Information about previous phosphate fluctuations is stored via an adaptive response of the high-affinity phosphate uptake system of the cyanobacterium Anacystis nidulans

Wagner, Ferdinand; Falkner, Renate; Falkner, Gernot

doi:10.1007/bf00239951

Cited by 37 publications

(27 citation statements)

References 26 publications

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“…A similar behavior has been previously observed with the unicellular cyanobacterium Anacystis nidulans. 1,2,14 We therefore may conclude that only adapted states of the uptake system of these organisms are characterized by an extended range of validity of the linear relationship between the flux of phosphate into the cell and the driving force for this process. The curve fitting for the time course of the decrease of the external concentration has therefore been interpreted accordingly (see below).…”

Section: Resultsmentioning

confidence: 99%

“…1,2,14 When the uptake system was adapted to concentrations that were much higher than the threshold value, a linear relationship extended from the threshold value to high external concentrations. In contrast, under nonadapted conditions under which the uptake system even adapted to the external concentrations employed in the experiment during the course of the investigation, a non-linear dependence was observed.…”

Section: Methodsmentioning

confidence: 99%

“…The "linear behavior" is maintained for a prolonged period of time, when the external concentration has decreased to the threshold value again. 1,2 This is a precondition for the observed transfer of information from one pulse to the next. At the threshold value an intermediary stable state "without load" preserves the energetic and kinetic properties of the stable state, attained during operation "with load".…”

Section: Interpretation Of Adaptive Events As Possible Elements Of a mentioning

confidence: 99%

“…Under phosphate limiting growth conditions cyanobacteria develop the capability of interpreting fluctuations in the external phosphate concentration as a signal for instigation of a distinct adaptive behavior, in which the phosphate uptake system is reconstructed [1][2][3] and information about preceding phosphate exposures is processed. 4,5 The biological significance of this behavior can be deduced from the nutrient situation in oligotrophic lakes, in which the formation of phytoplankton biomass is limited by the amount of inflowing phosphate.…”

Section: Introductionmentioning

confidence: 99%

“…6 Under this condition the phosphate concentration decreases to such low levels that the uptake system has not sufficient energy to overcome the existing concentration gradient across the cell membrane. 2,3 In such a situation cyanobacteria and algae can only grow, when the external concentration exceeds, at least occasionally, a characteristic threshold value above which available energy suffices for the transport into the cell. Phosphate is then incorporated at a high rate and stored in the form of polyphosphate granules that serve as the actual phosphorus source for the proliferating cell.…”

Section: Introductionmentioning

confidence: 99%

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Information Processing by Cyanobacteria During Adaptation to Environmental Phosphate Fluctuations

Falkner¹,

Priewasser

Falkner³

2006

Plant Signaling & Behavior

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Phosphate limited grown Anabaena variabilis has the capability of processing information about external phosphate fluctuations by means of interconnected adaptive events. Adaptive events are physiological processes that are characterized by two opposite manifestations, namely adapted states and adaptive operation modes. In adapted states the energy-converting constituents of the uptake system operate under the prevailing external conditions in a coherent manner with least energy dissipation. Adaptive operation modes take place when adapted states are disturbed by persistent changes in phosphate supply. In this mode the outcome of former adaptations to elevated phosphate levels guides the emergence of a new adapted state. The influence of antecedent adapted states on subsequent adaptations was studied experimentally and characteristic examples for such information processing are given. The theory of self-referential systems allowed analyzing these examples. For this purpose adaptive events had to be considered as elements of a communicating network, in which, along a historic succession of alternating adapted states and adaptive operation modes, information pertaining to the self-preservation of the organism is transferred from one adaptive event to the next: the latter "interprets" environmental changes by means of distinct adaptive operation modes, aimed at preservation of the organism. The result of this interpretation is again leading to a coherent state that is passed on to subsequent adaptive events. A generalization of this idea to the adaptive interplay of other energy converting subsystems of the cell leads to the dynamic view of cellular information processing in which the organism recreates itself in every new experience.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Interpretation Of Adaptive Events As Possible Elements Of a mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Information Processing by Cyanobacteria During Adaptation to Environmental Phosphate Fluctuations

Falkner¹,

Priewasser

Falkner³

2006

Plant Signaling & Behavior

Self Cite

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Some characteristics of arsenate transport in a marine cyanobacterium, Synechococcus sp.

Takahashi

Kawakami

Iwakiri

et al. 2001

Applied Organom Chemis

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The mechanism of arsenate incorporation in the cells of a unicellular marine cyanobacterium, Synechococcus sp., was investigated. A lag period in arsenate incorporation, probably caused by an inhibitory effect of phosphate absorbed on the cell surface, was observed. Although arsenate incorporation into the cells of cyanobacterium was several times faster than that of phosphate, it was readily inhibited by addition of phosphate, also suggesting inhibition caused by phosphate. The Michaelis-Menten type of equation was employed for the simulation of incorporation, and a nonlinear fitting was applied for the estimation of the kinetic parameters in the equation. Analysis based on the assumption that arsenate is incorporated via the phosphate transport system in cells suggested that arsenate competes with phosphate for entry into cells and each species acts as a competitive inhibitor to each other. The affinity of arsenate with the transport system was much less than that of phosphate, but it was not low enough for elucidation of an almost complete inhibition of arsenate incorporation by phosphate, and another mechanism to block the approach of arsenate to the transport system was deduced to exist. The inhibitory effect of phosphate on arsenate incorporation seemed responsible for alleviation of the toxicity of arsenate in the cells.

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Nutrient Limitation of Freshwater Cyanobacteria

Dignum¹,

Matthijs²,

Pel³

et al.

Aquatic Ecology Series

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Information about previous phosphate fluctuations is stored via an adaptive response of the high-affinity phosphate uptake system of the cyanobacterium Anacystis nidulans

Cited by 37 publications

References 26 publications

Information Processing by Cyanobacteria During Adaptation to Environmental Phosphate Fluctuations

Information Processing by Cyanobacteria During Adaptation to Environmental Phosphate Fluctuations

Some characteristics of arsenate transport in a marine cyanobacterium, Synechococcus sp.

Nutrient Limitation of Freshwater Cyanobacteria

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