Cycloforskamide, a Cytotoxic Macrocyclic Peptide from the Sea Slug <i>Pleurobranchus forskalii</i>
作者:Karen Co Tan、Toshiyuki Wakimoto、Kentaro Takada、Takashi Ohtsuki、Nahoko Uchiyama、Yukihiro Goda、Ikuro Abe
DOI:10.1021/np400404r
日期:2013.7.26
A macrocylic dodecapeptide, cycloforskamide, was isolated from the sea slug Pleurobranchus forskalii, collected off Ishigaki Island, Japan. Its planar structure was deduced by extensive NMR analyses and was further confirmed by MS/MS fragmentation analyses. Finally, the absolute configuration was determined by total hydrolysis and chiral-phase gas chromatographic analysis. This novel dodecapeptide contains three D-amino acids and three thiazoline heterocycles and exhibits cytotoxicity against murine leukemia P388 cells, with an IC50 of 5.8 mu M.
Catenulobactins A and B, Heterocyclic Peptides from Culturing <i>Catenuloplanes</i> sp. with a Mycolic Acid-Containing Bacterium
The production of two new heterocyclic peptide isomers, catenulobactins A (1) and B (2), in cultures of Catenuloplanes sp. RD067331 was significantly increased when it was cocultured with a mycolic acid-containing bacterium. The planar structures and absolute configurations of the catenulobactins were determined based on NMR/MS and chiral-phase GC-MS analyses. Catenulobactin B (2) displayed Fe(III)-chelating activity and moderate cytotoxicity against P388 murine leukemia cells.
N-Trifluoracetyl-aminosäuren, XIX. Gaschromatographische Trennung von<i>N</i>-TFA-Dipeptid-methylestern
作者:Friedrich Weygand、Bruno Kolb、Axel Prox、Monohar A. Tilak、Ichiro Tomida
DOI:10.1515/bchm2.1960.322.1.38
日期:1960.1
Nyuzenamides A and B: Bicyclic Peptides with Antifungal and Cytotoxic Activity from a Marine-Derived <i>Streptomyces</i> sp.
作者:Md. Rokon Ul Karim、Yasuko In、Tao Zhou、Enjuro Harunari、Naoya Oku、Yasuhiro Igarashi