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Moessbauer spectroscopic studies of hemerythrin from Phascolosoma lurco (syn. Phascolosoma Arcuatum)

Clark, P.E. and Webb, J. (1981) Moessbauer spectroscopic studies of hemerythrin from Phascolosoma lurco (syn. Phascolosoma Arcuatum). Biochemistry, 20 (16). pp. 4628-4632.

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Hemerythrin from coelomic cells of Phascolosoma lurco (syn. P. arcuatum) was isolated by gel filtration as two components, hemerythrin-I (25%) and hemerythrin-I1 (75%). The Mossbauer spectrum of oxyhemerythrin-I1 consisted of two pairs of lines of the same isomer shift (0.5 mm s-I) corresponding to Fe(II1) but different quadrupole splitting (1 -01 and 2.02 mm s-I). Application of a 2.5-T magnetic field at 4.2K caused no significant spectral broadening. The 2Fe.02 binding site thus contains two nonequivalent high-spin Fe(II1) ions that are antiferromagnetically coupled. The Mossbauer spectra of the minor component, hemerythrin-I, indicated an identical binding site. On deoxygenation, the spectrum was dominated by a simple quadrupole split doublet corresponding to Fe(II), indicating that the binding site in this derivative contains two identical Fe(I1) ions that interact only weakly, if at all. The Mossbauer spectra of azidohemerythrin-I1 indicated that this derivative also contains a pair of antiferro- magnetically coupled Fe(II1) ions with the same isomer shift (0.5 mm s-') but quadrupole splittings (1.40 and 1.96 mm s-') that are not identical with those in oxyhemerythrin.

Item Type: Journal Article
Murdoch Affiliation(s): School of Mathematical and Physical Sciences
Publisher: ACS Publications
Copyright: 1981 American Chemical Society
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