Biselyngbyasides, cytotoxic marine macrolides, are novel and potent inhibitors of the Ca2+ pumps with a unique mode of binding

Maho Morita, Haruo Ogawa, Osamu Ohno, Takao Yamori, Kiyotake Suenaga, Chikashi Toyoshima

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Biselyngbyasides (BLSs), macrolides from a marine cyanobacterium, are cytotoxic natural products whose target molecule is unknown. Here we report that BLSs are high affinity (Ki ∼ 10 nM) inhibitors of Ca2+-pumps with a unique binding mode. The crystal structures of the Ca2+-pump in complex with BLSs at 3.2-3.5 Å-resolution show that BLSs bind to the pump near the cytoplasmic surface of the transmembrane region. The crystal structures and activity measurement of BLS analogs allow us to identify the structural features that confer high potency to BLSs as inhibitors of the pump.

Original languageEnglish
Pages (from-to)1406-1411
Number of pages6
JournalFEBS Letters
Issue number13
Publication statusPublished - 2015 May 26


  • Ca2+-ATPase
  • Crystal structure
  • High affinity
  • Inhibitor
  • Ion pump
  • Macrolide

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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