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Crystal structure of pyrogallol phloroglucinoltranshydroxylase, an Mo enzyme capable ofintermolecular hydroxyl transfer between phenols

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2004

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Messerschmidt, Albrecht
Niessen, Holger
Abt, Dietmar J.
Einsle, Oliver

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PNAS ( Proceedings of the National Academy of Sciences. 2004, 101(32), pp. 11571-11576

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The Mo enzyme transhydroxylase from the anaerobic microorganism Pelobacter acidigallici catalyzes the conversion of pyrogallol to phloroglucinol. Such trihydroxybenzenes and their derivatives represent important building blocks of plant polymers. None of the transferred hydroxyl groups originates from water during transhydroxylation; instead a cosubstrate, such as 1,2,3,5-tetrahydroxybenzene, is used in a reaction without apparent electron transfer. Here, we report on the crystal structure of the enzyme in the reduced Mo(IV) state, which we solved by single anomalousdiffraction technique. It represents the largest structure (1,149 amino acid residues per molecule, 12 independent molecules per unit cell), which has been solved so far by single anomalousdiffraction technique. Tranhydroxylase is a heterodimer, with the active Mo molybdopterin guanine dinucleotide (MGD)2 site in the α-subunit, and three [4FeO4S] centers in the β-subunit. The latter subunit carries a seven-stranded, mainly antiparallel β-barrel domain. We propose a scheme for the transhydroxylation reaction based on 3D structures of complexes of the enzyme with various polyphenols serving either as substrate or inhibitor.

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570 Biowissenschaften, Biologie

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ISO 690MESSERSCHMIDT, Albrecht, Holger NIESSEN, Dietmar J. ABT, Oliver EINSLE, Bernhard SCHINK, Peter M. H. KRONECK, 2004. Crystal structure of pyrogallol phloroglucinoltranshydroxylase, an Mo enzyme capable ofintermolecular hydroxyl transfer between phenols. In: PNAS ( Proceedings of the National Academy of Sciences. 2004, 101(32), pp. 11571-11576
BibTex
@article{Messerschmidt2004Cryst-8404,
  year={2004},
  title={Crystal structure of pyrogallol phloroglucinoltranshydroxylase, an Mo enzyme capable ofintermolecular hydroxyl transfer between phenols},
  number={32},
  volume={101},
  journal={PNAS ( Proceedings of the National Academy of Sciences},
  pages={11571--11576},
  author={Messerschmidt, Albrecht and Niessen, Holger and Abt, Dietmar J. and Einsle, Oliver and Schink, Bernhard and Kroneck, Peter M. H.}
}
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