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Archives of Microbiology

, Volume 156, Issue 6, pp 471–476 | Cite as

Ammonia rhythm in Microcystis firma studied by in vivo 15N and 31P NMR spectroscopy

  • Rolf Altenburger
  • Sibylle Abarzua
  • Rainer Callies
  • L. Horst Grimme
  • Adalbert Mayer
  • Dieter Leibfritz
Original Papers
  • 56 Downloads

Abstract

Cultures of the cyanobacterium Microcystis firma show rhythmic uptake and release of ammonia under conditions of carbon limitation. The massive removal of ammonia from the medium during the first light phase has little impact on the intracellular pH: a pH shift of less than 0.2 U towards the alkaline can be measured by in vivo 31P NMR. Furthermore, the energy status of the cells remains regulated. In vivo 15N NMR of M. firma, cultivated either with labelled nitrate or ammonia as the sole nitrogen source, reveals only gradual differences in the pool of free amino acids. Additionally both cultivation types show γ-aminobutyric acid, acid amides and yet unassigned secondary metabolites as nitrogen storing compounds. Investigating the incorporation of nitrogen under carbon limitation, however, only the amide nitrogen of glutamine is found permanently labelled in situ. While transamination reactions are blocked, nitrate reduction to ammonia can still proceed. Cation exchange processes in the cell wall are considered regarding the ammonia disappearance in the first phase, and the control of ammonia uptake is discussed with respect to the avoidance of intracellular toxification.

Key words

Ammonia assimilation In vivo 15N and 31P NMR spectroscopy Amino acid metabolism Carbon limitation Cyanobacterium Microcystis firma 

Abbreviations

GABA

γ-aminobutyric acid

GOGAT

glutamate synthase

GS

glutamine synthetase

MDP

methylene diphosphonate

MOPSO

3-(N-morpholino)-2-hydroxy-propanesulfonic acid

NDPS

nucieoside diphosphosugars

NOE

nuclear Overhauser effect

NMR

nuclear magnetic resonance

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Rolf Altenburger
    • 1
  • Sibylle Abarzua
    • 3
  • Rainer Callies
    • 2
  • L. Horst Grimme
    • 1
  • Adalbert Mayer
    • 2
  • Dieter Leibfritz
    • 1
  1. 1.Fachbereich 2, Biologie/ChemieUniversität BremenBremen 33Germany
  2. 2.Fachbereich 1, PhysikUniversität BremenBremen 33Germany
  3. 3.Sektion Biologie, Wissenschaftsbereich Pflanzenphysiologie und BiochemieUniversität RostockRostockGermany

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