Abstract:
:Cyclic imine toxins are neurotoxic, macrocyclic compounds produced by marine dinoflagellates. Mass spectrometric screenings of extracts from natural plankton assemblages revealed a high chemical diversity among this toxin class, yet only few toxins are structurally known. Here we report the structural characterization of four novel cyclic-imine toxins (two gymnodimines (GYMs) and two spirolides (SPXs)) from cultures of Alexandrium ostenfeldii. A GYM with m/z 510 (1) was identified as 16-desmethylGYM D. A GYM with m/z 526 was identified as the hydroxylated degradation product of (1) with an exocyclic methylene at C-17 and an allylic hydroxyl group at C-18. This compound was named GYM E (2). We further identified a SPX with m/z 694 as 20-hydroxy-13,19-didesmethylSPX C (10) and a SPX with m/z 696 as 20-hydroxy-13,19-didesmethylSPX D (11). This is the first report of GYMs without a methyl group at ring D and SPXs with hydroxyl groups at position C-20. These compounds can be conceived as derivatives of the same nascent polyketide chain, supporting the hypothesis that GYMs and SPXs are produced through common biosynthetic genes. Both novel GYMs 1 and 2 were detected in significant amounts in extracts from natural plankton assemblages (1: 447 pg; 2: 1250 pg; 11: 40 pg per mL filtered seawater respectively).
journal_name
Mar Drugsjournal_title
Marine drugsauthors
Zurhelle C,Nieva J,Tillmann U,Harder T,Krock B,Tebben Jdoi
10.3390/md16110446subject
Has Abstractpub_date
2018-11-14 00:00:00issue
11issn
1660-3397pii
md16110446journal_volume
16pub_type
杂志文章相关文献
Marine Drugs文献大全abstract::Fish processing industries generate a large volume of discards. In order to fulfil with the principles of a sustainable circular economy, it is necessary to maintain aquaculture by-products in the food chain through the production of high-value biomolecules that can be used as novel ingredients. In this study, we try ...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md18020101
更新日期:2020-02-04 00:00:00
abstract::In the present study, histone from immature testis of Atlantic salmon was extracted and identified, and its antibacterial activity after enzymolysis was investigated. Histone extracted from Atlantic salmon (Salmo salar) testis using the acid extraction method was successfully identified by LC-MS/MS, and revealed signi...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md18030133
更新日期:2020-02-26 00:00:00
abstract::Two novel biscembranoids, sarelengans A and B (1 and 2), five new cembranoids, sarelengans C-G (3-7), along with two known cembranoids (8 and 9) were isolated from the South China Sea soft coral Sarcophyton elegans. Their structures were determined by spectroscopic and chemical methods, and those of 1, 4, 5, and 6 wer...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md15040085
更新日期:2017-03-23 00:00:00
abstract::A novel, cold-adapted, and acid-base stable manganese superoxide dismutase (Ps-Mn-SOD) was cloned from hadal sea cucumber Paelopatides sp. The dimeric recombinant enzyme exhibited approximately 60 kDa in molecular weight, expressed activity from 0 °C to 70 °C with an optimal temperature of 0 °C, and resisted wide pH v...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17020084
更新日期:2019-02-01 00:00:00
abstract::Diverse indoles and bis-indoles extracted from marine sources have been identified as promising anticancer leads. Herein, we designed and synthesized novel bis-indole series 7a-f and 9a-h as Topsentin and Nortopsentin analogs. Our design is based on replacing the heterocyclic spacer in the natural leads by a more flex...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md18040190
更新日期:2020-04-02 00:00:00
abstract::Collagen is widely used in the pharmaceutical, tissue engineering, nutraceutical, and cosmetic industries. In this study, acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC) were extracted from the skin of red stingray, and its physicochemical and functional properties were investigated. The yields of ASC an...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17100558
更新日期:2019-09-28 00:00:00
abstract::Hepatic fibrosis is an effusive wound healing process, characterized by an excessive deposition of extracellular matrix (ECM), as the consequence of chronic liver injury of any etiology. Current therapeutic repertoire for hepatic fibrosis is limited to withdrawal of the noxious agent, which is not always feasible. Hen...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md13085201
更新日期:2015-08-18 00:00:00
