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a novel potassium channel in photosynthetic cyanobacteria一个新颖的钾通道在光合蓝藻
A Novel Potassium Channel in Photosynthetic Cyanobacteria 1 1 1 2 1 Manuela Zanetti , Enrico Teardo , Nicoletta La Rocca , Lalu Zulkifli , Vanessa Checchetto , Toshiaki 2 2 1 2 1 ` Shijuku , Yuki Sato , Giorgio Mario Giacometti , Noboyuki Uozumi , Elisabetta Bergantino *, Ildiko ` 1* Szabo 1 Department of Biology, University of Padova, Padova, Italy, 2 Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan Abstract Elucidation of the structure-function relationship of a small number of prokaryotic ion channels characterized so far greatly contributed to our knowledge on basic mechanisms of ion conduction. We identified a new potassium channel (SynK) in the genome of the cyanobacterium Synechocystis sp. PCC6803, a photosynthetic model organism. SynK, when expressed in a K+-uptake-system deficient E.coli strain, was able to recover growth of these organisms. The protein functions as a potassium selective ion channel when expressed in Chinese Hamster Ovary cells. The location of SynK in cyanobacteria in both thylakoid and plasmamembranes was revealed by immunogold electron microscopy and Western blotting of isolated membrane fractions. SynK seems to be conserved during evolution, giving rise to a TPK (two-pore K+ channel) family member which is shown here to be located in the thylakoid membrane of Arabidopsis. Our work characterizes a novel cyanobacterial potassium channel and indicates the molecular nature of the first higher plant thylakoid cation
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