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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

para-aminobenzoate synthesis from chorismate occurs in two steps.

Escherichia coli p-aminobenzoate synthase is composed of two nonidentical subunits encoded by pabA and pabB and has been assumed to be the sole enzyme responsible for p-aminobenzoate biosynthesis from chorismate and glutamine. Plasmids were constructed that overproduce the p-aminobenzoate synthase subunits 250-500-fold. Partial purification of the subunits revealed that they form a diffusible intermediate that is subsequently converted to p-aminobenzoate by a second enzyme (Mr = 49,000) temporarily designated enzyme X.[1]


  1. para-aminobenzoate synthesis from chorismate occurs in two steps. Nichols, B.P., Seibold, A.M., Doktor, S.Z. J. Biol. Chem. (1989) [Pubmed]
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