Synechocystis mutants defective in manganese uptake regulatory system, ManSR, are hypersensitive to strong light

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• 作者：Anna Zorina ; Maria A. Sinetova ; Elena V. Kupriyanova…
• 关键词：Synechocystis ; Cyanobacteria ; Ions ; Manganese ; Sensors ; Stress ; Transcription factor ; Transporter
• 刊名：Photosynthesis Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：130
• 期：1-3
• 页码：11-17
• 全文大小：1,861 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5079
• 卷排序：130

文摘

High affinity transport of manganese ions (Mn2+) in cyanobacteria is carried by an ABC-type transporter, encoded by the mntCAB operon, which is derepressed by the deficiency of Mn2+. Transcription of this operon is negatively regulated by the two-component system consisting of a sensory histidine kinase ManS and DNA-binding response regulator ManR. In this study, we examined two Synechocystis mutants, defective in ManS and ManR. These mutants were unable to grow on high concentrations of manganese. Furthermore, they were sensitive to high light intensity and unable to recover after short-term photoinhibition. Under standard illumination and Mn2+ concentration, mutant cells revealed the elevated levels of transcripts of genes involved in the formation of Photosystem II (psbA, psbD, psbC, pap-operon). This finding suggests that, in mutant cells, the PSII is sensitive to high concentrations of Mn2+ even at relatively low light intensity.