Abstract: The invention generally relates to biological engineering of microorganisms and production of chemical compounds therefrom. More particularly, the invention relates to novel genetically engineered microorganisms for the fermentative production of p-aminobenzoic acid and related compounds from fermentable carbon substrates. The biologically derived PABA and related compounds from fermentable carbon substrates can be used in a number of applications including as a food supplement or raw materials for the syntheses of other industrial chemicals or polymers.