dhbC gene is a member of the bacillibactin biosynthetic operon and encodes putative 2,3-dihydroxybenzoate-specific isochorismate synthase DhbC. In closely evolutionarily related species Bacillus subtilis, there are two distinct isochorismate synthase genes dhbC and menF involved in the biosynthesis of siderophore 2,3-dihydroxybenzoate (DHB) and the respiratory chain component menaquinone (MK). Studies of Rowland and Taber (Rowland and Taber 1996) showed that DhbC can compensate for the lack of MenF which is not true the other way around; moreover the depletion of dhbC results in the absence of DHB. Also, dhbC expression is strongly regulated by the presence of iron concentration, which is not a case for menF. Aforementioned studies show the importance of the dhbC in the siderophores biosynthesis.