Gombamide A, a Cyclic Thiopeptide from the Sponge Clathria gombawuiensis
摘要:
A new peptide, gombamide A (1), was isolated from the marine sponge Clathria gombawuiensis, collected from Korean waters. On the basis of the results of combined spectroscopic analyses, the structure of this compound was determined to be a cyclic C-terminally modified thiohexapeptide containing the unusual amino acid residues para-hydroxystyrylamide (pHSA) and pyroglutamic acid (pyroGlu). The absolute configurations of all amino acid residues were determined to be L by advanced Marfey's analysis. The new compound exhibited weak cytotoxicity against A549 and K562 cell lines as well as moderate inhibitory activity against Na+/K+-ATPase.
The first total synthesis of Gombamide A (1), a cytotoxic cyclic thiopeptide from the sponge Clathria gombawuiensis, has been achieved. Highlights of the convergent synthesis feature a disulfide bond forming cascade to close the 17-membered macrocycle and a selenoazidylation procedure to access the unusual para-hydroxystyrlyamide (pHSA) moiety. The synthesis required 18 steps, 11 steps in its longest
Gombamide A, a Cyclic Thiopeptide from the Sponge <i>Clathria gombawuiensis</i>
作者:Jung-Kyun Woo、Ju-eun Jeon、Chang-Kwon Kim、Chung J. Sim、Dong-Chan Oh、Ki-Bong Oh、Jongheon Shin
DOI:10.1021/np4003367
日期:2013.7.26
A new peptide, gombamide A (1), was isolated from the marine sponge Clathria gombawuiensis, collected from Korean waters. On the basis of the results of combined spectroscopic analyses, the structure of this compound was determined to be a cyclic C-terminally modified thiohexapeptide containing the unusual amino acid residues para-hydroxystyrylamide (pHSA) and pyroglutamic acid (pyroGlu). The absolute configurations of all amino acid residues were determined to be L by advanced Marfey's analysis. The new compound exhibited weak cytotoxicity against A549 and K562 cell lines as well as moderate inhibitory activity against Na+/K+-ATPase.