Poster Presentation HUPO 2019 - 18th Human Proteome Organization World Congress

MS-CETSA for proteome-wide study of the modulation of protein interaction states (#487)

Lingyun Dai 1 , Tianyun Zhao 1 , Xavier Bisteau 2 , Wendi Sun 1 , Nayana Prabhu 1 , Yan Ting Lim 1 , Radoslaw Sobota 2 , Philipp Kaldis 2 , Pär Nordlund 1 2 3
  1. School of Biological Sciences, Nanyang Technological University, Singapore
  2. Institute of Molecular and Cell Biology, A*STAR, Singapore
  3. Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden

The Cellular Thermal Shift Assay (CETSA) is based on our discovery that the biophysical principle of ligand binding-induced thermal stabilization of proteins holds true for the proteins inside cells. CETSA coupled with mass spectrometry (MS-CETSA) has become a powerful discovery method for identifying drug targets and understanding drug actions on a proteome-wide scale. However, until recently, the use of CETSA for proteome-wide studies of cellular states with differential physiological interactions has not been fully explored. In a study of specific cell cycle phases in K562 cells, with a novel compact multidimensional MS-CETSA strategy, we uncovered modulations of interaction states for more than 750 proteins along the cell cycle, reflecting the biochemical processes such as protein phosphorylation, DNA binding and protein complex formation. Notably, many protein complexes are modulated in specific cell cycle phases, reflecting their roles in biological processes such as DNA replication, chromatin remodeling, transcription, translation, and nuclear membrane decomposition. Therefore, CETSA provides the first method for direct studies of the integrated modulation of protein interaction states (IMPRINTS) with physiological ligands in living cells. We believe this approach, which we refer to as IMPRINTS-CETSA, will open novel exciting opportunities to understand the operational aspects of cellular proteomes in intact cells and tissues.

  1. Dai L, Zhao T, Bisteau X, Sun W, Prabhu N, Lim YT, Sobota RM, Kaldis P, Nordlund P. Modulation of Protein-Interaction States through the Cell Cycle. Cell. 2018 May 31;173(6):1481-1494.e13.
  2. Dai L, Prabhu N, Liang YY, Bacanu S, Ramos A, Nordlund P. Horizontal Cell Biology: Monitoring Global Changes of Protein Interaction States in Cells with Proteome-Wide CETSA. Annual Review of Biochemistry. 2019. June 20; 88.