Abstract
We describe a two-dimensional thermal proteome profiling strategy that can be combined with an orthogonal chemoproteomics approach to enable comprehensive target profiling of the marketed histone deacetylase inhibitor panobinostat. The N-hydroxycinnamide moiety is identified as critical for potent and tetrahydrobiopterin-competitive inhibition of phenylalanine hydroxylase leading to increases in phenylalanine and decreases in tyrosine levels. These findings provide a rationale for adverse clinical observations and suggest repurposing of the drug for treatment of tyrosinemia.
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Acknowledgements
We thank J. Stuhlfauth for cell culture; M. Jundt, K. Kammerer, M. Klös-Hudak, M. Paulmann and T. Rudi for expert technical assistance; and G. Drewes for helpful suggestions. We also thank W.F. Mueller for providing cells for metabolomics experiments. P.F.F. acknowledges support from the Welch Foundation (grant AQ-1245). C.R.B. was supported by a VENI grant (project 722.013.009) from the Netherlands Organization for Scientific Research.
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Contributions
I.B., M.B. and M.M.S. conceived the project; I.B., T.W., M.B. and M.M.S. designed the biochemical, cell biological and MS experiments; I.B. and T.W. performed MS experiments; E.A.Z. and C.R.B. designed and performed metabolomics experiments; A.R. and M.M. synthesized the panobinostat-amide and gave advice; P.F.F. and C.A.K. designed and performed enzyme activity experiments; I.B., I.T. and E.S. performed biochemical and cell biological experiments; I.B., T.W., C.D., M.B. and M.M.S. contributed to data analysis; E.A.Z., C.R.B. and P.F.F. contributed to the manuscript; I.B., M.B. and M.M.S. wrote the manuscript.
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Competing interests
I.B., T.W., C.D., I.T., A.R., M.M., E.S., M.B. and M.M.S. are employees and/or shareholders of Cellzome GmbH and GlaxoSmithKline, which funded this work.
Supplementary information
Supplementary Text and Figures
Supplementary Results, Supplementary Tables 1–6 and Supplementary Figures 1–17. (PDF 4463 kb)
Supplementary Note
Synthetic procedures (PDF 156 kb)
Supplementary Data Set 1
2D-TPP in HepG2 cells. (XLSX 23511 kb)
Supplementary Data Set 2
2D-TPP in HepG2 cell extract. (XLSX 16105 kb)
Supplementary Data Set 3
HepG2 TPP TR (reference for melting temperature). (XLSX 3614 kb)
Supplementary Data Set 4
TTC38 immunoprecipitation. (XLSX 347 kb)
Supplementary Data Set 5
TPP CCR vorinostat in HepG2 cells. (XLSX 5219 kb)
Supplementary Data Set 6
HepG2 TPP TR with vehicle and panobinostat. (XLSX 11588 kb)
Supplementary Data Set 7
Affinity-based pulldowns using panobinostat beads, with and without detergent. (XLSX 3584 kb)
Supplementary Data Set 8
Affinity-based pulldowns using panobinostat beads, competition with panobinostat in SH-SY5Y cell extract. (XLSX 1919 kb)
Supplementary Data Set 9
Metabolomics data for amino acids intracellular and in cell medium after HepG2 treatment with panobinostat. (XLSX 43 kb)
Supplementary Data Set 10
Metabolomics data for intracellular and in cell medium amino acid levels after treatment with panobinostat (SH-SY5Y cells). (XLSX 40 kb)
Supplementary Data Set 11
Affinity-based pulldowns using panobinostat beads, competition with tetrahydrobiopterin. (XLSX 1921 kb)
Supplementary Data Set 12
Affinity-based pulldowns using panobinostat beads, competition with panobinostat-amide. (XLSX 1331 kb)
Supplementary Data Set 13
Affinity-based pulldowns using panobinostat beads, competition with belinostat. (XLSX 1932 kb)
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Becher, I., Werner, T., Doce, C. et al. Thermal profiling reveals phenylalanine hydroxylase as an off-target of panobinostat. Nat Chem Biol 12, 908–910 (2016). https://doi.org/10.1038/nchembio.2185
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DOI: https://doi.org/10.1038/nchembio.2185
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