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Journal of Chemical Sciences

, 131:15 | Cite as

Quantum chemical studies of structures and spin Hamiltonian parameters of iron transferrin using isolated and embedded clusters models

  • Lokpati Mishra
  • Mahesh SundararajanEmail author
Regular Article
  • 25 Downloads

Abstract

Abstract

Density functional theory (DFT) based calculations using large cluster models are used to elucidate the ground state electronic structure of iron bound transferrin. Explicit incorporation of second coordination amino acid residues and crystallographic water molecules anchors the active site. Our calculations clearly suggest that tyrosine amino acid (Tyr188) residue is bound to iron when the structures are optimized within the continuum solvation model. However, in the gas phase optimized structure, we note that Tyr188 is unbound to Fe (by more than 3 Å). The Mössbauer isomer shift \((\delta )\) and quadrupolar splitting \((\Delta \hbox {E}_{\mathrm{q}})\) of iron transferrin are in line with the experimental data only when Tyr188 is bound to Fe(III). Further, the computed oxygen hyperfine coupling constant value is very large (\(-14.5\) MHz) when bound to iron which can be verified through \(^{17}\hbox {O}\) NMR experiments. We propose that Tyr188 is strongly bound to Fe(III) at physiological pH, which needs to be protonated (acidic pH) to weaken this bond, thus the metal release pathway can be possible only in acidic conditions.

Graphical Abstract

Theoretical spectroscopic based calculations reveal that Tyr188 is bound to iron in transferrin at physiological pH.

Keywords

Transferrin electronic structure DFT amino acid modelling 

Notes

Acknowledgements

Lokpati Mishra acknowledges the continuous encouragement and guidance by Dr. I. S. Singh & Dr. P. D. Sawant, IDS, RSSD and Dr. K.S. Pradeepkumar, Head, RSSD, & Associate Director, HS&EG, BARC. MS thank aggra systems for computational facilities.

Supplementary material

12039_2019_1591_MOESM1_ESM.pdf (628 kb)
Supplementary material 1 (pdf 628 KB)

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Radiation Safety and Systems DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.Homi Bhabha National InstituteMumbaiIndia
  3. 3.Theoretical Chemistry SectionBhabha Atomic Research CentreMumbaiIndia

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