Figure 8.

A working model for the mechanism of the intracellular iron storage pathway in Synechocystis 6803. The pathway of iron flow is represented by dashed black arrows. Fenton reactions, in red, are the hydrogen peroxide-driven oxidation of iron (H₂O₂ + Fe²⁺ → Fe³⁺ + OH⁻ + OH^·); Fe²⁺ can be regenerated in a reaction with superoxide (O₂⁻ + Fe³⁺ → Fe²⁺ + O₂). Protective mechanisms are represented in blue. Circles stand for bacterioferritin (BFR) and MrgA (MRG). OM, Outer membrane; PM, plasma membrane. [See online article for color version of this figure.]