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Optimizing proximity proteomics on the EvoSep-timsTOF LC-MS system
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  • Julia Kitaygorodsky,
  • Brendon Seale,
  • Reuben Samson,
  • Martina Tersigni,
  • Zhen-Yuan Lin,
  • Cassandra Wong,
  • Vesal Kasmaeifar,
  • Anne-Claude Gingras
Julia Kitaygorodsky
University of Toronto
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Brendon Seale
Lunenfeld-Tanenbaum Research Institute
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Reuben Samson
University of Toronto
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Martina Tersigni
Lunenfeld-Tanenbaum Research Institute
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Zhen-Yuan Lin
Lunenfeld-Tanenbaum Research Institute
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Cassandra Wong
Lunenfeld-Tanenbaum Research Institute
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Vesal Kasmaeifar
University of Toronto
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Anne-Claude Gingras
Lunenfeld-Tanenbaum Research Institute

Corresponding Author:gingras@lunenfeld.ca

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Abstract

Proximity-dependent biotinylation (PDB) is a powerful means of exploring the cellular environments in which proteins reside. Expressing a protein of interest (bait) fused to a biotin ligase and adding biotin induces the covalent biotinylation of proximal partners, which are recovered on streptavidin beads and identified by MS. However, a major technical limitation of PDB is peptide carryover into subsequent MS runs. This is mitigated via lengthy inter-sample washing, considerably lowering throughput. This study aims to optimize PDB sample acquisition using an EvoSep LC system coupled to a timsTOF mass spectrometer, which has higher throughput and sensitivity than our current system, with less carryover. Our efforts resulted in an ~15-fold increase in throughput using the 60 samples-per-day (SPD) gradient with better sensitivity, identifying nearly double the proteins found by our previously standardized workflow. Significance scoring also revealed more sensitive detection of high-confidence proximal interactions (~1.5-fold) for five well-characterized baits, validating the new experimental workflow. Importantly, carryover was extremely limited, even without inter-sample washing, and limited to easily filterable abundant proteins. Without washing, this method can process 60 samples per day, using 1/16th of the sample amount previously required.
30 Sep 2024Submitted to PROTEOMICS
08 Oct 2024Submission Checks Completed
08 Oct 2024Assigned to Editor
08 Oct 2024Review(s) Completed, Editorial Evaluation Pending
08 Oct 2024Reviewer(s) Assigned
25 Nov 2024Editorial Decision: Revise Minor