Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Iron Starvation-Induced Proteomic Changes in Anabaena (Nostoc) sp. PCC 7120: Exploring Survival Strategy

  • Narayan, Om Prakash (Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University) ;
  • Kumari, Nidhi (Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University) ;
  • Rai, Lal Chand (Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University)
  • Received : 2010.09.13
  • Accepted : 2010.11.04
  • Published : 2011.02.28
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Abstract

This study provides first-hand proteomic data on the survival strategy of Anabaena sp. PCC 7120 when subjected to long-term iron-starvation conditions. 2D-gel electrophoresis followed by MALDI-TOF/MS analysis of iron-deficient Anabaena revealed significant and reproducible alterations in ten proteins, of which six are associated with photosynthesis and respiration, three with the antioxidative defense system, and the last, hypothetical protein all1861, conceivably connected with iron homeostasis. Iron-starved Anabaena registered a reduction in growth, photosynthetic pigments, PSI, PSII, whole-chain electron transport, carbon and nitrogen fixation, and ATP and NADPH content. The kinetics of hypothetical protein all1861 expression, with no change in expression until day 3, maximum expression on the $7^{th}$ day, and a decline in expression from the $15^{th}$ day onward, coupled with in silico analysis, suggested its role in iron sequestration and homeostasis. Interestingly, the up-regulated FBP-aldolase, Mn/Fe-SOD, and all1861 all appear to assist the survival of Anabeana subjected to iron-starvation conditions. Furthermore, the $N_2$-fixation capabilities of the iron-starved Anabaena encourage us to recommend its application as a biofertilizer, particularly in iron-limited paddy soils.

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