Multiplex measurement of protein-peptide dissociation constants using dialysis and mass spectrometry.

Multiplex measurement of protein-peptide dissociation constants using dialysis and mass spectrometry.
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DOI:
10.1002/pro.4607
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发表时间:
2023-04
期刊:
Protein science : a publication of the Protein Society
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We propose a high‐throughput method for quantitatively measuring hundreds of protein–peptide binding affinities in parallel. In this assay, a solution of protein is dialyzed into a buffer containing a pool of potential binding peptides, such that upon equilibration the relative abundance of a peptide species is mathematically related to that peptide's dissociation constant, K d . We use isobaric multiplexed quantitative proteomics to simultaneously determine the relative abundance, and hence the K d and its associated error, for an entire peptide library. We apply this technique, which we call PEDAL (parallel equilibrium dialysis for affinity learning), to determine accurate K d 's between a PDZ domain and hundreds of peptides, spanning an affinity range of multiple orders of magnitude in a single experiment. PEDAL is a convenient, fast, and low‐cost method for measuring large numbers of protein–peptide affinities in parallel, providing a rare combination of true in‐solution binding equilibria with the ability to multiplex.
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