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Dissecting Heterogeneous Populations of Protein-Complex Samples Using Direct Mass Technology.

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This summary is machine-generated.

Charge detection mass spectrometry (CDMS) now enables quantitative analysis of heterogeneous protein samples. This technique accurately measures mass and abundance, advancing biological research.

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Area of Science:

  • Mass Spectrometry
  • Biophysical Chemistry
  • Proteomics

Background:

  • Charge detection mass spectrometry (CDMS) is an emerging technique for qualitative analysis of heterogeneous biological samples.
  • Orbitrap-based CDMS has increased the technique's use in native mass spectrometry (nMS).
  • Current applications of CDMS are primarily qualitative, with limited quantitative studies in the MDa range.

Purpose of the Study:

  • To demonstrate the quantitative capabilities of Orbitrap-based CDMS/Direct Mass Technology (DMT) for heterogeneous protein samples under 100 kDa.
  • To analyze the stability and ligand-binding properties of transthyretin (TTR) variants using DMT.
  • To establish CDMS as a viable quantitative method for complex biological systems.

Main Methods:

  • Utilized Orbitrap-based CDMS/Direct Mass Technology (DMT) for high-resolution mass analysis.
  • Resolved and quantified wild-type (WT) and C-terminally tagged (CT) TTR homotetramers and hybrid tetramers.
  • Analyzed kinetic formation of hybrid TTR and quantified thyroxine binding to TTR variants.

Main Results:

  • DMT successfully resolved WT and CT TTR homotetramers and hybrid tetramers, enabling kinetic analysis.
  • CT-TTR homotetramers showed decreased stability compared to WT-TTR, suggesting C-terminal modification impacts tetramer stability.
  • DMT quantified thyroxine binding, revealing CT-TTR has a higher affinity than WT-TTR, indicating C-terminal involvement in ligand binding.
  • CDMS separated overlapping m/z signals, enabling accurate mass and abundance determination for heterogeneous samples.

Conclusions:

  • Orbitrap-based CDMS/DMT is established as a quantitative approach for heterogeneous protein samples.
  • The C-terminal modification of TTR influences tetramer stability and thyroxine binding affinity.
  • CDMS shows significant potential for broader applications in analyzing complex biological systems.