Eeyarestatin 24 impairs SecYEG-dependent protein trafficking and inhibits growth of clinically relevant pathogens

Maurice Steenhuis, Gregory M. Koningstein, Julia Oswald, Tillman Pick, Sarah O’Keefe, Hans Georg Koch, Adolfo Cavalié, Roger C. Whitehead, Eileithyia Swanton, Stephen High, Joen Luirink*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


Eeyarestatin 1 (ES1) is an inhibitor of endoplasmic reticulum (ER) associated protein degradation, Sec61-dependent Ca2+ homeostasis and protein translocation into the ER. Recently, evidence was presented showing that a smaller analog of ES1, ES24, targets the Sec61-translocon, and captures it in an open conformation that is translocation-incompetent. We now show that ES24 impairs protein secretion and membrane protein insertion in Escherichia coli via the homologous SecYEG-translocon. Transcriptomic analysis suggested that ES24 has a complex mode of action, probably involving multiple targets. Interestingly, ES24 shows antibacterial activity toward clinically relevant strains. Furthermore, the antibacterial activity of ES24 is equivalent to or better than that of nitrofurantoin, a known antibiotic that, although structurally similar to ES24, does not interfere with SecYEG-dependent protein trafficking. Like nitrofurantoin, we find that ES24 requires activation by the NfsA and NfsB nitroreductases, suggesting that the formation of highly reactive nitroso intermediates is essential for target inactivation in vivo.

Original languageEnglish
Article number32798330
Pages (from-to)28-40
Number of pages13
JournalMolecular Microbiology
Issue number1
Early online date15 Aug 2020
Publication statusPublished - Jan 2021


  • eeyarestatin 1
  • Escherichia coli
  • nitrofurantoin
  • Sec61


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