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Measurement of Heme Synthesis Levels in Mammalian Cells
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Modulation of hemoglobin dynamics by an allosteric effector.

Jyotsana Lal1, Marco Maccarini2, Peter Fouquet2

  • 1Biosciences Division, Argonne National Laboratory, Argonne, Illinois, 60439.

Protein Science : a Publication of the Protein Society
|December 16, 2016
PubMed
Summary
This summary is machine-generated.

Inositol hexaphosphate (IHP) binding to hemoglobin (Hb) increases subunit motions, impacting oxygen affinity. This study reveals enhanced protein dynamics, not structural changes, underlie Hb

Keywords:
X-ray solution scatteringhemoglobinneutron spin echoprotein dynamics

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Area of Science:

  • Biophysics
  • Structural Biology
  • Protein Dynamics

Background:

  • Hemoglobin (Hb) function is modulated by allosteric effectors, but the role of protein dynamics in these interactions remains poorly understood.
  • Characterizing slow, correlated motions of Hb subunits is experimentally and computationally challenging.

Purpose of the Study:

  • To investigate how inositol hexaphosphate (IHP) binding affects the structure and dynamics of carboxyhemoglobin (HbCO).
  • To elucidate the molecular mechanisms by which IHP influences oxygen affinity.

Main Methods:

  • Neutron spin echo (NSE) measurements.
  • Wide-angle X-ray scattering (WAXS).
  • Combined application of NSE and WAXS to probe protein dynamics and structure.

Main Results:

  • IHP binding to HbCO significantly increases the rate of coordinated motions between Hb subunits.
  • Large-scale structural changes were minimal upon IHP binding.
  • Enhanced large-scale dynamics correlated with a decrease in higher-frequency motions of individual residues.

Conclusions:

  • Increased dynamic motions, rather than significant structural alterations, are key to IHP's functional effects on Hb.
  • Enhanced protein dynamics likely mediate the lowered oxygen affinity observed in the presence of IHP.
  • This study highlights the critical role of protein dynamics in allosteric regulation.