Reconciling cyanobacterial fixed-nitrogen distributions and transport experiments with quantitative modelling

Details Reconciling cyanobacterial fixed-nitrogen distributions and transport experiments with quantitative modelling Reconciling cyanobacterial fixed-nitrogen distributions and transport experiments with quantitative modelling

2011-12-14

arxiv.org/abs/1112.3245v1

Phys. Biol. (2012) 9 016007

Physics

Biological Physics

This is an author-created, un-copyedited version of an article accepted for publication in Physical Biology. IOP Publishing Lt

Scientific paper

10.1088/1478-3975/9/1/016007

Filamentous cyanobacteria growing in media with insufficient fixed nitrogen differentiate some cells into heterocysts, which fix nitrogen for the remaining vegetative cells. Transport studies have shown both periplasmic and cytoplasmic connections between cells that could transport fixed-nitrogen along the filament. Two experiments have imaged fixed-nitrogen distributions along filaments. In 1974,Wolk et al found a peaked concentration of fixed-nitrogen at heterocysts using autoradiographic techniques. In contrast, in 2007, Popa et al used nanoSIMS to show large dips at the location of heterocysts, with a variable but approximately level distribution between them. With an integrated model of fixed-nitrogen transport and cell growth, we recover the results of both Wolk et al and of Popa et al using the same model parameters. To do this, we account for immobile incorporated fixed-nitrogen and for the differing durations of labeled nitrogen fixation that occurred in the two experiments. The variations seen by Popa et al are consistent with the effects of cell-by-cell variations of growth rates, and mask diffusive gradients. We are unable to rule out a significant amount of periplasmic fN transport.

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