Effect of red blood cell shape changes on haemoglobin interactions and dynamics: a neutron scattering study

Royal Society Open Science
Keyun ShouAndreas Maximilian Stadler

Abstract

By using a combination of experimental neutron scattering techniques, it is possible to obtain a statistical perspective on red blood cell (RBC) shape in suspensions, and the inter-relationship with protein interactions and dynamics inside the confinement of the cell membrane. In this study, we examined the ultrastructure of RBC and protein-protein interactions of haemoglobin (Hb) in them using ultra-small-angle neutron scattering and small-angle neutron scattering (SANS). In addition, we used the neutron backscattering method to access Hb motion on the ns time scale and Å length scale. Quasi-elastic neutron scattering (QENS) experiments were performed to measure diffusive motion of Hb in RBCs and in an RBC lysate. By using QENS, we probed both internal Hb dynamics and global protein diffusion, on the accessible time scale and length scale by QENS. Shape changes of RBCs and variation of intracellular Hb concentration were induced by addition of the Na+-selective ionophore monensin and the K+-selective one, valinomycin. The experimental SANS and QENS results are discussed within the framework of crowded protein solutions, where free motion of Hb is obstructed by mutual interactions.

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Citations

Sep 8, 2021·Soft Matter·Christian BeckTilo Seydel

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Methods Mentioned

BETA
protein folding
neutron scattering
SANS
neutron spectroscopy
nuclear magnetic resonance
X-ray
dynamic light scattering
NMR

Software Mentioned

jscatter
HYDROPRO
CRYSON
QUOKKA
SANS
Gumtree
QENS
KOOKABURRA

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