אסיף מאגר המחקר החקלאי

A putative HCO3/- transporter in the cyanobacterium Synechococcus sp. strain PCC 7942

Year:

1998

Source of publication :

Authors :

Volume :

430

Co-Authors:

Bonfil, D.J., Department of Plant Sciences, Moshe Shilo Avron-Evenari Minerva C., 91904 Jerusalem, Israel
Ronen-Tarazi, M., Department of Plant Sciences, Moshe Shilo Avron-Evenari Minerva C., 91904 Jerusalem, Israel
Sültemeyer, D., Fachbereich Biologie, Univ. Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern, Germany
Lieman-Hurwitz, J., Department of Plant Sciences, Moshe Shilo Avron-Evenari Minerva C., 91904 Jerusalem, Israel
Schatz, D., Department of Plant Sciences, Moshe Shilo Avron-Evenari Minerva C., 91904 Jerusalem, Israel
Kaplan, A., Department of Plant Sciences, Moshe Shilo Avron-Evenari Minerva C., 91904 Jerusalem, Israel

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Abstract:

Cyanobacteria possess an inducible mechanism which enables them to concentrate inorganic carbon (Ci) within the cells. An inactivation library was used to raise the high-CO2-requiring mutant of Synechococcus PCC 7942, IL-2, impaired in HCO3/- transport. Analysis of the relevant genomic DNA detected several modifications, probably due to the single crossover recombination, leading to inactivation of ORF467 (designated ictB) in IL-2. IctB contains 10 trans-membrane regions and is homologous to several transport-related proteins from various organisms. Kinetic analyses of HCO3/- uptake in the wild type and IL-2 suggested the presence of two or three HCO3/- carriers exhibiting different affinities to HCO3/-.

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