The effect of temperature on the radial distribution function for iron in native horse spleen ferritin
Bauchspieß, K.R., St Pierre, T.G. and Webb, J. (1995) The effect of temperature on the radial distribution function for iron in native horse spleen ferritin. Physica B: Condensed Matter, 208-209 . pp. 545-546.
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Iron K-edge X-ray absorption spectra were recorded for a sample of freeze-dried horse spleen ferritin over a range of temperatures from 40 to 300 K. Gaussian-type radial distribution functions were fitted to the data from all temperatures simultaneously and the obtained mean-square relative displacements σ2 (EXAFS Debye-Waller factors) were fitted using an Einstein model. For iron atoms in the second and/or third coordination shell an Einstein temperature of 330 ± 20 K was obtained. If oxygen was assumed in the second or third shell, its Einstein temperature was 460 ± 20 K. This indicates that the core of ferritin may have a somewhat more rigid structure than those of previously studied ferritin analogues (polysaccharide iron complexes).
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Copyright:||© 1995 Published by Elsevier B.V.|
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