Evidence for temperature dependent anisotropic diffusive motion of heme iron in crystals of myoglobin through Mossbauer spectroscopy

E. R. Bauminger*, S. G. Cohen, I. Nowik, S. Ofer, J. Yariv

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A careful investigation of Mössbauer absorption of57Fe in an assembly of unaligned crystals of deoxymyoglobin has revealed asynimetric shapes of the spectra in the range of temperatures between -25C and 25C, which includes the physiological significant temperatures. The asymmetry increases with temperature. The spectral shapes, displaying wide wings, show the presence of modes of collective diffusive motion in which the Fe atoms participate. The results are interpreted in terms of temperature-dependent anisotropic dynamics of the slow collective diffusive modes, based on a model of bounded diffusion assuming absorption in an anisotropic harmonic oscillator in Brownian motion. For example, assuming eqQ > 0, and axial symmetry, we obtain at 20C,[Figure not available: see fulltext.]=0.040Å2 and <x12> = 0.016Å2.

Original languageEnglish
Pages (from-to)881-884
Number of pages4
JournalHyperfine Interactions
Volume16
Issue number1-4
DOIs
StatePublished - Dec 1983

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