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Is HCO3− Transport in Anabaena a Na+ Symport?

Lenora Reinhold, Micha Volokita, Drora Zenvirth, Aaron Kaplan

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Abstract

Na(+) strongly promoted HCO(3) (-) transport in Anabaena variabilis. The effect was highly specific to this cation. Kinetic analysis indicated a progressive decrease in the K(m) (HCO(3) (-)) of the transport system with increasing Na(+) concentration. V(max) was also affected. We raise the possibility that the transport is a Na(+)-HCO(3) (-) symport; alternatively, that a Na(+)-H(+) antiport (or Na(+)-OH(+) symport) system mediates the efflux of the OH(-) ions derived from the entering HCO(3) (-) ions, and that this antiport can rate-limit HCO(3) (-) influx.

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What this paper is about

Na(+) strongly promoted HCO(3) (-) transport in Anabaena variabilis. The effect was highly specific to this cation. Kinetic analysis indicated a progressive decrease in the K(m) (HCO(3) (-)) of the transport system with increasing Na(+) concentration. V(max) was also affected. We raise the possibility that the transport is a Na(+)-HCO(3) (-) symport; alternatively, that a Na(+)-H(+) antiport (or Na(+)-OH(+) symport) system mediates the efflux of the OH(-) ions derived from the entering HCO(3) (-) ions, and that this antiport can rate-limit HCO(3) (-) influx.

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Available abstract

Na(+) strongly promoted HCO(3) (-) transport in Anabaena variabilis. The effect was highly specific to this cation. Kinetic analysis indicated a progressive decrease in the K(m) (HCO(3) (-)) of the transport system with increasing Na(+) concentration. V(max) was also affected. We raise the possibility that the transport is a Na(+)-HCO(3) (-) symport; alternatively, that a Na(+)-H(+) antiport (or Na(+)-OH(+) symport) system mediates the efflux of the OH(-) ions derived from the entering HCO(3) (-) ions, and that this antiport can rate-limit HCO(3) (-) influx.

Key concepts: Symporter, Antiporter, Anabaena variabilis, Membrane transport, Chemistry, Ion transporter, Efflux, Ion

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