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Modulation of fatty acids and hydrocarbons in Anabaena 7120 and its ntcA mutant under calcium
Author(s) -
Singh Savita,
Verma Ekta,
Tiwari Balkrishna,
Niveshika,
Mishra Arun Kumar
Publication year - 2017
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.201600476
Subject(s) - biochemistry , degree of unsaturation , anabaena , wild type , fatty acid , mutant , polyunsaturated fatty acid , calcium , chemistry , biology , bacteria , cyanobacteria , organic chemistry , gene , genetics
Calcium being a signaling molecule and mediator of cell response, we examined the modulation in fatty acid and hydrocarbon profiles of wild type cyanobacterium Anabaena sp. PCC 7120 and its ntcA mutant under the influence of different calcium chloride concentrations (0–10 mM). Dynamic modifications in fatty acid and hydrocarbon profile were evident through GC‐FID analysis of extracted lipids. In the wild type, increase in CaCl 2 (10 mM) resulted in unsaturation of fatty acids (observed in terms of high MUFA/PUFA ratio) while hydrocarbon production was distinctly high in the mutant strain compared to wild type at all tested concentrations. The synthesis of short chain hydrocarbons (C5–C8) were dominated at inhibitory concentration (10 mM CaCl 2 ) in mutant strain. Results suggest that the increase in MUFA/PUFA ratio at inhibitory concentration in wild type, and higher percentage of hydrocarbons in mutant strain, may be attributed to the survival and acclimation strategies under altered calcium environment. Our results also suggest the involvement of the ntcA gene (master regulator of N 2 metabolism) in regulation of carbon metabolism; specifically fatty acid, hydrocarbon, and other metabolic compounds essential for maintenance and sustenance of growth under stress condition. Thus, our study outlines basic acclimation response along with possibilities of production of fatty acid and hydrocarbon derived biofuel and other bioactive compounds in Anabaena sp. PCC 7120 under altered calcium levels which could be of biotechnological interest.