Journal
JOURNAL OF NATURAL PRODUCTS
Volume 79, Issue 11, Pages 2838-2845Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.6b00601
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Funding
- German Centre for Infection Research (DZIF)
- Ministry of Higher Education of government of Egypt
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The marine-sponge-derived fungus Stachylidium sp. 293 K04 produces the N-methylated peptides endolide A (1) and endolide B (2), showing affinity for the vasopressin receptor 1A and serotonin receptor 5HT(2B), respectively. Both peptides feature the rare amino acid 3-(3-furyl)alanine. Isotope labeling experiments, employing several C-13-enriched precursors, revealed that this unprecedented heterocyclic amino acid moiety in endolide A (1) is synthesized from a cyclic intermediate of the shikimate pathway, but not from phenylalanine. Two new tetrapeptide analogues, endolides C and D (3 and 4), were characterized, as well as the previously described hirsutide (5).
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