1.13.11.66: hydroquinone 1,2-dioxygenase

This is an abbreviated version!
For detailed information about hydroquinone 1,2-dioxygenase, go to the full flat file.

Word Map on EC 1.13.11.66

Reaction

benzene-1,4-diol
+
O2
=
(2Z,4E)-4-hydroxy-6-oxohexa-2,4-dienoate

Synonyms

HQDO, hydroquinone 1,2-dioxygenase, hydroquinone dioxygenase, LinE, mnpC, PcpA, PdcDE, PnpC1, PnpC2, PnpCD, two-subunit hydroquinone 1,2-dioxygenase, type II HQDO, YaiA

ECTree

     1 Oxidoreductases
         1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)
             1.13.11 With incorporation of two atoms of oxygen
                1.13.11.66 hydroquinone 1,2-dioxygenase

Crystallization

Crystallization on EC 1.13.11.66 - hydroquinone 1,2-dioxygenase

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CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
purified full-length or proteolytically truncated PnpCD in apo form and in complex with Fe3+ or substrate analogue hydroxybenzonitrile and Cd2+, i.e. apo-PnpCD, PnpCD-Fe3+, and PnpCD-Cd2+-HBN, sitting-drop vapor diffusion method, 15-20 mg/ml protein in 10mM Tris-HCl, pH 8.0, and 100 mM NaCl, is mixed with reservoir solution containing 0.2 M sodium thiocyanate, 20% w/v PEG 3350, 20°C, method optimization, X-ray diffraction structure determination and analysis
C1I210; C1I209
generation of a homology model, based on zinc protein PDB entry 1ZSW, which predicts that the tertiary structure of the enzyme differs significantly from that of the extradiol dioxygenases, and that the residues ligating the Fe(II) are H11, H227, and E276
purified enzyme free or in complex with substrate methylhydroquinone under anaerobic conditions, or with inhibitors 4-hydroxybenzoate and 4-nitrophenol, sitting drop vapor diffusion method, mixing of 0.001 ml of 8 mg/ml protein in 25 mM Tris, pH 7.0, 5 mM NaCl, and 0.5 mM ligand, with 0.001 ml of reservoir solution containing 14% PEG 3350, 0.35 M MgCl2, and 0.1 M MES, pH 6.5, 4°C, 1 day, the structure of the free enzyme is obtained by soaking the crystals in a stabilizing solution containing 16% PEG 3350, 0.35 M MgCl2, and 0.1 M MES, pH 6.5, for two days, changing the solution three times, in order to remove the ligands, X-ray diffraction structure determination and analysis at 1.90-2.40 resolution, molecular replacement using the coordinates of PnpCD structure from Pseudomonas sp. strain WBC-3, PDB ID 4ZXA as template, modeling