Sameuramide A, a new cyclic depsipeptide isolated from an ascidian of the family Didemnidae

Koshi Machida, Daisuke Arai, Ryosuke Katsumata, Satoshi Otsuka, Jun K. Yamashita, Tao Ye, Shoubin Tang, Nobuhiro Fusetani, Yoichi Nakao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Sameuramide A (1), a new cyclic depsipeptide encompassing one each of alanine, N-methyl alanine, N-methyl dehydroalanine, N,O-dimethyl threonine, phenyllactic acid, three β-hydroxy leucines, and two propionates, was isolated from a didemnid ascidian collected at the northern part of Japan. The planar structure was established based on the interpretation of MS and NMR data. The absolute configuration of the subunits was determined by the advanced Marfey's method and the chiral LC-MS analysis. Compound 1 exhibited the activity of maintaining colony formation of murine embryonic stem (mES) cells without leukemia inhibitory factor (LIF). Down regulation of the gene expression of Krüppel-like transcription factor 4 (Klf4) indicated that 1 itself was not able to maintain the undifferentiated state of the mES cells. However, the expression levels of the marker genes (Nestin, T, Sox17) for three germ layers were upregulated in embryoid bodies (EBs) after treatment of 1 together with LIF, suggesting that 1 plays a supportive role for LIF in maintaining the multipotency of mES cells.

Original languageEnglish
Pages (from-to)3852-3857
Number of pages6
JournalBioorganic and Medicinal Chemistry
Issue number13
Publication statusPublished - 2018 Jul 30


  • Colony formation
  • Didemnid ascidian
  • Embryonic stem cells
  • Marine natural products
  • Peptide

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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