Abstract
Communication between plastids and the surrounding cytosol occurs via the plastidic envelope membrane. Recent findings show that the outer membrane is not as freely permeable to low molecular weight solutes as previously thought, but contains different channel-like proteins that act as selectivity filters. The inner envelope membrane contains a variety of metabolite transporters that mediate the exchange of metabolites between both compartments. Two new classes of phosphate antiporters were recently described that are different in structure and function from the known triose phosphate/phosphate translocator from chloroplasts. In addition, a cDNA coding for an ATP/ADP antiporter from plastids was isolated that shows similarities to a bacterial adenylate translocator.
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