Ktr-Mediated Potassium Transport, a Major Pathway for Potassium Uptake, Is Coupled to a Proton Gradient Across the Membrane in Synechocystis sp. PCC 6803

Nobuyuki MATSUDA; Nobuyuki UOZUMI

doi:10.1271/bbb.70.273

Biochemistry & Molecular Biology Notes

Ktr-Mediated Potassium Transport, a Major Pathway for Potassium Uptake, Is Coupled to a Proton Gradient Across the Membrane in Synechocystis sp. PCC 6803

Nobuyuki MATSUDA, Nobuyuki UOZUMI

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Keywords: potassium, transporter, proton motive force, osmoregulation

JOURNAL FREE ACCESS

2006 Volume 70 Issue 1 Pages 273-275

DOI https://doi.org/10.1271/bbb.70.273

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Abstract

Synechocystis sp. PCC 6803 contains a Ktr system and a putative ATP-dependent Kdp system for potassium uptake. We report here that the Kdp system plays only a minor role in potassium uptake under salt and non-stress conditions, unlike the role it plays in Escherichia coli. In Synechocystis, Ktr-mediated potassium transport is dependent on the proton gradient across the membrane.

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