2zgi

Publication Abstract from PubMed

The pyridoxal 5'-phosphate-dependent enzyme 4-amino-4-deoxychorismate lyase converts 4-amino-4-deoxychorismate to p-aminobenzoate and pyruvate in one of the crucial steps in the folate-biosynthesis pathway. The primary structure of the hypothetical protein TTHA0621 from Thermus thermophilus HB8 suggests that TTHA0621 is a putative 4-amino-4-deoxychorismate lyase. Here, the crystal structure of TTHA0621 is reported at 1.93 A resolution. The asymmetric unit contained four NCS molecules related by 222 noncrystallographic symmetry, in which the formation of intact dimers may be functionally important. The cofactor pyridoxal 5'-phosphate (PLP) binds to the protein in the large cleft formed by the N-terminal and C-terminal domains of TTHA0621. The high structural similarity and the conservation of the functional residues in the catalytic region compared with 4-amino-4-deoxychorismate lyase (PabC; EC 4.1.3.38) from Escherichia coli suggest that the TTHA0621 protein may also possess 4-amino-4-deoxychorismate lyase activity.

Structure of putative 4-amino-4-deoxychorismate lyase from Thermus thermophilus HB8.,Padmanabhan B, Bessho Y, Ebihara A, Antonyuk SV, Ellis MJ, Strange RW, Kuramitsu S, Watanabe N, Hasnain SS, Yokoyama S Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Dec 1;65(Pt, 12):1234-9. Epub 2009 Nov 27. PMID:20054118^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.