Proton-coupled hexose transport in Chlorella vulgaris
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چکیده
منابع مشابه
The Hexose-Proton Cotransport System of Chlorella
The proton concentration in the medium affects the maximal velocity of sugar uptake with a K(m) of 0.3 mM (high affinity uptake). By decreasing the proton concentration a decrease in high affinity sugar uptake is observed, in parallel the activity of a low affinity uptake system (K(m) of 50 mM) rises. Both systems add up to 100%. The existence of the carrier in two conformational states (proton...
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The polyene antibiotic nystatin transforms the sugar-proton contransport system of Chlorella to a mere facilitated diffusion system. This experimental condition was used to test the sugar-translocating unit of the active uptake system for possible essential sulfhydryl groups. It could be shown that the catalyzed translocation of sugar is sensitive to the sulfhydryl-reactive compound N-ethylmale...
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The co-transport mechanism of the coupled movement of D-glucose and Na+ across the brush-border membrane is now universally accepted (for a review, see Crane, 1977). The transport agency shows a stable asymmetry with respect to the plane of the membrane, as demonstrated by its asymmetric inactivation (or reactivation) by little-permeant or impermeant reagents. Comparison was made between little...
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متن کاملThe Hexose - Proton Cotransport System of Chlorella pH - Dependent Change in Km Values and Translocation Constants of the Uptake System
The proton concentration in the medium affects the maximal velocity of sugar uptake with a Km of 0.3 mM (high affinity uptake). By decreasing the proton concentration a decrease in high affinity sugar uptake is observed, in parallel the activity of a low affinity uptake system (K, of 50 mM) rises. Both systems add up to 100 %. The existence of the carrier in two conformational states (protonate...
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ژورنال
عنوان ژورنال: FEBS Letters
سال: 1973
ISSN: 0014-5793
DOI: 10.1016/0014-5793(73)80501-0