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Spectroscopic properties of rubber oxygenase RoxA from Xanthomonas sp., a new type of dihaem dioxygenase

Spectroscopic properties of rubber oxygenase RoxA from Xanthomonas sp., a new type of dihaem dioxygenase

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SCHMITT, Georg, Grazyna SEIFFERT, Peter M. H. KRONECK, Reinhard BRAAZ, Dieter JENDROSSEK, 2010. Spectroscopic properties of rubber oxygenase RoxA from Xanthomonas sp., a new type of dihaem dioxygenase. In: Microbiology. 156(8), pp. 2537-2548. ISSN 1350-0872. eISSN 1465-2080

@article{Schmitt2010-08-02Spect-36514, title={Spectroscopic properties of rubber oxygenase RoxA from Xanthomonas sp., a new type of dihaem dioxygenase}, year={2010}, doi={10.1099/mic.0.038992-0}, number={8}, volume={156}, issn={1350-0872}, journal={Microbiology}, pages={2537--2548}, author={Schmitt, Georg and Seiffert, Grazyna and Kroneck, Peter M. H. and Braaz, Reinhard and Jendrossek, Dieter} }

Braaz, Reinhard eng Natural rubber [poly-(cis-1,4-isoprene)] is cleaved to 12-oxo-4,8-dimethyltrideca-4,8-diene-1-al (ODTD) by rubber oxygenase A (RoxA) isolated from Xanthomonas sp. RoxA has two c-type haem centres that show two distinct alpha-bands at 549 and 553 nm in the dithionite-reduced state. A well-resolved midpoint potential (E<sup>0'</sup>) of -65 mV was determined for one haem by spectrophotometric titrations in the absence of dioxygen with dithionite and ferricyanide as reductant and oxidant, respectively. The midpoint potential of the second haem was not resolvable (E(0)' about -130 to -160 mV). One of the two haems was reduced by NADH (549 nm alpha-band), similar to bacterial dihaem peroxidases. Evidence for an electron transfer between the two haems was provided by slow reduction of the second haem (553 nm alpha-band) upon incubation of the partially reduced enzyme at room temperature. Addition of imidazole or related compounds to RoxA led to UV/vis spectral features similar to those observed for partially reduced RoxA. Notably, reduction of RoxA with dithionite or NADH, or binding of compounds such as imidazole, resulted in a reversible inactivation of the enzyme, unlike dihaem peroxidases. In line with this result, RoxA did not show any peroxidase activity. EPR spectra of RoxA as isolated showed two low-spin Fe(III) haem centres, with apparent g-values of 3.39, 3.09, 2.23, 1.92 and 1.50. A weak signal in the g=6 region resulting from a high-spin Fe(III) haem was also observed with a preparation-dependent intensity that disappeared in the presence of imidazole. Attempts to provide spectroscopic evidence for binding of the natural substrate (polyisoprene latex) to RoxA failed. However, experimental data are presented that RoxA is able to subtract redox equivalents from its substrate or from model compounds. In conclusion, RoxA is a novel type of dihaem dioxygenase with features clearly different from classical cytochrome c peroxidases. Kroneck, Peter M. H. Braaz, Reinhard Jendrossek, Dieter Kroneck, Peter M. H. 2017-01-05T10:14:57Z Spectroscopic properties of rubber oxygenase RoxA from Xanthomonas sp., a new type of dihaem dioxygenase 2010-08-02 Jendrossek, Dieter 2017-01-05T10:14:57Z Schmitt, Georg Seiffert, Grazyna Schmitt, Georg Seiffert, Grazyna

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