The present disclosure relates to methods for increasing heme uptake in a Gram-negative bacterium comprising expressing at least one transgenic heme transport gene in the bacterium. The present disclosure also relates to heme protein production cells comprising at least one transgenic heme transport gene and a heme protein gene and plasmids comprising one or more heme transport genes and a promoter operable to promote expression of the genes by iron depletion or by the addition of an inducer molecule. The present disclosure also relates to systems for heme protein production.
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