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  • Title: Tyrosine transport by membrane vesicles isolated from rat brain.
    Author: Aragón MC, Giménez C, Mayor F, Marvizón JG, Valdivieso F.
    Journal: Biochim Biophys Acta; 1981 Sep 07; 646(3):465-70. PubMed ID: 7284373.
    Abstract:
    Tyrosine uptake by membrane vesicles derived from rat brain has been investigated. The uptake is dependent on an Na+ gradient ([Na+]outside greater than [Na+]inside). The uptake is transport into an osmotically active space and not a binding artifact as indicated by the effect of increasing the medium osmolarity. The process is stimulated by a membrane potential (negative inside) as demonstrated by the effect of the ionophores valinomycin and carbonyl cyanide m-chlorophenylhydrazone and anions with different permeabilities. Kinetic data show that tyrosine is accumulated by two systems with different affinities. Tyrosine uptake is inhibited by the presence of phenylalanine and tryptophan.
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