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Single-molecule transport kinetics of a glutamate transporter homolog shows static disorder.


ABSTRACT: Kinetic properties of membrane transporters are typically poorly defined because high-resolution functional assays analogous to single-channel recordings are lacking. Here, we measure single-molecule transport kinetics of a glutamate transporter homolog from Pyrococcus horikoshii, GltPh, using fluorescently labeled periplasmic amino acid binding protein as a fluorescence resonance energy transfer-based sensor. We show that individual transporters can function at rates varying by at least two orders of magnitude that persist for multiple turnovers. A gain-of-function mutant shows increased population of the fast-acting transporters, leading to a 10-fold increase in the mean transport rate. These findings, which are broadly consistent with earlier single-molecule measurements of GltPh conformational dynamics, suggest that GltPh transport is defined by kinetically distinct populations that exhibit long-lasting "molecular memory."

SUBMITTER: Ciftci D 

PROVIDER: S-EPMC7259943 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Single-molecule transport kinetics of a glutamate transporter homolog shows static disorder.

Ciftci Didar D   Huysmans Gerard H M GHM   Wang Xiaoyu X   He Changhao C   Terry Daniel D   Zhou Zhou Z   Fitzgerald Gabriel G   Blanchard Scott C SC   Boudker Olga O  

Science advances 20200529 22


Kinetic properties of membrane transporters are typically poorly defined because high-resolution functional assays analogous to single-channel recordings are lacking. Here, we measure single-molecule transport kinetics of a glutamate transporter homolog from <i>Pyrococcus horikoshii</i>, Glt<sub>Ph</sub>, using fluorescently labeled periplasmic amino acid binding protein as a fluorescence resonance energy transfer-based sensor. We show that individual transporters can function at rates varying b  ...[more]

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