abstract::Natural marine products have shown an interesting array of diverse and novel chemical structures with potent biological activities. Our study reports the antiproliferative assays of crude extracts, fraction and pure compound (4R,9S,14S)-4α-acetoxy-9β,14α-dihydroxydolast-1(15),7-diene (1) obtained from brown alga Canis...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md9112369
更新日期:2011-01-01 00:00:00
abstract::Ovarian cancer is one of the prevalent gynecological cancers occurring in women. In particular, the efficiency of standard therapeutic methods decreases when recurrence and chemoresistance ensue. To assist standard anti-cancer agents in the cure of ovarian cancer, development and application of new compounds such as s...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17060331
更新日期:2019-06-03 00:00:00
abstract::With the depletion of global fish stocks, caused by high demand and effective fishing techniques, alternative sources for long chain omega-3 fatty acids are required for human nutrition and aquaculture feeds. Recent research has focused on land-based cultivation of microalgae, the primary producers of omega-3 fatty ac...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md12063381
更新日期:2014-06-04 00:00:00
abstract::Ten new di-, tri- and tetrasulfated triterpene glycosides, psolusosides B1 (1), B2 (2), J (3), K (4), L (5), M (6), N (7), O (8), P (9), and Q (10), were isolated from the sea cucumber Psolus fabricii collected in the Sea of Okhotsk near the Kurile Islands. Structures of these glycosides were established by two-dimens...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17110631
更新日期:2019-11-06 00:00:00
abstract::The Asian coastal communities have used the brown seaweeds Fucus vesiculosus and Ascophyllum nodosum since ancient times. Recently, some in vitro and in vivo studies have demonstrated their abilities in reducing risk factors for metabolic syndrome. Here, we analyzed the protective effect of a phytocomplex extracted fr...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md18010062
更新日期:2020-01-17 00:00:00
abstract::The present study investigated the effect of dietary astaxanthin (AX) on the growth performance, antioxidant parameters, and repair of hepatopancreas damage in Pacific white shrimp (Litopenaeus vannamei). To evaluate the hepatopancreas protective function of AX in shrimps, we compared the effect of five isonitrogenous...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md18040218
更新日期:2020-04-17 00:00:00
abstract::Shrimp is one of the most popular seafoods worldwide, and its lipids have been studied for biological activity in both, muscle and exoskeleton. Free fatty acids, triglycerides, carotenoids, and other lipids integrate this fraction, and some of these compounds have been reported with cancer chemopreventive activities. ...
journal_title:Marine drugs
pub_type: 杂志文章,评审
doi:10.3390/md11103926
更新日期:2013-10-16 00:00:00
abstract::Aaptos is a genus of marine sponge which belongs to Suberitidae and is distributed in tropical and subtropical oceans. Bioactivity-guided fractionation of Aaptos sp. methanolic extract resulted in the isolation of aaptamine, demethyloxyaaptamine, and isoaaptamine. The cytotoxic activity of the isolated compounds was e...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md16010018
更新日期:2018-01-09 00:00:00
abstract::Ieodomycin B, which shows in vitro antimicrobial activity, was isolated from a marine Bacillus species. A novel asymmetric total synthetic approach to ieodomycin B using commercially available geraniol was achieved. The approach involves the generation of 1,3-trans-dihydroxyl at C-3 and C-5 positions via a Crimmins-mo...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md15010017
更新日期:2017-01-18 00:00:00
abstract::Collagenases are the most important group of commercially-produced enzymes. However, even though biological resources are abundant in the sea, very few of these commercially popular enzymes are from marine sources, especially from marine bacteria. We optimized the production of marine collagenases by Pseudoalteromonas...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md15120377
更新日期:2017-12-04 00:00:00
abstract::Infection with Helicobacter pylori is a critical cause of gastrointestinal diseases. A crucial host response associated with H. pylori infection includes gastric inflammation, which is characterized by a sustained recruitment of T-helper (Th) cells to the site of infection and distinct patterns of cytokine production....
