the effects of proprotein convertase and carboxypeptidase mutations on proteolytic processing of neuropeptide precursors and on the peptidome in C. elegans However, the enzymes required for the last step in the production of many bioactive peptides, the carboxyl-terminal amidation reaction, have not been characterized in this manner. Here, we describe three genes that encode homologs of neuropeptide amidation enzymes in C. elegans and used tandem LC-MS to compare neuropeptides in WT animals with those in newly generated mutants for these putative amidation enzymes. We report that mutants lacking both a functional peptidylglycine α-hydroxylating monooxygenase and a peptidylglycine α-amidating monooxygenase had a severely altered neuropeptide profile and also a decreased number of offspring. Interestingly, single mutants of the amidation enzymes still expressed some fully processed amidated neuropeptides, indicating the existence of a redundant amidation mechanism in C. elegans All MS data are available via ProteomeXchange with the identifier PXD008942. In summary, the key steps in neuropeptide processing in C. elegans seem to be executed by redundant enzymes, and loss of these enzymes severely affects brood size, supporting the need of amidated peptides for C. elegans reproduction.", "claims": [{"id": "claim-target-result", "statement": "No statistical method or numerical statistical result is stated in the abstract. The source data route is ProteomeXchange, identifier PXD008942. The headline result is that loss of both a functional peptidylglycine α-hydroxylating monooxygenase and a peptidylglycine α-amidating monooxygenase severely altered the neuropeptide profile and decreased offspring, while single mutants retained some fully processed amidated neuropeptides.", "kind": "qualitative", "target": null, "evidence": [{"asset": "source:pmid:29487130", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "We report that mutants lacking both a functional peptidylglycine α-hydroxylating monooxygenase and a peptidylglycine α-amidating monooxygenase had a severely altered neuropeptide profile and also a decreased number of offspring."}, {"asset": "source:pmid:29487130", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "Interestingly, single mutants of the amidation enzymes still expressed some fully processed amidated neuropeptides, indicating the existence of a redundant amidation mechanism in C. elegans."}, {"asset": "source:pmid:29487130", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "All MS data are available via ProteomeXchange with the identifier PXD008942."}], "state": "complete"}], "gaps": []}, "experiment": {"state": "partial", "objective": "No statistical method or numerical statistical result is stated in the abstract. The source data route is ProteomeXchange, identifier PXD008942. 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