Nnamchi, CI and Parkin, G and Efimov, I and Basran, J and Kwon, H and Svistunenko, DA and Agirre, J and Okolo, BN and Moneke, A and Nwanguma, BC and Moody, PCE and Raven, EL (2016) Structural and spectroscopic characterisation of a heme peroxidase from sorghum. Journal of Biological Inorganic Chemistry, 21 (1). pp. 63-70. DOI https://doi.org/10.1007/s00775-015-1313-z
Nnamchi, CI and Parkin, G and Efimov, I and Basran, J and Kwon, H and Svistunenko, DA and Agirre, J and Okolo, BN and Moneke, A and Nwanguma, BC and Moody, PCE and Raven, EL (2016) Structural and spectroscopic characterisation of a heme peroxidase from sorghum. Journal of Biological Inorganic Chemistry, 21 (1). pp. 63-70. DOI https://doi.org/10.1007/s00775-015-1313-z
Nnamchi, CI and Parkin, G and Efimov, I and Basran, J and Kwon, H and Svistunenko, DA and Agirre, J and Okolo, BN and Moneke, A and Nwanguma, BC and Moody, PCE and Raven, EL (2016) Structural and spectroscopic characterisation of a heme peroxidase from sorghum. Journal of Biological Inorganic Chemistry, 21 (1). pp. 63-70. DOI https://doi.org/10.1007/s00775-015-1313-z
Abstract
A cationic class III peroxidase from Sorghum bicolor was purified to homogeneity. The enzyme contains a high-spin heme, as evidenced by UV?visible spectroscopy and EPR. Steady state oxidation of guaiacol was demonstrated and the enzyme was shown to have higher activity in the presence of calcium ions. A FeIII/FeII reduction potential of ?266 mV vs NHE was determined. Stopped-flow experiments with H2O2 showed formation of a typical peroxidase Compound I species, which converts to Compound II in the presence of calcium. A crystal structure of the enzyme is reported, the first for a sorghum peroxidase. The structure reveals an active site that is analogous to those for other class I heme peroxidase, and a substrate binding site (assigned as arising from binding of indole-3-acetic acid) at the ?-heme edge. Metal binding sites are observed in the structure on the distal (assigned as a Na+ ion) and proximal (assigned as a Ca2+) sides of the heme, which is consistent with the Ca2+-dependence of the steady state and pre-steady state kinetics. It is probably the case that the structural integrity (and, thus, the catalytic activity) of the sorghum enzyme is dependent on metal ion incorporation at these positions.
Item Type: | Article |
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Uncontrolled Keywords: | Heme; Porphyrin; X-ray crystallography; Sorghum; Peroxidase; Calcium |
Subjects: | Q Science > QD Chemistry |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 07 Apr 2016 12:01 |
Last Modified: | 23 Oct 2024 05:37 |
URI: | http://repository.essex.ac.uk/id/eprint/16382 |
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