Model of Roseobacter heme utilization and algal host growth.

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Model of Roseobacter heme utilization and algal host growth. Model of Roseobacter heme utilization and algal host growth. (A) During exponential growth, attached bacteria and the algal cell exchange carbon and metabolites in a mutualistic relationship. Bacteria shift their iron acquisition strategy away from heme (blue arrow, downregulation) uptake and toward other “free” iron species (red arrow, upregulation). (B) During algal cell decomposition, bacterial cells potentially transition to a motile growth phase in order to search out a new host while simultaneously targeting newly abundant heme and hemoproteins as iron resources (red arrow, upregulation). Shane L. Hogle et al. mSystems 2017; doi:10.1128/mSystems.00124-16