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17070382
更新日期:2019-06-26 00:00:00
abstract::Ciguatoxins (CTXs) are marine toxins that cause ciguatera fish poisoning, a debilitating disease dominated by sensory and neurological disturbances that include cold allodynia and various painful symptoms as well as long-lasting pruritus. Although CTXs are known as the most potent mammalian sodium channel activator to...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md15090269
更新日期:2017-08-30 00:00:00
abstract::There are numerous biologically active substances with novel structures and unique physiological functions in marine organisms. These substances are important sources of new lead compounds. Pelorol is a natural product isolated from marine organisms that possesses a novel structure with high bioactivity. In this paper...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md14060118
更新日期:2016-06-21 00:00:00
abstract::One new α-pyrone (nocapyrone R (1)), and three known γ-pyrones (nocapyrones B, H and L (2-4)) were isolated from the culture extract of a Nocardiopsis strain collected from marine sediment. Structures of these compounds were determined on the basis of spectroscopic data including NMR and MS. γ-Pyrones 2-4 were found t...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md12074110
更新日期:2014-07-08 00:00:00
abstract::The development of oxidative stress in the marine ecosystem is a concurring concern in fish reproductive behavior. Marine fish being rich in polyunsaturated fatty acids (PUFA) are precursors of prostaglandin pheromone mediators but also vulnerable to lipid peroxidation. It is yet to be determined if hypoxia or hyperox...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md13042215
更新日期:2015-04-14 00:00:00
abstract::The vast oceans of the world, which comprise a huge variety of unique ecosystems, are emerging as a rich and relatively untapped source of novel bioactive compounds with invaluable biotechnological and pharmaceutical potential. Evidence accumulated over the last decade has revealed that the diversity of marine microor...
journal_title:Marine drugs
pub_type: 杂志文章,评审
doi:10.3390/md13052924
更新日期:2015-05-13 00:00:00
abstract::Ulvan lyases can degrade ulvan to oligosaccharides with potent biological activity. A new ulvan lyase gene, ALT3695, was identified in Alteromonas sp. A321. Soluble expression of ALT3695 was achieved in Escherichia coli BL21 (DE3). The 1314-bp gene encoded a protein with 437 amino acid residues. The amino acid sequenc...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md17100568
更新日期:2019-10-08 00:00:00
abstract::Microalgae are promising sources for the sustainable production of compounds of interest for biotechnologies. Compared to higher plants, microalgae have a faster growth rate and can be grown in industrial photobioreactors. The microalgae biomass contains specific metabolites of high added value for biotechnology such ...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md16030076
更新日期:2018-02-28 00:00:00
abstract::Intermittent hypobaric hypoxia (IH) is linked with oxidative stress, impairing cardiac function. However, early IH also activate cardio-protective mechanisms. Omega 3 fatty acids (Ω3) induce cardioprotection by reducing infarct size and reinforcing antioxidant defenses. The aim of this work was to determine the combin...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md13020838
更新日期:2015-02-04 00:00:00
abstract::Prostate cancer (PCa), the most common malignancy in men, is a major cause of cancer deaths. A better understanding of the mechanisms that drive tumor initiation and progression may identify actionable targets to improve treatment of this patient group. As a dietary carotenoid, astaxanthin has been demonstrated to exe...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md15030066
更新日期:2017-03-08 00:00:00
abstract::Concerning the requirements of effective drug candidates to combat against high rising multidrug resistant pathogens, we isolated three new linear lipopeptides, gageostatins A-C (1-3), consisting of hepta-peptides and new 3-β-hydroxy fatty acids from the fermentation broth of a marine-derived bacterium Bacillus subtil...
journal_title:Marine drugs
pub_type: 杂志文章
doi:10.3390/md12020871
更新日期:2014-01-31 00:00:00
abstract::Marine organisms exhibit some advantages as a renewable source of potential drugs, far beyond chemotherapics. Particularly, the number of marine natural products with antithrombotic activity has increased in the last few years, and reports show a wide diversity in scaffolds, beyond the polysaccharide framework. While ...
journal_title:Marine drugs
pub_type: 杂志文章,评审
doi:10.3390/md17030170
更新日期:2019-03-16 00:00:00
abstract::Pectenotoxin-2 (PTX-2), which was first identified as a cytotoxic entity in marine sponges, has been reported to display significant cytotoxicity to human cancer cells where it inhibits mitotic separation and cytokinesis through the depolymerization of actin filaments. In the late stage of endoreduplication, the effec...
journal_title:Marine drugs
pub_type: 杂志文章,评审
doi:10.3390/md9112176
更新日期:2011-01-01 00:00:00