Crystallization and preliminary X-ray analysis of the ergothioneine-biosynthetic methyltransferase EgtD.
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Issue Date
2014-05
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Show full item recordAbstract
Ergothioneine is an amino-acid betaine derivative of histidine that was discovered more than one century ago. Despite significant research pointing to a function in oxidative stress defence, the exact mechanisms of action of ergothioneine remain elusive. Although both humans and bacterial pathogens such as Mycobacterium tuberculosis seem to depend on ergothioneine, humans are devoid of the corresponding biosynthetic enzymes. Therefore, its biosynthesis may emerge as potential drug target in the development of novel therapeutics against tuberculosis. The recent identification of ergothioneine-biosynthetic genes in M. smegmatis enables a more systematic study of its biology. The pathway is initiated by EgtD, a SAM-dependent methyltransferase that catalyzes a trimethylation reaction of histidine to give N(α),N(α),N(α)-trimethylhistidine. Here, the recombinant production, purification and crystallization of EgtD are reported. Crystals of native EgtD diffracted to 2.35 Å resolution at a synchrotron beamline, whereas crystals of seleno-L-methionine-labelled protein diffracted to 1.75 Å resolution and produced a significant anomalous signal to 2.77 Å resolution at the K edge. All of the crystals belonged to space group P212121, with two EgtD monomers in the asymmetric unit.Citation
Crystallization and preliminary X-ray analysis of the ergothioneine-biosynthetic methyltransferase EgtD. 2014, 70 (Pt 5):676-80 Acta Crystallogr F Struct Biol CommunAffiliation
Dept of structure and functions of proteins, Hemholtz Centre for infection research, Inhoffenstr. 7, D-38124 Braunschweig, Germany.PubMed ID
24817736Type
ArticleLanguage
enISSN
2053-230Xae974a485f413a2113503eed53cd6c53
10.1107/S2053230X1400805X
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