Allosteric Glutaminase Inhibitors Based on a 1,4-Di(5-amino-1,3,4-thiadiazol-2-yl)butane Scaffold

Sarah C. Zimmermann, Emily F. Wolf, Andrew Luu, Ajit G. Thomas, Marigo Stathis, Brad Poore, Christopher Nguyen, Anne Le, Camilo Rojas, Barbara S. Slusher, Takashi Tsukamoto

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


A series of allosteric kidney-type glutaminase (GLS) inhibitors were designed and synthesized using 1,4-di(5-amino-1,3,4-thiadiazol-2-yl)butane as a core scaffold. A variety of modified phenylacetyl groups were incorporated into the 5-amino group of the two thiadiazole rings in an attempt to facilitate additional binding interactions with the allosteric binding site of GLS. Among the newly synthesized compounds, 4-hydroxy-N-[5-[4-[5-[(2-phenylacetyl)amino]-1,3,4-thiadiazol-2-yl]butyl]-1,3,4-thiadiazol-2-yl]-benzeneacetamide, 2m, potently inhibited GLS with an IC50 value of 70 nM, although it did not exhibit time-dependency as seen with CB-839. Antiproliferative effects of 2m on human breast cancer lines will be also presented in comparison with those observed with CB-839.

Original languageEnglish (US)
Pages (from-to)520-524
Number of pages5
JournalACS Medicinal Chemistry Letters
Issue number5
StatePublished - May 12 2016


  • Glutaminase
  • allosteric inhibition
  • cancer metabolism

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry


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