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Characterization of the glutamate/aspartate-transport system in a symbioticNostocsp.

✍ Scribed by P. Strasser; G. Falkner

Publisher
Springer-Verlag
Year
1986
Tongue
English
Weight
489 KB
Volume
168
Category
Article
ISSN
0032-0935

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✦ Synopsis

The permeability properties of the cell membrane of a symbiotic Nostoc sp. for glutamate and aspartate were investigated. These compounds were translocated across the plasmalemma by a transport system which showed a very high affinity for glutamate and a lower one for aspartate. Since a concomitant release of glutamate was observed during the uptake of these two amino acids it is concluded that the transport proceeds via a counterexchange mechanism. In addition to this counterexchange a net release of glutamate occurred in the dark. Some aspects concerning the possible function of this transport system in the symbiotic association Geosiphon pyriforme are discussed.

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