Activity of Haliscosamine against Fusarium oxysporum f.sp. melonis: in vitro and in vivo analysis.

Marine sponges are a potential source of new molecules with diverse biological activities. We have previously isolated a sphingosine derivative, (9Z)-2-amino-docos-9-ene-1,3,13,14-tetraol (Haliscosamine) from the Moroccan sea sponge Haliclona viscosa. The aim of this study was to test Haliscosamine in vitro and in vivo for its antifungal activity against Fusarium oxysporum f.

Marine natural products and related compounds as anticancer agents: an overview of their clinical status.

Marine ecosystems constitute a huge reservoir of biologically active secondary metabolites. Consequently during the last past few decades, several marine-derived molecules have been approved for anticancer treatment or are under clinical trials. This review reports the present state of the art of the sixteen molecules approved or currently on the clinical pipeline for anticancer chemotherapy.

Search for hydrophilic marine fungal metabolites: a rational approach for their production and extraction in a bioactivity screening context.

In the search for bioactive natural products, our lab screens hydrophobic extracts from marine fungal strains. While hydrophilic active substances were recently identified from marine macro-organisms, there was a lack of reported metabolites in the marine fungi area. As such, we decided to develop a general procedure for screening of hydrophobic metabolites.

Phospholipid distribution and phospholipid fatty acids of the tropical tunicates Eudistoma sp. and Leptoclinides uniorbis.

Two tunicates, Eudistoma sp. and Leptoclinides uniorbis, collected from the tropical waters off Djibouti were investigated for lipids and phospholipid (PL) fatty acids. PL accounted for 38.

Enhancement of domoic acid neurotoxicity on Diptera larvae bioassay by marine fungal metabolites.

Peptaibols are small linear fungal peptides which are produced in the marine environment. They exhibit neurotoxicity by forming pores in neuronal membranes. This work describes their combine effect with domoic acid, a neurotoxic phycotoxin, on Diptera larvae.

Structural investigation and elucidation of new communesins from a marine-derived Penicillium expansum Link by liquid chromatography/electrospray ionization mass spectrometry.

Penicillium expansum is a ubiquitous species for which there are only few reports for chemical investigation in marine environments. Among the numerous secondary metabolites produced by this species, communesins represent a new class of cytotoxic and insecticidal indole alkaloids. In this study, we investigated a marine P.

Peptaibols: stable markers of fungal development in the marine environment.

Different peptaibols were observed in both fresh and frozen marine sediments collected from a marine area devoted to bivalve culture (Fier d'Ars, Atlantic coast, France). The identification of the peptaibols was based on a three-step mass-spectrometric analysis: observation of doubly charged ions with a characteristic isotopic profile, cleavage and observation of C- and N-terminal fragments, and partial sequencing of the N-terminal segments. The MS characteristics indicated numerous similarities between the peptaibols detected and those produced by different strains of Trichoderma species isolated from fresh sediments.

Synthesis of derivatives of potent antitumor bistramides D and A leading to the first crystal structure of natural bistramide D.

We report a crystalline derivative of bistramide D synthesized from natural bistramide A, and its structure was determined by X-ray analysis.

Sensitivity of cardiac background inward rectifying K+ outward current (IK1) to the alkaloids lepadiformines A, B, and C.

Three marine alkaloids, purified from Clavelina moluccensis, were structurally identified as lepadiformines A, B, and C and studied on frog atrial myocytes I(K1), using the patch-clamp technique. Lepadiformine A (0.4 to 3.

New short peptaibols from a marine Trichoderma strain.

The production of peptaibols by a marine-related Trichoderma longibrachiatum strain was studied using electrospray ionisation multiple-stage ion trap mass spectrometry (ESI-MSn-IT) and gas chromatography/electron impact mass spectrometry (GC/EI-MS). Two major groups of peptaibols were identified, those with long sequences (20 amino acids) and others with short sequences (11 amino acids). This paper describes the methodology used to establish the sequences of short peptaibols in a mixture without previous individual separation.

Combined use of LC/MS and a biological test for rapid identification of marine mycotoxins produced by Trichoderma koningii.

Trichoderma koningii Oudemans, a strain isolated from a shellfish farming area, was selected for its high frequency in samples and its ability to produce metabolites when cultured in natural seawater. Combined use of LC/MS and a biological test on blowfly larvae allowed the characterization of four compounds after purification in only two steps (VLC and HPLC). ESI/MS, a powerful tool for rapid identification and sequence determination of peptides, confirmed that these compounds were peptide, alpha-aminoisobutyric acid and amino alcohol (peptaibols), the usual metabolites of Trichoderma.