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The extract of a sample of the sponge Theonella aff. swinhoei collected in Madagascar exhibited promising in vitro antiplasmodial activity. The antiplasmodial activity was ascribed in part to the known metabolite swinholide A. Further investigation of the extract afforded three unusual cyclic peptides, cyclotheonellazoles A-C (1-3), which contain six nonproteinogenic amino acids out of the eight acid units that compose these natural products. Among these acids the most novel were 4-propenoyl-2-tyrosylthiazole and 3-amino-4-methyl-2-oxohexanoic acid. The structure of the compounds was elucidated by interpretation of the 1D and 2D NMR data, HRESIMS, and advanced Merfay's techniques. The new compounds were found to be nanomolar inhibitors of chymotrypsin and sub-nanomolar inhibitors of elastase, but did not present antiplasmodial activity.
This article was published in the following journal.
Name: Journal of natural products
As a part of our continuing work to find out bioactive lead molecules from marine invertebrates, the CHCl₃ fraction of the organic extract of the Red Sea sponge Theonella mirabilis showed cytotoxic ...
Yakushinamides A (1) and B (2), prolyl amides of polyoxygenated fatty acids, have been isolated from the marine sponge Theonella swinhoei as inhibitors of HDACs and SIRTs. Their planar structures were...
The endophytic fungus Fusarium equiseti was isolated from the brown alga Padina pavonica, collected from the Red Sea. The fungus was identified by its morphology and 18S rDNA. Cultivation of this fung...
During the search for protein tyrosine phosphatase 1B (PTP1B) inhibitors from marine organisms, the known tetramic acid derivative, melophlin C (1), was isolated as an active component together with t...
Theonellapeptolide Id is a tridecapeptide containing a 37-membered lactone, originally isolated from the marine sponge Theonella swinhoei. In addition to moderate cytotoxicity, immunosuppressive activ...
The purpose of this study is to determine the mechanisms by which HIV protease inhibitors contribute to the development of diabetes in HIV-infected patients. The investigators propose tha...
The purpose of this study is to find out whether taking protease inhibitors (anti-HIV drugs) together with lipid-lowering drugs (drugs which lower the amount of fat in the blood) has an ef...
The aim of this study is to characterize neutrophil function in patients undergoing chronic hepatitis C triple therapy with protease inhibitors in comparison to dual therapy with peginterf...
Some HIV-infected adults develop lipodystrophy that includes significant changes in body shape, with fat losses in the face, arms and legs, and fat gain in the trunk. This lipodystrophy i...
The purpose of the study is to study the effects of switching from an antiretroviral combination that includes two ritonavir boosted protease inhibitors to replacement of these two proteas...
Inhibitors of HIV PROTEASE, an enzyme required for production of proteins needed for viral assembly.
Extracellular protease inhibitors that are secreted from FIBROBLASTS. They form a covalent complex with SERINE PROTEASES and can mediate their cellular internalization and degradation.
Circulating 38-kDa proteins that are internal peptide fragments of PLASMINOGEN. The name derives from the fact that they are potent ANGIOGENESIS INHIBITORS. Angiostatins contain four KRINGLE DOMAINS which are associated with their potent angiostatic activity.
Sterile, gelatin-base surgical sponge applied topically as an adjunct to hemostasis when the control of bleeding by conventional procedures is ineffective to reduce capillary ooze or is impractical. (From AMA Drug Evaluations Annual, 1994, p797)
Compounds which inhibit or antagonize biosynthesis or actions of proteases (ENDOPEPTIDASES).
Standard antiretroviral therapy (ART) consists of the combination of at least three antiretroviral (ARV) drugs to maximally suppress the HIV virus and stop the progression of HIV disease. Huge reductions have been seen in rates of death and suffering whe...