Abstract
Iron deficiency ends up into several unavoidable consequences including damaging oxidative stress in cyanobacteria. NtcA is a global nitrogen regulator controls wide range of metabolisms in addition to regulation of nitrogen metabolism. In present communication, NtcA based regulation of iron homeostasis, ROS production and cellular phenotype under iron deficiency in Anabaena 7120 has been investigated. NtcA regulates the concentration dependent iron uptake by controlling the expression of furA gene. NtcA also regulated pigment synthesis and phenotypic alterations in Anabaena 7120. A significant increase in ROS production and corresponding reduction in the activities of antioxidative enzymes (SOD, CAT, APX and GR) in CSE2 mutant strain in contrast to wild type Anabaena 7120 also suggested the possible involvement of NtcA in protection against oxidative stress in iron deficiency. NtcA has no impact on the expression of furB and furC in spite of presence of consensus NtcA binding site (NBS) and −10 boxes in their promoter. NtcA also regulates the thylakoid arrangement as well as related photosynthetic and respiration rates under iron deficiency in Anabaena 7120. Overall results suggested that NtcA regulates iron acquisition and in turn protect Anabaena cells from the damaging effects of oxidative stress induced under iron deficiency.
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Acknowledgements
The Head, Department of Botany, Banaras Hindu University, Varanasi, India is gratefully acknowledged for providing laboratory facilities. Authors are also thankful to University Grant Commission and Council of Scientific and Industrial Research (Grant No. 38(1316)/12/EMR-II), New Delhi for providing financial assistance in the form of fellowship (JRF). Advance Instrumentation Research Facility, Jawaharlal Nehru University, New Delhi and Interdisciplinary School of Life Sciences, Banaras Hindu University, Varanasi has been greatly acknowledged for providing Scanning Electron Microscopy (SEM) and Fluorescence Microscopy facility for this work.
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Kaushik, M.S., Srivastava, M., Singh, A. et al. Impairment of ntcA gene revealed its role in regulating iron homeostasis, ROS production and cellular phenotype under iron deficiency in cyanobacterium Anabaena sp. PCC 7120. World J Microbiol Biotechnol 33, 158 (2017). https://doi.org/10.1007/s11274-017-2323-5
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DOI: https://doi.org/10.1007/s11274-017-2323-5