Comparison of the results obtained from the thermodynamic characterization of PpcA mutants at pH 7.5.

For comparison the values previously obtained for PpcA, PpcB, PpcD and PpcE [17] and PpcAM58 mutants [29] were also included. Δeapp (2nd/1st) is the difference between the eapp values of the second and the first heme to oxidized. Δeapp (3rd/2nd) is the difference between the eapp values of the third and second heme to oxidized.