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Area of Science:

  • Biochemistry
  • Environmental Toxicology
  • Biophysics

Background:

  • Perfluorooctanoic acid (PFOA) is a persistent environmental contaminant.
  • Human hemoglobin (Hb) is crucial for oxygen transport.
  • Understanding PFOA's interaction with Hb is vital for assessing its health impacts.

Purpose of the Study:

  • To investigate the effects of PFOA on human hemoglobin (Hb) at various concentrations.
  • To elucidate the biophysical mechanisms underlying PFOA-Hb interactions.

Main Methods:

  • Time-correlated single photon counting (TCSPC) fluorescence spectroscopy.
  • Native mass spectrometry (NMS).
  • Ion mobility spectrometry (IMS).

Main Results:

  • PFOA alters tryptophan fluorescence quenching in Hb from FRET to charge transfer.
  • NMS identified multiple binding sites for PFOA on Hb.
  • Low PFOA concentrations (10 nM) induced Hb destabilization, α-subunit loss, and heme release.

Conclusions:

  • PFOA binding significantly alters human Hb's biophysical characteristics.
  • These alterations suggest a mechanism of allosteric inhibition.
  • PFOA's interaction with Hb may impair oxygen transport functions.