5NOF

Anthranilate phosphoribosyltransferase from Thermococcus kodakaraensis

5NOF の概要

• エントリーDOI: 10.2210/pdb5nof/pdb
• 分子名称: Anthranilate phosphoribosyltransferase, ZINC ION, SODIUM ION, ... (5 entities in total)
• 機能のキーワード: tryptophan biosynthesis, phosphoribosyltransferase, transferase
• 由来する生物種: Thermococcus kodakarensis (strain ATCC BAA-918 / JCM 12380 / KOD1)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 69236.03

構造登録者

Perveen, S.,Rashid, N.,Papageorgiou, A.C. (登録日: 2017-04-12, 公開日: 2017-11-29, 最終更新日: 2024-01-17)

主引用文献

Perveen, S.,Rashid, N.,Tang, X.F.,Imanaka, T.,Papageorgiou, A.C.
Anthranilate phosphoribosyltransferase from the hyperthermophilic archaeon Thermococcus kodakarensis shows maximum activity with zinc and forms a unique dimeric structure.
FEBS Open Bio, 7:1217-1230, 2017

PubMed Abstract: Anthranilate phosphoribosyltransferase (TrpD) is involved in tryptophan biosynthesis, catalyzing the transfer of a phosphoribosyl group to anthranilate, leading to the generation of phosphoribosyl anthranilate. TrpD belongs to the phosphoribosyltransferase (PRT) superfamily and is the only member of the structural class IV. X-ray structures of TrpD from seven species have been solved to date. Here, functional and structural characterization of a recombinant TrpD from hyperthermophilic archaeon KOD1 (TrpD) was carried out. Contrary to previously characterized Mg-dependent TrpD enzymes, TrpD was found to have a unique divalent cation dependency characterized by maximum activity in the presence of Zn (1580 μmol·min·mg, the highest reported for any TrpD) followed by Ca (948 μmol·min·mg) and Mg (711 μmol·min·mg). TrpD displayed an unusually low thermostability compared to other previously characterized proteins from KOD1. The crystal structure of TrpD was determined in free form and in the presence of Zn to 1.9 and 2.4 Å resolutions, respectively. TrpD structure displayed the typical PRT fold similar to other class IV PRTs, with a small N-terminal α-helical domain and a larger C-terminal α/β domain. Electron densities for Zn were identified at the expected zinc-binding motif, DE(217-218), of the enzyme in each subunit of the dimer. Two additional Zn were found at a new dimer interface formed in the presence of Zn. A fifth Zn was found bound to Glu118 at crystal lattice contacts and a sixth one was ligated with Glu235. Based on the TrpD-Zn structure, it is suggested that the formation of a new dimer may be responsible for the higher enzyme activity of TrpD in the presence of Zn ions.

PubMed: 28781961
DOI: 10.1002/2211-5463.12264

実験手法

X-RAY DIFFRACTION (2.42 Å)