Discovery of SIRT3 inhibitors using SAMDI mass spectrometry

Kaushal Patel, John Sherrill, Milan Mrksich, Michael D. Scholle*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Lysine acetylation plays a critical role in cellular regulation and is implicated in human disease. Sirtuin deacetylases remove acetyl groups from modified lysine residues, and sirtuin 3 (SIRT3) has been identified as a target for cancer therapeutics. Robust and high-throughput screening methods for these targets will be important to the development of therapeutics. This article describes the use of self-assembled monolayer desorption/ionization mass spectrometry, or SAMDI-MS - a label-free drug discovery tool - to characterize SIRT3 activity and discover inhibitors. SAMDI-MS was used to analyze a peptide array having 361 distinct acetylated peptides to identify an active SIRT3 substrate (GYKAcRGC). This peptide was used in a screen of 100,000 small molecules to identify inhibitors of SIRT3. A total of 306 SIRT3 inhibitors were identified, with one compound, SDX-437, having an IC50 of 700 nM with >100-fold selectivity for SIRT3 over SIRT1.

Original languageEnglish (US)
Pages (from-to)842-848
Number of pages7
JournalJournal of Biomolecular Screening
Issue number7
StatePublished - Aug 25 2015


  • deacetylase
  • label-free
  • peptide array
  • self-assembled monolayers

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biotechnology
  • Biochemistry
  • Molecular Medicine
  • Pharmacology
  • Drug Discovery

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