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Unlocking the Diversity of Pyrroloiminoquinones Produced by Latrunculid Sponge Species

Overview
Journal Mar Drugs
Publisher MDPI
Specialties Biology
Pharmacology
Date 2021 Feb 2
PMID 33525412
Citations 5
Authors
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Abstract

Sponges of the Latrunculiidae family produce bioactive pyrroloiminoquinone alkaloids including makaluvamines, discorhabdins, and tsitsikammamines. The aim of this study was to use LC-ESI-MS/MS-driven molecular networking to characterize the pyrroloiminoquinone secondary metabolites produced by six latrunculid species. These are , , and as well as the recently discovered species, and . Organic extracts of 43 sponges were analyzed, revealing distinct species-specific chemical profiles. More than 200 known and unknown putative pyrroloiminoquinones and related compounds were detected, including unprecedented makaluvamine-discorhabdin adducts and hydroxylated discorhabdin I derivatives. The chemical profiles of the new species closely resembled those of the known (chemotype I), but with a higher abundance of tsitsikammamines vs. discorhabdins. sponges displayed two distinct chemical profiles, either producing mostly the same discorhabdins as (chemotype I) or non- or monobrominated, hydroxylated discorhabdins. and produced similar pyrroloiminoquinone chemistry to one another, characterized by sulfur-containing discorhabdins and related adducts and oligomers. This study highlights the variability of pyrroloiminoquinone production by latrunculid species, identifies novel isolation targets, and offers fundamental insights into the collision-induced dissociation of pyrroloiminoquinones.

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