An essential role for sodium in the bicarbonate transporting system of the cyanobacterium Anabaena variabilis
Year: 1984
Type: article
Abstract: The apparent photosynthetic affinity of Anabaena variabilis for extracellular inorganic carbon (Ci) was strikingly increased by Na+. The effect was highly specific for Na+ and was maximal at 40 mM Na+. Na+ supply decreased the apparent K m (Ci) of the Ci transporting system and to a lesser extent increased V max. It did not affect photosynthetic rate expressed as a function of intracellular Ci. We infer an effect of Na+ on the Ci transporting system rather than on the photosynthetic machinery itself. We propose several possible models, including Na+‐H+ antiport for maintenance of intracellular pH during HCO3 uptake, and Na+‐HCO− 3 symport.
Source: FEBS Letters
Authors: A. Kaplan, M. Volokita, D. Zenvirth, L. Reinhold
Institution: Hebrew University of Jerusalem
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2016107113