The stacking of chloroplast thylakoids: Quantitative analysis of the balance of forces between thylakoid membranes of chloroplasts,and the role of divalent cations |
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Authors: | MJ Sculley JT Duniec SW Thorne WS Chow NK Boardman |
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Institution: | CSIRO, Division of Plant Industry, P.O. Box 1600, Canberra, Australian Capital Territory, 2601, Australia |
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Abstract: | An analysis is made of the van der Waals dispersion attractive forces and electrostatic repulsive forces between the grana thylakoid membranes of chloroplasts. These forces are determined for negatively charged surfaces with a pKa value of 4.7 for a bulk pH of 7.0 with a range of mono- and divalent cation concentrations and intermembrane spacing in the range 10 to 80 Å. For equilibrium under dark conditions, it is concluded that either there is extensive electrostatic binding of divalent cations (Mg2+) to the negatively charged membrane groups (phospholipid, sulfolipid, and protein carboxyl), or a redistribution of these groups between stacked and unstacked regions must be invoked. |
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Keywords: | To whom all correspondence and requests for reprints should be addressed |
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