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. 1982 Jan;79(2):400-2.
doi: 10.1073/pnas.79.2.400.

Giant circular dichroism of high molecular weight chlorophyllide-apomyoglobin complexes

R M Pearlstein  1 , R C Davis, S L Ditson
Affiliations

Giant circular dichroism of high molecular weight chlorophyllide-apomyoglobin complexes

R M Pearlstein et al. Proc Natl Acad Sci U S A. 1982 Jan.

Abstract

Chlorophyllide a and the apoprotein of myoglobin (Mb) spontaneously form three types of complex. The M (M(r) approximately 3 x 10(5)) and H (M(r) >/= 4 x 10(6)) complexes, but not the L (M(r) approximately 1.7 x 10(4)), display a circular dichroism (CD) spectrum that is highly red-shifted, nonconservative, and very intense-characteristics shared by the CD spectra of reaction center complexes from purple photosynthetic bacteria. At its 710-nm peak, the H complex CD spectrum has a larger magnitude, 0.06 differential absorbance per unit total absorbance, than has been reported for chlorophyll in any medium.

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