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Purification, characterization and crystallization of thermostable anthranilate phosphoribosyltransferase from
A Ivens1, O Mayans, H Szadkowski
1Institut für Biochemie der Universität zu Köln, Germany; EMBL-Hamburg Outstation, Hamburg, Germany. andreas.ivens@uni-koeln.de
Abstract:
Anthranilate phosphoribosyltransferase (TrpD; EC 2.4.2.18) from the hyperthermophilic archaeon Sulfolobus solfataricus (ssTrpD) was expressed in Escherichia coli, purified and crystallized. Analytical gel permeation chromatography revealed a homodimeric composition of the enzyme. The steady-state kinetic characteristics suggest tight binding of the substrate anthranilic acid and efficient catalysis at the physiological growth temperature of S. solfataricus. Crystals of ssTrpD diffract to better than 2.6 A resolution and preliminary X-ray characterization was carried out. The crystals are suitable for structure determination.
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