Hemoglobin-carbon monoxide binding rate. Low temperature magneto-optical detection of spin-tunneling Article

Redi, MH, Gerstman, BS, Hopfield, JJ. (1981). Hemoglobin-carbon monoxide binding rate. Low temperature magneto-optical detection of spin-tunneling . BIOPHYSICAL JOURNAL, 35(2), 471-484. 10.1016/S0006-3495(81)84803-5

cited authors

  • Redi, MH; Gerstman, BS; Hopfield, JJ

authors

abstract

  • The spin-tunneling model of Hb--CO binding is used to calculate the binding rate at low temperature and high magnetic fields. The rate is calculated in second order perturbation theory assuming that spin-orbit coupling mediates the Hb iron electronic state change. The reaction which occurs at the crossing of the S = 2 and S = 0 energy vs. configuration coordinate curves is nonadiabatic, having a small electronic transition matrix element. Since detection of CO binding by polarized light in the Soret band makes it possible to observe hemes at specific orientation to the field direction, the rate is calculated for arbitrary heme orientation. Comparison with measurements at low temperature in zero field is made for spin quantization along the molecular crystal field direction. © 1981, The Biophysical Society. All rights reserved.

publication date

  • January 1, 1981

published in

Digital Object Identifier (DOI)

start page

  • 471

end page

  • 484

volume

  • 35

issue

  • 2