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Biophysical Journal 12: 774-790 (1972)
© 1972 the Biophysical Society

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Direct and Indirect Mechanisms of Deaggregation by Fatty Acids in Chilorophyll-Containing Systems

M. Brody and B. Nathanson

ABSTRACT

The ability of an exogenous long-chain unsaturated fatty acid (linolenic acid) to induce changes in the circular dichroism (C.D.) spectra of chlorophyllous systems of various levels of organization is demonstrated and attributed to its deaggregating influence. In the case of chlorophyll in solution (CCl4 or CCl4-hexane), deaggregation is by direct action on the chromophore. Evidence is also given for an indirect mechanism when chlorophyll is attached to protein (e.g., in HP-700 complexes); in this case, deaggregation results from a conformational change in the protein. Interpretations are given for the differences in C.D. spectra of nonmembranous and membranous chlorophyll-containing systems. (The latter include "digitonin-isolated" system I particles, subchloroplast particles obtained by means of sonication, and specially prepared intact chloroplasts.)






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Copyright © 1972 by the Biophysical Society.