Apr 1, 1974

Chloroplast grana membrane carboxyl groups: their involvement in membrane association

Plant Physiology
S BergR A Dilley

Abstract

Chloroplast membrane carboxyl groups were modified by carbodiimide activation followed by glycine methyl ester substitution, leaving the derivatized group uncharged. This charge alteration induced a number of effects similar to addition of salts to control chloroplasts suspended in a low salt medium. These include: (a) restacking or multiple membrane association in low salt-treated chloroplasts that lack grana stacks, (b) protection against polycation inhibition of photosystem I electron transfer, (c) reduction of the amount of polycations bound to the membranes, and (d) increased 90 degrees light scattering due to membrane conformational changes. Carboxyl modification also altered acid-induced conformational changes.These effects are interpretated as the results of the reduction in the surface negative charge contributed by carboxyl groups. Membrane structure at both a local, polyelectrolyte level and at the level of membrane-membrane interaction (stacking) is controlled in part by these negative, charged groups.

  • References12
  • Citations16

Mentioned in this Paper

Tissue Membrane
Membrane
Electron Transport
Chloroplasts
Glycine
Chloroplast Membrane
Grana
Glycine (Plant)
Metabolic Inhibition
Esters

About this Paper

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