Document Detail

Nutrient modulated alkaline phosphatase and associated processes in diazotrophic cyanobacteria.
MedLine Citation:
PMID:  16878605     Owner:  NLM     Status:  MEDLINE    
Nutrient regulation of alkaline phosphatase (phosphomonoesterase - PMEase) was studied in some diazotrophic cyanobacterial strains like Anabaena variabilis, Anabaena torulosa, Calothrix brevissima, Scytonema javanicum and Hapalosiphon intricatus, in response to the macronutrients (Phosphate, Calcium and Magnesium) and the micronutrients (Zinc, Copper, Iron and Manganese). The phosphate grown cells of cyanobacterial strains when transferred to the phosphate deficient medium, showed expression of cellular PMEase activity and released the enzyme extracellularly. The increased concentration of phosphate inhibited enzyme activity severely in a concentration dependent manner. The phosphate depletion stimulated spore formation in A. variabilis and H. intricatus, whereas its addition enhanced spore's differentiation in A. torulosa. The switch-on time detected for both cellular and extracellular PMEase varies among the strains. The increase in ionic concentration of Ca2+ enhanced the PMEase activity more profoundly than Mg2+ in diazotrophic strains. The lower level of micronutrients either promoted or had no effect on photosynthetic inhibitors (DCMU) and respiratory electron transport chain inhibitor (sodium azide). It revealed that the energy for the synthesis of PMEase enzyme is mostly derived from photosynthesis and the role of respiratory energy is marginal. The Phosphate (Pi) uptake function in the strains was found to be substrate concentration dependent.
Meenakshee Pandey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Polish journal of microbiology / Polskie Towarzystwo Mikrobiologów = The Polish Society of Microbiologists     Volume:  55     ISSN:  1733-1331     ISO Abbreviation:  Pol. J. Microbiol.     Publication Date:  2006  
Date Detail:
Created Date:  2006-08-01     Completed Date:  2006-08-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101229003     Medline TA:  Pol J Microbiol     Country:  Poland    
Other Details:
Languages:  eng     Pagination:  53-62     Citation Subset:  IM    
Centre of Advance Study in Botany, Banaras Hindu University, Varanasi-221005, India.
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MeSH Terms
Alkaline Phosphatase / metabolism*
Culture Media / chemistry,  metabolism
Cyanobacteria / enzymology*,  physiology
Micronutrients / metabolism*
Nitrogen Fixation / physiology
Spores, Bacterial
Reg. No./Substance:
0/Culture Media; 0/Micronutrients; EC Phosphatase

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