Fast Induction of High-Affinity HCO3− Transport in Cyanobacteria

作者: Dieter Sültemeyer , Barbara Klughammer , Murray R Badger , G Dean Price , None

DOI: 10.1104/PP.116.1.183

关键词: BiochemistryDe novo synthesisStaurosporineEnzymeSynechococcusIon transporterOkadaic acidCyanobacteriaCarbonic anhydraseChemistry

摘要: The induction of a high-affinity state the CO 2 -concentration mechanism was investigated in two cyanobacterial species, Synechococcus sp. strain PCC7002 and PCC7942. Cells grown at high concentrations were resuspended low-CO buffer illuminated presence carbonic anhydrase for 4 to 10 min until inorganic C compensation point reached. Thereafter, more than 95% induced both species. Mass-spectrometric analysis HCO 3 − fluxes indicated that only affinity transport increased during fast-induction period, whereas maximum activities not affected. kinetic characteristics uptake remained unchanged. Fast inhibited by chloramphenicol, cantharidin, or okadaic acid. In contrast, fast did occur K252a, staurosporine, genistein, which are known inhibitors protein kinases. These results show can within minutes exposure low-inorganic-C conditions may involve posttranslational phosphorylation existing proteins rather de novo synthesis new components.

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