http://www.cnr.it/ontology/cnr/individuo/prodotto/ID168970
Mechanism of proton/substrate coupling in the heptahelical lysosomal transporter cystinosin (Articolo in rivista)
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- Mechanism of proton/substrate coupling in the heptahelical lysosomal transporter cystinosin (Articolo in rivista) (literal)
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- 2012-01-01T00:00:00+01:00 (literal)
- Alternative label
Ruivo R, Bellenchi GC, Chen X, Zifarelli G, Sagné C, Debacker C, Pusch M, Supplisson S, Gasnier B. (2012)
Mechanism of proton/substrate coupling in the heptahelical lysosomal transporter cystinosin
in Proceedings of the National Academy of Sciences of the United States of America
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- Ruivo R, Bellenchi GC, Chen X, Zifarelli G, Sagné C, Debacker C, Pusch M, Supplisson S, Gasnier B. (literal)
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- Titolo
- Mechanism of proton/substrate coupling in the heptahelical lysosomal transporter cystinosin (literal)
- Abstract
- Secondary active transporters use electrochemical gradients provided by primary ion pumps to translocate metabolites or drugs \"uphill\" across membranes. Here we report the ion-coupling mechanism of cystinosin, an unusual eukaryotic, proton-driven transporter distantly related to the proton pump bacteriorhodopsin. In humans, cystinosin exports the proteolysis-derived dimeric amino acid cystine from lysosomes and is impaired in cystinosis. Using voltage-dependence analysis of steady-state and transient currents elicited by cystine and neutralization-scanning mutagenesis of conserved protonatable residues, we show that cystine binding is coupled to protonation of a clinically relevant aspartate buried in the membrane. Deuterium isotope substitution experiments are consistent with an access of this aspartate from the lysosomal lumen through a deep proton channel. This aspartate lies in one of the two PQ-loop motifs shared by cystinosin with a set of eukaryotic membrane proteins of unknown function and is conserved in about half of them, thus suggesting that other PQ-loop proteins may translocate protons. (literal)
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