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Differential scanning calorimetry was employed to investigate the structure of spinach (Spinacia oleracea) chloroplast membranes. In a low ionic strength Hepes-buffered medium, major calorimetric transitions were resolved at 42.5 degrees C. (A), 60.6 degrees C (B), 64.9 degrees C (C(1)), 69.6 degrees C (C(2)), 75.8 degrees C (D), 84.3 degrees C (E), and 88.9 degrees C (F). A lipid melting transition was also commonly seen at 17 degrees C in scans starting at lower temperatures. The D transition was demonstrated by four independent methods to derive from denaturation of the light harvesting complex associated with photosystem II (LHC-II). Evidence for this conclusion was as follows: (a) the endotherm of the isolated LHC-II (74.0 degrees C) was very similar to that of D (75.8 degrees C); (b) the denaturation temperature of the 27 kilodalton LHC-II polypeptide determined in intact chloroplast membranes by thermal gel analysis was identical to the temperature of the D transition at pH 7.6 and after destabilization by shifting the pH to 6.6 or by addition of Mg(2+); (c) analysis of the stability of the LHC-II complex by electrophoresis in native gels demonstrated that the complex dissociates during the D transition, both at pH 7.6 and 6.6; and (d) the 77 Kelvin fluorescence maximum of LHC-II in chloroplasts was seen to shift to lower wavelengths (indicating gross denaturation of LHC-II), at the temperature of the D transition when examined at either of the above pHs. With this identification, five of the eight major endotherms of the chloroplast membrane have now been assigned.

Identification and Partial Characterization of the Denaturation Transition of the Light Harvesting Complex II of Spinach Chloroplast Membranes