Mass spectrometric detection of protein nanoclusters: the invisible intermediates of phase separation

Charge detection mass spectrometry detects polydisperse protein nanoclusters of 1–280 molecules (64 kDa–18.4 MDa) as intermediates in biomolecular phase separation.

• Why it matters: Early condensate formation depends on transient intermediates that are difficult to observe with most analytical methods.
• What they did: The study applies charge detection mass spectrometry to measure the mass dispersion of protein nanoclusters representing phase-separation intermediates.
• The result: It reveals cluster sizes spanning 1–280 molecules (64 kDa–18.4 MDa), enabling characterization of intermediates previously invisible to most techniques.

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