Catalyzes the conversion of 5-phosphoribosylanthranilate to l-(O-carboxyphenylamino)-l-deoxyribulose-5-phosphate, which is the third step of the tryptophan biosynthetic pathway. N-(5-phospho-beta-D-ribosyl)anthranilate = 1-(2-carboxyphenylamino)-1-deoxy-D-ribulose 5-phosphate Amino-acid biosynthesis; L-tryptophan biosynthesis; L-tryptophan from chorismate: step 3/5. A number of isoforms are produced. According to EST sequences. Expressed in roots and shoots. By silver nitrate and UV irradiation. Bushy morphology, reduced fertility, blue fluorescence under UV light and resistance to the anthranilate analog 6-methylanthranilate. Belongs to the TrpF family.