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Acta Crystallogr D Biol Crystallogr. 2004 Feb;60(Pt 2):337-9. Epub 2004 Jan 23.

Crystallization and preliminary X-ray diffraction analysis of an oxidized state of Ohr from Xylella fastidiosa.

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Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão 277, São Paulo SP, Brazil.


Xylella fastidiosa organic hydroperoxide-resistance protein (Ohr) is a dithiol-dependent peroxidase that is widely conserved in several pathogenic bacteria with high affinity for organic hydroperoxides. The protein was crystallized using the hanging-drop vapour-diffusion method in the presence of PEG 4000 as precipitant after treatment with organic peroxide (t-butyl hydroperoxide). X-ray diffraction data were collected to a maximum resolution of 1.8 A using a synchrotron-radiation source. The crystal belongs to the hexagonal space group P6(5)22, with unit-cell parameters a = b = 87.66, c = 160.28 A. The crystal structure was solved by molecular-replacement methods. The enzyme has a homodimeric quaternary structure similar to that observed for its homologue from Pseudomonas aeruginosa, but differs from the previous structure as the active-site residue Cys61 is oxidized. Structure refinement is in progress.

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